DOCSLIB.ORG

Studies on the Kinetics of the Decomposition of Murexide in Acid

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Studies on the Kinetics of the Decomposition of Murexide in Acid STUDIE$ ON THE KINETICS OF THE DECOMPOSITION OF MUREXIDE IN ACID SOLUTIONS BY N. A. RAMAIAH, S. L. GUITA AND VISHNU (Department of Phy~lcal Chemiatry, Indlan Instituto of Sugar Technolog.v,'Kanpur) R.r March 5, 1956 (Communicatcd by K. S. G. Doss, V.A.Sc.) INTRODUCTION IN re~r ycars, murexido of ammonium salt of purpuric acid (D is being •xtcnsivcly uscd as ah analytical rcagcnt for many mctaUic ions, cspccially / OH o\ /~~ c\ q ~~\ O-,C C--N"C C-,,,O O 0 I of Ca~. Bcck1 r murexidc for the dctcction of So, Zn, Th and other raro carth and raro mctals; Lconid Kul'bcrg 2 us•d the sarao as rcagcnt for hcavy mr Schwarzenbach and Gysling ~ dcsc¡ in dota¡ tho uso of muroxidc for quantitativc cstimation of Cae. Sincc thcn it proved to bo an cf¡ rcagent for dotcnnination of calcium-contcnt in pharmaccutical products, 4 milk ultra filtrat~,4 etc. s Estimation with caso of Ca~" in sugar- cano julcr is problcmatical in sugar tcchnological laboratorios. Du¡ a se¡ of cxperimcnts on this invcstigation employing murexid•, a f•w intcrost- ing rcsults on the dccomposition of murexidc in acid solutions wcro obtained. It is known7. 8 that murexidc in solutions of low pH undergocs dccomposition lcading chicfly to tho production of uramil (II) and aUoxan (III). No data HN CO }IN ,,CO OCI CH,NH,I OCI COI II IIl in the litcraturc on the kinctics of this rcaction. The prcscnt co~muni= cation rr for the first time the kinctics of the dccomposition of murexidr 286 The Kinetics of the Decomposition of Murexide in Acid Solutions 287 investigated by employing the characteristic absorption spectra of the sub- staner in the visible region. EXI'Eg/ME/ql'AL The eommercial (B.D.H.) sample of murexide was purified by the method described by Davidson. s One grato of the crudo substance was dissolved in 900 c.e. of pure distilled water. The filtrat• was salted out with 60 gro. of ammonium chloride. The preeipitated substance was washed with absolute methyl alcohol, to be free from chlorido and later d¡ at 120 ~ C., when fine reddish brown crystals possessing a green reflex were obtained. Absorption spectra of a solution of known concentration of murexide with an equal volume of a buffer solution os desired pH, were studied with Unicam S.P. 350 D.G. spectrophotometer; this last had on• cm. effective light path. '~. .oif /~ ~~ / N ~o,t /j~.~ N :o.,1 //" "~\ 400 440 480 520 560 600 640 680 ra/el WAVE LENGTH FIo. 1. Absorption Spr of murr in the visibl9region. (Curvr 1 refr to the concentrar/on of 0"125 and Curvc 2, to 0.0625 mM of Murexide; pH = 6.0.) RESULTS ~ DIS~~JSSION A typical series of results on the characteristic absorption spectra of murexido in the rango 400 to 700 m/~ aro 8ivon in Flg, I; in this, curro I refers to a eoncr of 0. 125 mM while eurve 2, to 0.0625 mM of mur- exidc at pH ----- 6-0. It was interesting to note that the absorbancy of mur- exidc increased progressively to a maximum followed by a decrease with increas• in the wave-length. Thus, e.g., it was 0.35, 1.13 and 0.2 at ;~ = 460, A3 288 N. A. ~H A~ 620mp respectively. Murexide has maximum absorption at a = 530m/~ in accordance with the data obtained by other workers? Further, this wave- length ~ was unaffected by a change in the concentration or/and the pH value of the solution. At a fLxed pH, incraase of the concentration of the murexide solution especiaUy in the rango 10-a to 10-e M enhanced the maximum absorbancy. Thus, e.g., the absorbancy at ;~ = 530 m/~ was 0.17, 0.65 and I'. 