DOCSLIB.ORG

Modelling for Removal of Cr (VI) and Pb (II) Using Sago Bark (Metroxylon

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Modelling for Removal of Cr (VI) and Pb (II) Using Sago Bark (Metroxylon 371 Egypt. J. Chem. Vol. 64, No. 8 pp. 3981 - 3989 (2021) Egyptian Journal of Chemistry http://ejchem.journals.ekb.eg/ Modelling for removal of Cr(VI) and Pb(II) using sago bark (Metroxylon sagu) by fixed-bed column method Syiffa Fauzia1, Hermansyah Aziz2, Dahyunir Dahlan3, Rahmiana Zein1* 1Laboratory of Analytical Environmental Chemistry, Department of Chemistry,Andalas University, 25163, Padang, Indonesia 2Laboratory of Physical Chemistry, Department of Chemistry, Andalas University, 25163, Padang, Indonesia 3Laboratory of Material and Structure, Department of Physics, Andalas University, Padang, 25163, Indonesia Abstract Industries commonly produced a large scale of wastewater that consisted of hazardous materials such heavy metals. Recently, one of popular methods for wastewater treatment was adsorption system using biosorbent. Sago bark (Metroxylon sagu) was a solid waste remained from sago starch industry. It contained various functional group such as carbonyl and hydroxyl groups that could be utilized to resolve wastewater containing metal ions. Removal of Cr(VI) and Pb(II) using sago bark (Metroxylon sagu) have been investigated by a fixed bed column reactor. The effect of flow rate (2, 4, 6 mL/min) and bed depth (3, 6, 9 cm) was examined in order to observe column performance (15x1 cm id). The result revealed that the lower flow rate and the higher bed depth delayed the breakthrough time and exhaustion time. Thus, the optimum conditions were achieved at 2 mL/min of flow rate and 9 cm of bed depth for both metal ions. The equation of Thomas, BDST and Yoon-Nelson models was carried out to evaluate the breakthrough curve. The repeatability and regeneration of sago bark were analyzed by HNO3 0.01 M within 3 cycles. It means that sago bark has a promising ability to remove Cr(VI) and Pb(II) ions in solution. Keywords: adsorption; column continuous; Cr(VI); Pb(II); sago bark 1. Introduction and other harmful diseases [3–5]. Considering its Industrial growth has been contributed to negative effect, various methods have been conducted environmental issue due to the generation of either to treat heavy metal wastewater so that it is feasible to liquid or solid waste as secondary product after be discharged to the environment. One of them is industrial processing. Approximately, 1.15 tons waste adsorption. Adsorption is an accumulation of produced were not processed in Indonesia [1]. compound in the liquid/gas phase on the solid surface. Recently, heavy metal waste has become a threat to the This method utilizes an adsorbent commonly come wide world. Heavy metal exposure is able to defect the from waste such as agricultural waste or biomass for environment, animals, and human. These heavy metals example pensi shell [6], Neplhelium lappaceum [7], enter the human body through the food chain, water or Macrocystis pyrifera and Undaria pinnatifida [8], other daily activities. Heavy metal such as lead Swietenia Mahogani fruit shells [9], oil palm fibre (Pb(II)) and chromium (Cr(VI)) is presented in various [10], immobilized citrus peels [11], residue allspice industries like tanning, mining, batteries, [12] and so forth. All of the adsorbent mentioned electroplating, paint and so forth [2]. Pb(II) gather in above own the advantages of adsorption method. It is the body and poison biological activities of living low cost, easy to prepare, no secondary waste, efficient organism that harm kidney, liver, and etcetera. for the low metal ion concentration, and simple [9, 12]. Whereas, chromium in Cr(VI) oxidation state is highly The adsorption of Cr(VI) and Pb(II) using sago bark soluble rather than Cr(III) oxidation state. Cr(VI) (Metroxilon sagu) has been performed by previous forms a hexavalent chromium ion that highly toxic due research employing the batch system [13, 14]. The to its mobility that causes a mutagenic, carcinogenic batch system provides information regarding the _________________________________________________________________________________________________ * Corresponding author: [email protected] or [email protected] Receive Date: 27 November 2019, Revise Date: 02 April 2020, Accept Date: 08 April 2021 DOI: 10.21608/EJCHEM.2020.20172.2212 ©2021 National Information and Documentation Center (NIDOC) 3982 Syiffa Fauzia, et.al. _____________________________________________________________________________________________________________ equilibrium and kinetic mechanism. Unfortunately, In the bottom of a column, glass wool was attached to this system is unable to be applied to industrial prevent adsorbent loss during adsorption. The metal purpose because the volume treated is constant/limited solution was pumped by a peristaltic pump. The giving lower driving force and the gradient effluent was collected every 5 minutes for an hour. concentration does not exist [5, 15]. Therefore, the Metal ion concentration was measured by AAS column system is required to evaluate the adsorbent (Atomic Absorption Spectrophotometer). The efficiency through the breakthrough curve shape. The breakthrough time and exhaustion time were observed breakthrough performance implies the probability of by plotting Ce/Co Vs time (breakthrough curve). Sago adsorbent for industrial application [8, 9, 12]. The bark was characterized by FTIR (Fourier Transform previous research utilized stem tree of soybean to Infra-Red), SEM (Scanning Electron Microscopy), remove Pb(II) and Zn(II) has applied optimum and BET (Bruener Emmet-Teller). condition that was obtained from batch system in continuous flow system. The adsorption capacity for Column adsorption data modelling both Pb(II) and Zn(II) was 12.44 mg/g and 6.75 mg/g, Thomas model respectively [16]. Beside, sago bark was a solid waste The linearization of the Thomas model was derived by from sago starch industry which generated about 1.5 C plotting ln ( o − 1)vs t. Thomas model stated that the tons waste per day [17]. Therefore, it becomes a Ct concern to overcome this problem as well. The adsorption process was reversible based on the purpose of the present research is to investigate the second-order kinetic model with no axial dispersion efficiency of sago bark for Cr(VI) and Pb(II) removal [5, 18]. This model was represented by the following in fixed bed column. Some parameters are subjected to equation: C k q m evaluate the adsorbent performance such as flow rate ln ( o − 1) = TH o and bed depth. The breakthrough curve is described by Ct Q Thomas, BDST and Yoon-Nelson models. − kTHCot Equation (1) Where Co and Ct were initial concentration and 2. Experimental Section concentration of metal ion (mg/L) at the time (t). kTH was Thomas model constant (L/mg.min). qo and m Material and Adsorbent preparation were maximum adsorption (mg/g) and adsorbent mass Pb(II) and Cr(VI) solution were prepared by (g), respectively. Meanwhile, Q was flow rate dissolving Pb(NO3)2 and K2Cr2O7 in distilled water. (mL/min). NaOH or HCl was used to adjust solution pH. HNO3 Yoon-Nelson was employed as chemical activator of adsorbent and This model gave information regarding the time glass wool. All the reagents were analytical grade required for 50 % breakthrough. This model was purchased by Merk, Germany. Sago bark (Metroxylon simple due to no detailed parameters needed. The sagu) was collected from the local area, West Sumatra, Yoon-Nelson model was expressed by the given Indonesia. The sample was washed to remove dirt and equation: then sundried. Dried sago bark was crushed to get fine Co ln ( ) = kYNt − kYN Equation (2) size <160 µm. Sago bark powder was soaked in 0.01 Co − Ct -1 M HNO3 for an hour. Then, filtered and rinsed with Where kYN and were Yoon-Nelson constant (min ) distilled water until neutral pH. The powder was and time required at 50 % of breakthrough (min) [18, sundried to remove water. 19]. Fixed bed column procedure BDST (Bed depth service time) The fixed-bed column was carried out in a glass BDST model can be employed to the adsorption column (15 cm length and 1 cm inner diameter). Some process without further experiment. It can predict the parameters were studied to evaluate fixed-bed column service time of adsorbent before it has to be performance such as flow rate (2, 4, 6 mL/min), regeneration or replaced, the ability of adsorbent to adsorbent mass (0.5;1;1.5 g), and adsorption- adsorb the certain amount of adsorbate [5, 18]. The desorption cycles. pH and initial concentration of relationship of each parameter was determined by the metal ions have been studied in the batch system. following equat nion: These optimum conditions were employed to evaluate