13 at 0.016, 0-063 and 0.125 mM of murr Further, ir was interesting to note that the absorbancy increased sensibly linearly with the concentration (see Fig. 2) in accordance with Beer's law; the corresponding constant hada value of 1-04 • I0r at 25 ~ C. (Tabla I). |.2 O 0.8. ‰ 0.4_ ,,~ O ! nm | nu in O 0.4 0.8 1.2 x IO- CONCENTRATION OF MURE.XIDE FIo. 2. Variation of absorbancy with the concentration of murexide. (x = 530 m~ ; pH •, 6.0) The Kinetics of the Decomposition of Murexide in Acid ~olutions 289 T~Im I Variation of maximum absorbancy at A = 530m/z with concentration of Murexide Concentration Optical Beer's Constant M x 10 3 density (10"~) 0.125 1.135 0.91 0.10 1.03 1.03 0.0833 0-87 1.04 0.0625 0.655 I. 05 0.0417 0-44 1.06 0.0313 0.342 1.09 0.0157 0-171 1.09 Mean Value == 1.04 The data #ven in Figs. 3 and 4 represent the va¡ of the absorbancy at ~----530 m~ of murexide solution with time, at pH----2-2 and 2.6 res- pectively. In these curvcs 1 and 2 refer respectively to the above data with initial concentrations of 0-125 and 0.0625 mM of murexide. These data were obtained as follows: A known volume of the murexide solution was mixed with equrd volume of a buffer and the absorbancy was recorded at different intervals of time at ~ = 530 m~. It was interesting to observe that the absorbancy at ), = 530 m/z characte¡ of the substance decreased pro- gressivdy wit.h time. Thus for an initial concentration of 0.125 mM and at pH = 2-2, the optical density was 0.72, 0.42 and 0.22 at 1, 5 and 9 ruin. after the solution was mixed with the buffer. With further increase in time, it decreased to a negligibly small value (see Fig. 3). Essentially similar data were recorded at oth•r pH values (Fig. 4). The decrease with time of the absorbancy was accompanied by the gradual disappearance of the characteristic pink-red colour of the mdrexide. Furthermore, the above change in the absorpUon or the colour, appeared permanent and irreversible in the sense that when the acid-reacted solution was made alkaline, the charaeteristic colour was not restored, and the absorption at ~ = 530 m~ was not exhi- bited. This is illustrated clearly by the data given in Figs. 5 and 6; these refer to the expe¡ in whicix during the progress of the reaction, the 290 N. A. ~ ~'D oT~ O.9_ O.B 0.7 >06 U I £ , U'J m <0.3. 02 O'lI 6 IO 20 30 TIME IN MINUTES Fxo. 3. Decomposition of murexide with timo at pH -- 2.2. (Curve 1 ,= 0"125 and Curve 2 m 0.0625 mM of murexide ; ~. - .~30 m~) The Kinetics of the Decomposition of Murexide in Acid Solutions 291 1.0- _ 0.9. 0.8. 0.7 0.t~ ZO.5 eCO. 4 0 11) m 0.3. 0.2 0.1 C 0 I0 20 30 40 TIME IN MINUTES F1o. 4. Dr of murexidr with time at pH ffi 2.6. (Curvr 1 = 0-125 and Corvo 2 = 0"0625 mM of Murexid ~ =530 m~) pH of the solution has been increascd to 8 by addition of 0-2 c.c. of 4 N soclium hydroxide solution, which caused negligible dilution of the murexide solution. It was interesting to note that as soon as the pH was raised, the reaction leading to the decrease in the absorbancy of murexide was quenched as cvidenced by the observation that the absorbancy of the solution recorded 292 N. A. ~ ~ orma~ just before addition of alkali remained later sensibly constant (see Figs. 5 and 6). These data not only demonstrate the irreversible nature of the decomposition, but also reveal the marked dependence of the reaction on the hydrogen-ion concentration of the solution. !.0. 0.~ 0.8 0.~ 0.~ A ~0.5 co O0.4. LO ti3 <0.3. B O.2. O.I. O. 0 2 4. 6 8 I0 12 14 16 TIME IN MINUTES ]:lO. 5. Effect of addition of alkali to the acid reacted murexide ~olution. [[nitial pH of the solution = 2"2 (Curro B), pH after addition (at the instant indicatr by the arrow) of the alkali = 8-0 (Cm've A). ~ = 530 m~,.] The Kinetics of the Decomposition of Murexide in Acid Solutions 293 •O.8 ~)O.6. 0.~ 0,2 , .. , , 0 I0 20 30 4,0 TIME IN MINUTES FTO. 6. l~ffr of addition of alkali to the acid reactcd mur9 solution. [[nitia! pH of the solution ---- 2 "8 (Curve B), pH aftcr addition (at the in.~tant indicatcd by the a,'~row) of the alkali-- 8-0 (Curro A). ~ = 530 m#.] The data in Figs. 3 and 4 further show that larger the pH of the solu- tion, the greater is the timo necessary for complete decomposition of a known concentration of murexide. Thus the absorbancy at ~ ---- 530 m# decreased to undetectably smaU value within 25ruin. at pH = 2.2 (curro 1, Fig. 3), while the same at pH ---- 2.6 decreased to zero value by about 40 ruin. Table II gives the results on the time necessary for half decomposition ofa known initial concentration of murexide, recorded at different pH values. These were employed for the determination of the order (n) of the reaction under investigation. The figures in the last column gave an average value of 0-93 of ,~ 1 for n. Ir is for this reason that the authors considered the 294 N. A.