NoZ 1 C0 the ability of sago bark in column system since t = − ln [ − 1] Equation (3) Cou KaCo Cb dynamic system more practical in industry. Optimum conditions of Cr(VI) in the batch system were Where No and Z were bed adsorption capacity (mg/L) achieved at pH 3 and 1000 mg/L of Cr(VI) and bed height (cm), respectively. Ka was BDST concentration [14]. Whereas Pb(II) reached the peak at model rate constant (L/mg/min), u was the linear pH 5 and 800 mg/L of Pb(II) concentration [13]. ________________________________________________ Egypt. J. Chem. 64, No. 8 (2021) MODELLING FOR REMOVAL OF Cr(VI) AND Pb(II) USING SAGO BARK.. 3983 __________________________________________________________________________________________________________________ velocity (cm/min), t was service time (min) and Cb was properties as well such as the electronegativity, ionic the concentration at the breakthrough (mg/L). radii, hydrated ion radii and so forth. These metal properties were contributed to the interaction between 3. Results And Discussion an adsorbent and metal ion either physical or chemical sorption [2, 13, 14, 23]. Adsorbent characterization The bark surface is observed by FTIR and SEM. Flow rate effect Effect of flow rate was carried out based on optimum FTIR spectra give spectra of functional groups condition obtain in a batch system (pH 3, initial existing in sago bark.
Load more

Recommended publications
  • Genetic Variation and Agronomic Features of Metroxylon Palms in Asia and Pacific
    Chapter 4 Genetic Variation and Agronomic Features of Metroxylon Palms in Asia and Pacific Hiroshi Ehara Abstract Fourteen genera among three subfamilies in the Arecaceae family are known to produce starch in the trunk. The genus Metroxylon is the most productive among them and is classified into section Metroxylon including only one species, M. sagu (sago palm: called the true sago palm), distributed in Southeast Asia and Melanesia and section Coelococcus consisting of M. amicarum in Micronesia, M. salomonense and M. vitiense in Melanesia, M. warburgii in Melanesia and Polynesia, and M. paulcoxii in Polynesia. In sago palm, a relationship between the genetic distance and geographical distribution of populations was found as the result of a random amplified polymorphic DNA analysis. A smaller genetic variation of sago palm in the western part than in the eastern part of the Malay Archipelago was also found, which indicated that the more genetically varied populations are distributed in the eastern area and are possibly divided into four broad groups. Metroxylon warburgii has a smaller trunk than sago palm, but the trunk length of M. salomonense, M. vitiense, and M. amicarum is comparable to or longer than that of sago palm. Their leaves are important as building and houseware material, and the hard endosperm of M. amicarum and M. warburgii seeds is utilized as craftwork material. Preemergent young leaves around the growing point of M. vitiense are utilized as a vegetable. Regarding starch yield, palms in Coelococcus are all low in the dry matter and pith starch content as compared with sago palm. For this reason, M.
    [Show full text]
  • Hiroshi Ehara · Yukio Toyoda Dennis V. Johnson Editors
    Hiroshi Ehara · Yukio Toyoda Dennis V. Johnson Editors Sago Palm Multiple Contributions to Food Security and Sustainable Livelihoods Sago Palm Hiroshi Ehara • Yukio Toyoda Dennis V. Johnson Editors Sago Palm Multiple Contributions to Food Security and Sustainable Livelihoods Editors Hiroshi Ehara Yukio Toyoda Applied Social System Institute of Asia; College of Tourism International Cooperation Center for Rikkyo University Agricultural Education Niiza, Saitama, Japan Nagoya University Nagoya, Japan Dennis V. Johnson Cincinnati, OH, USA ISBN 978-981-10-5268-2 ISBN 978-981-10-5269-9 (eBook) https://doi.org/10.1007/978-981-10-5269-9 Library of Congress Control Number: 2017954957 © The Editor(s) (if applicable) and The Author(s) 2018, corrected publication 2018. This book is an open access publication. Open Access This book is licensed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made. The images or other third party material in this book are included in the book’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the book’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. The use of general descriptive names, registered names, trademarks, service marks, etc.
    [Show full text]
  • V30n4p165-180
    19861 RAUWERDINK:METROXYLON Principes,30(4), 1986, pp. 165-180 An Essay on Metroxylon, the Sago Palm JeNB. ReuwnRomx Department of Plant Taxonomy, Agricultural Uniaersity, Wageningen, the Netherlands P.O. Box 8010, 6700 ED Wageningen Metroxylon is a genus of arborescent under cultivation. The aim of my survey palms of Papuasia and several island and the present paper has been to report groups of Micronesia and Melanesia. There on the variability of M. sagu in PNG, in are five species occurring in five separate the context of the diversity found in the areas. The most widespread taxon, M. genus as a whole. This paper may con- scLgu, covers Malaysia, Indonesia, Min- tribute towards an eventual monograph of danao, and New Guinea. The other four Metroxylon. taxa are endemic to the aforementioned island groups. Historyof the Genus The palms accumulate starch in the pith of their trunks and are a traditional source The first and most competentpublica- of carbohydrate. The best known r-epre- tion on sagopalms is by Rumphius(1741). sentative of the genus in this respect is In the Herbarium Amboinensehe gives M. sagu, known as the sago palm. This a meticulousdescription of the sagopalm species occupies the largest area. esti- as it occurs in Ambon. and he Dresents mated to cover 4 million ha in natural the taxonomic views of the inhabiiants on stands and about .2 million ha under cul- this palm. Four Ambonesespecies are tivation. With the exception of M. salo- described under the seneric name of monense.the other tp".i"t of Melroxylon Sagris.This namewas adopted by Caert- are not exploited for their starch content.
    [Show full text]
  • 5 Pacific Ocean Region
    Tropical Palms 107 5 PACIFIC OCEAN REGION This chapter considers the islands of the Pacific Ocean which are geographically divided into Micronesia, Melanesia and Polynesia. Micronesia delimits islands in the western Pacific and consists of the Mariana, Palau, Caroline, Marshall and Gilbert island groups. Melanesia lies to the northeast of Australia and includes New Caledonia, Vanuatu, Solomon Islands and Fiji. Polynesia designates the islands of the central Pacific, including Samoa (Western and American), French Polynesia (Marquesas, Society Islands, etc.) and Tonga. Papua New Guinea is also included within the scope of this chapter; politically the nation of Papua New Guinea consists of the eastern portion of the island of New Guinea and the Bismarck Archipelago as well as Bougainville. The following geographic areas where palms occur are excluded from discussion in this chapter and this report: The Hawaiian Islands; New Zealand, including the Kermadec Islands; Australia and its island territories (e.g. Lord Howe, Norfolk, Christmas and Cocos); and the Bonin and Ryukyu Islands belonging to Japan. The Pacific Ocean Region presents some very unusual patterns of native palm diversity. In the entire area of Micronesia there are only about ten species of native palms (Moore and Fosberg, 1956). The situation in Polynesia is comparable. In marked contrast Melanesia has much greater native palm diversity. For example, New Caledonia alone has 37 indigenous palm species, all endemic (Hodel and Pintaud, 1998; Moore and Uhl, 1984) and Vanuatu has 21 native palms (Dowe and Cabalion, 1996). Papua New Guinea and its islands hold a very rich diversity of palms, with about 270 native species in 31 genera (Baker and Dransfield, 2006; Essig, 1995; Hay, 1984).
    [Show full text]
  • Tropical Sources of Starches -.:: GEOCITIES.Ws
    Tropical Sources of Starches S.N. Moorthy Central Tuber Crops Research Institute, Sreekariam, Thiruvananthapuram, India 1 Introduction The tropical belt which covers around 40% of the total land area encompassing five continents and many countries harbour a number of starch bearing crops which include cereals, tree, fruit and vegetable crops and most important the root crops [1-8]. However commercial use of these for starch extraction has been limited to a few of these crops. Most important of them are sago starch from sago palm, potato, cassava and sweet potato starches from the corresponding tubers. Minor quantities of starch are extracted from other crops such as Palmyra fruits, and the tuber crops like colocasia, amorphophallus, yams, arrowroot, Canna and Curcuma sp. but they have no commercial importance. Among these different starches, only cassava and sweet potato starches have been studied in detail and this chapter tries to bring out the available information on the tropical starches and also possible avenues of utilisation based on their physicochemical and functional characteristics. The starches and their properties are dealt with under different sections 1.1 Tree Crops. Among the starch bearing tree crops, the most important ones are sago palm, mango, Plantain, jackfruit , breadfruit and Pandanus. The starch is found either in the stem, fruit or seed. 1.1.1. Sago palm (Metroxylon sagu) is a nonbranching palm cultivated in SE Asia. It grows to 9-12 metres high and flowers after 10-15 years and then dies. At the time of flowering, the palms are felled, the stems are sliced the pith is rasped, sieved and the starch granules are allowed to settle.
    [Show full text]
  • Study on Measurement and Determination Carbon Pool in Traditional Agroforestry System for Handling Climate Change
    International Journal of Forestry and Horticulture (IJFH) Volume 4, Issue 2, 2018, PP 14-24 ISSN No. (Online) 2454–9487 DOI: http://dx.doi.org/10.20431/2454-9487.0402003 www.arcjournals.org Study on Measurement and Determination Carbon Pool in Traditional Agroforestry System for Handling Climate Change Jan Willem Hatulesila1, Cornelia M.A.Wattimena1, Ludia Siahaya1 1Forestry Department, Faculty of Agriculture, Pattimura University *Corresponding Author: Jan Willem Hatulesila, Forestry Department, Faculty of Agriculture, Pattimura University. Abstract: The forest that is the lungs of the world plays a very important role in the continuity of life on earth. Forests absorb Co2 during the process of photosynthesis and decomposition as organic matter in plant biomass. Measurement of forest productivity by biomass measurement. Forest biomass provides important information in the predicted potential of Co2 and biomass sequestration in certain ages that can be used to estimate forest productivity. This research was conducted in the community forest of Hutumuri village as one of traditional agroforestry “dusung” in Ambon Island. Beside that data base can serve as a planner base for the development of large-scale forecasts of carbon stocks for total community forest of agroforestry patterns. The carbon measurement method is done in demonstration plot for tree, sapling and forest floor level. The results show the dominant plant species for plot I in the dominance of nutmeg (Myristica fragrans), plot II durian (Durio zibethinus) and plot III duku (Lansium spp). The total measured biomass on tree vegetation was 58.52 tC / ha; forest floor was 1.71 tC / ha; top soil layer was 13 tC / ha, woody necromass was 33.56 kg 2 / m ; rough and soft litter were 1.84 tC / ha, necromass was 67.16 tC / ha.
    [Show full text]
  • Structure and Processes in Traditional Forest Gardens of Central Sulawesi, Indonesia
    Frank Brodbeck (Autor) Structure and Processes in Traditional Forest Gardens of Central Sulawesi, Indonesia https://cuvillier.de/de/shop/publications/2985 Copyright: Cuvillier Verlag, Inhaberin Annette Jentzsch-Cuvillier, Nonnenstieg 8, 37075 Göttingen, Germany Telefon: +49 (0)551 54724-0, E-Mail: [email protected], Website: https://cuvillier.de 1 1 Introduction and basic conditions 1.1 Problem statement According to the latest figures of the FAO (2003), the decline of the forest areas in tropical regions averaged 12.3 million ha per year in the period from 1990 to 2000. In Indonesia alone, the loss of forests amounted to 1.3 m ha or 1.2% of the total forest area per year in the same period. Between 1985 and 1997 Sulawesi lost 20% of its natural forest cover (Holmes 2000). One of the major causes for the decline of forest areas is the conversion of forest into other forms of land use, e.g. agriculture. On the other hand, huge areas of land in Indonesia are unproductive, e.g. Imperata grassland or degraded secondary forests. Agroforestry systems are an option to bring such unproductive land back under cultivation and thus also take the pressure from natural forests. Forest gardens, as one example of an agroforestry system, also offer an alternative to the conversion of forests by combining agricultural use with the preservation of a forest- like character. While agroforestry did not start to become popular until a few years ago, forest gardens have a long tradition in Sulawesi. The famous natural scientist Alfred Russels Wallace described forest gardens on his visit to Celebes (former name for Sulawesi) in 1856: “Some of the villages […] are scattered about in woody ground, which has once been virgin forest, but of which the constituent trees have been for the most part replaced by fruit trees, and particularly by the large palm, Arenga saccharifera, from which wine and sugar are made” (WALLACE 2000).
    [Show full text]
  • Tree Diversity and Its Use by Local Communities in Buol District, Indonesia
    Tree diversity and its use by local communities in Buol District, Indonesia Subekti Rahayu, Betha Lusiana, Sacha Amaruzaman, Dienda Citasyari Hendrawan dan Sidiq Pambudi Tree diversity and its use by local communities in Buol District, Indonesia Subekti Rahayu, Betha Lusiana, Sacha Amaruzaman, Dienda Citasyari Putri Hendrawan and Sidiq Pambudi Working paper no. 212 LIMITED CIRCULATION Citation: Rahayu S, Lusiana B, Amaruzaman S, Hendrawan DC, Pambudi S. 2015. Tree diversity and its use in Buol District, Indonesia. Working Paper 212. Bogor, Indonesia: World Agroforestry Centre (ICRAF) Southeast Asia Regional Program. DOI: http://dx.doi.org/10.5716/WP15723.PDF Titles in the Working Paper Series aim to disseminate interim results on agroforestry research and practices and stimulate feedback from the scientific community. Other publication series from the World Agroforestry Centre include: agroforestry perspectives, technical manuals and occasional papers. Published by the World Agroforestry Centre (ICRAF) Southeast Asia Regional Program PO Box 161, Bogor 16001 Indonesia Tel: +62 251 8625415 Fax: +62 251 8625416 Email: [email protected] Website: http://www.worldagroforestry.org/regions/southeast_asia © World Agroforestry Centre 2015 Working Paper no. 212 Disclaimer and copyright The views expressed in this publication are those of the author(s) and not necessarily those of the World Agroforestry Centre. Articles appearing in this publication may be quoted or reproduced without charge, provided the source is acknowledged. All images remain the sole property of their source and may not be used for any purpose without written permission of the source. About the authors Subekti Rahayu is a biodiversity and carbon stock specialist at the World Agroforestry Centre.
    [Show full text]
  • CB-NRM Technical Manual Vol
    CB-NRM Technical Manual Vol. 3: Income Generating/Livelihood Development Prepared by The Project for Community-Based Sustainable Natural Resource Management in the Democratic Republic of Timor-Leste Project for Community-Based Sustainable Natural Resource Management in the Democratic Republic of Timor-Leste CB-NRM Technical Manual Vol. 3: Income Generating / Livelihood Development Table of Contents page Chapter 1 Introduction ............................................................................................ 1 1.1 Rationale for the Techniques................................................................................ 1 1.2 Objectives of the Techniques ............................................................................... 1 1.3 Objectives of the Manual ..................................................................................... 1 Chapter 2 Approaches to Effective Transferring of Techniques ......................... 2 2.1 Hands-on Training and Follow-up On-the Job Training (OJT) ........................... 2 2.2 Resource-Based ................................................................................................... 3 2.3 Participatory ......................................................................................................... 3 2.4 Women Centric .................................................................................................... 3 2.5 Continuous Coaching ........................................................................................... 3 2.6 Framework to Transfer
    [Show full text]
  • Bark Ash to Improve Phosphorus Availability in Acidic Soils
    agronomy Article Optimisation of Charcoal and Sago (Metroxylon sagu) Bark Ash to Improve Phosphorus Availability in Acidic Soils Prisca Divra Johan 1, Osumanu Haruna Ahmed 1,2,3,*, Ali Maru 4, Latifah Omar 1,2 and Nur Aainaa Hasbullah 5 1 Department of Crop Science, Faculty of Agricultural Science and Forestry, Bintulu Sarawak Campus, Universiti Putra Malaysia, Bintulu 97008, Malaysia; [email protected] (P.D.J.); [email protected] (L.O.) 2 Institute Ekosains Borneo (IEB), Faculty of Agriculture and Forestry Sciences, Bintulu Sarawak Campus, Universiti Putra Malaysia, Bintulu 97008, Malaysia 3 Institute of Tropical Agriculture, Universiti Putra Malaysia (ITAFoS), Seri Kembangan 43000, Malaysia 4 School of Agriculture, SIREC, CBAS, University of Ghana, Legon, Accra 23321, Ghana; [email protected] 5 Faculty of Sustainable Agriculture, Sandakan Campus, Universiti Malaysia Sabah, Sandakan 90509, Malaysia; [email protected] * Correspondence: [email protected]; Tel.: +60-19-3695095 Abstract: Soil acidity is an important soil factor affecting crop growth and development. This ultimately limits crop productivity and the profitability of farmers. Soil acidity increases the toxicity of Al, Fe, H, and Mn. The abundance of Al and Fe ions in weathered soils has been implicated in P fixation. To date, limited research has attempted to unravel the use of charcoal with the incorporation of sago (Metroxylon sagu) bark ash to reduce P fixation. Therefore, an incubation study was conducted in the Soil Science Laboratory of Universiti Putra Malaysia Bintulu Sarawak Campus, Malaysia for 90 days to determine the optimum amounts of charcoal and sago bark ash that could be used to improve the P availability of a mineral acidic soil.
    [Show full text]
  • Implications of Embryo Desiccation Tolerance, Seed Dormancy
    IMPLICATIONS OF EMBRYO DESICCATION TOLERANCE, SEED DORMANCY, AND SEED DAMAGE FOR CONSERVATION OF PRITCHARDIA PALMS ENDEMIC TO HA WAIT A DISSERTATION SUBMITTED TO THE GRADUATE DIVISION OF THE UNIVERSITY OF HA WAIT IN PARTIAL FULLFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY IN TROPICAL PLANT AND SOIL SCIENCES (ECOLOGY, EVOLUTION, AND CONSERVATION BIOLOGY) MAY 2006 By: Hector E. Perez Dissertation Committee: Richard Criley, Chairperson Kent Kobayahsi Carol Baskin Mike Maunder Christina Walters Donald Drake DEDICATION This dissertation is dedicated to the memory of Amparo Claramunt. Her blessings allowed me to pursue my ambitions. Ill ACKNOWLEDGMENTS I would like to thank the National Science Foundation Grades K-12 Teaching Fellowship Program; the Ecology, Evolution, and Conservation interdisciplinary specialization; the ARCS Foundation; and the Haruyuki Kamemoto Scholarship for funding for my research and academic endeavors, I am thankful to all my committee members for their mentoring and support during my studies. I am grateful for the invaluable technical and logistical support provided by Lisa Hill, Jennifer Crane, and John Waddell of the National Center for Germplasm Preservation Research (USDA- ARS, Ft. Collins, CO). I thank Drs. Nancy Chen, Sung-Eun Lee, Qingxiao Li, Loren Gautz, Robert Pauli, Yoneo Sagawa, and David Webb, and Tina Carvalho for their technical assistance, use of lab space, and equipment. The Army Natural Resources, Environmental Division, Conservation and Restoration Branch also provided logistical support for preliminary studies. 1 express my gratitude to Mr. Alvin Yoshinaga for all his help and hospitality. 1 thank my family and friends for all the love and support they provided, whether local or long-distance.
    [Show full text]
  • SAGO PALM Hiroshi Ehara · Yukio Toyoda Dennis V
    EDITORS. HIROSHI EHARA, YUKIO TOYODA, DENNIS V. JOHNSON SAGO PALM Hiroshi Ehara · Yukio Toyoda Dennis V. Johnson Editors Sago Palm Multiple Contributions to Food Security and Sustainable Livelihoods Sago Palm Hiroshi Ehara • Yukio Toyoda Dennis V. Johnson Editors Sago Palm Multiple Contributions to Food Security and Sustainable Livelihoods Editors Hiroshi Ehara Yukio Toyoda Applied Social System Institute of Asia, College of Tourism International Cooperation Center for Rikkyo University Agricultural Education Niiza, Saitama, Japan Nagoya University Nagoya, Japan Dennis V. Johnson Cincinnati, OH, USA ISBN 978-981-10-5268-2 ISBN 978-981-10-5269-9 (eBook) https://doi.org/10.1007/978-981-10-5269-9 Library of Congress Control Number: 2017954957 © The Editor(s) (if applicable) and The Author(s) 2018. This book is an open access publication. Open Access This book is licensed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made. The images or other third party material in this book are included in the book’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the book’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
    [Show full text]