Load more

Recommended publications
  • In Presenting the Dissertation As a Partial Fulfillment of the Requirements for an Advanced Degree from the Georgia Institute Of
    In presenting the dissertation as a partial fulfillment of the requirements for an advanced degree from the Georgia Institute of Technology, I agree that the Library of the Institute shall make it available for inspection and circulation in accordance with its regulations governing materials of this type. I agree that permission to copy from, or to publish from, this dissertation may be granted by the professor under whose direction It was written, or, in his absence, by the Dean of the Graduate Division when such copying or publication is solely for scholarly purposes and does not involve potential financial gain. It is under­ stood that any copying from, or publication of, this dis­ sertation which involves potential financial gain will not be allowed without written permission. THE PHOTOMETRIC TITRATION AND EXTRACTIVE SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF NICKEL IN THE PRESENCE OF COBALT A THESIS Presented to The Faculty of the Graduate Division by Joe Allen Mann In Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the School of Chemistry Georgia Institute of Technology April, 1969 THE PHOTOMETRIC TITRATION AND EXTRACTIVE SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF NICKEL IN THE PRESENCE OF COBALT APPROVED: 1 / CHAIRMAN DATE APPROVED BY CHAIRMAN: iNI . M ii ACKNOWLEDGMENTS It is a pleasure to acknowledge my indebtedness to Dr. H. A, Flaschka for his guidance, inspiration,and friendship. His willingness to share his wide experience, vast knowledge, and keen insight has made an invaluable contribution to the accomplishment of this work and to the development of the author, Dr, Peter E.
    [Show full text]
  • NON-HAZARDOUS CHEMICALS May Be Disposed of Via Sanitary Sewer Or Solid Waste
    NON-HAZARDOUS CHEMICALS May Be Disposed Of Via Sanitary Sewer or Solid Waste (+)-A-TOCOPHEROL ACID SUCCINATE (+,-)-VERAPAMIL, HYDROCHLORIDE 1-AMINOANTHRAQUINONE 1-AMINO-1-CYCLOHEXANECARBOXYLIC ACID 1-BROMOOCTADECANE 1-CARBOXYNAPHTHALENE 1-DECENE 1-HYDROXYANTHRAQUINONE 1-METHYL-4-PHENYL-1,2,5,6-TETRAHYDROPYRIDINE HYDROCHLORIDE 1-NONENE 1-TETRADECENE 1-THIO-B-D-GLUCOSE 1-TRIDECENE 1-UNDECENE 2-ACETAMIDO-1-AZIDO-1,2-DIDEOXY-B-D-GLYCOPYRANOSE 2-ACETAMIDOACRYLIC ACID 2-AMINO-4-CHLOROBENZOTHIAZOLE 2-AMINO-2-(HYDROXY METHYL)-1,3-PROPONEDIOL 2-AMINOBENZOTHIAZOLE 2-AMINOIMIDAZOLE 2-AMINO-5-METHYLBENZENESULFONIC ACID 2-AMINOPURINE 2-ANILINOETHANOL 2-BUTENE-1,4-DIOL 2-CHLOROBENZYLALCOHOL 2-DEOXYCYTIDINE 5-MONOPHOSPHATE 2-DEOXY-D-GLUCOSE 2-DEOXY-D-RIBOSE 2'-DEOXYURIDINE 2'-DEOXYURIDINE 5'-MONOPHOSPHATE 2-HYDROETHYL ACETATE 2-HYDROXY-4-(METHYLTHIO)BUTYRIC ACID 2-METHYLFLUORENE 2-METHYL-2-THIOPSEUDOUREA SULFATE 2-MORPHOLINOETHANESULFONIC ACID 2-NAPHTHOIC ACID 2-OXYGLUTARIC ACID 2-PHENYLPROPIONIC ACID 2-PYRIDINEALDOXIME METHIODIDE 2-STEP CHEMISTRY STEP 1 PART D 2-STEP CHEMISTRY STEP 2 PART A 2-THIOLHISTIDINE 2-THIOPHENECARBOXYLIC ACID 2-THIOPHENECARBOXYLIC HYDRAZIDE 3-ACETYLINDOLE 3-AMINO-1,2,4-TRIAZINE 3-AMINO-L-TYROSINE DIHYDROCHLORIDE MONOHYDRATE 3-CARBETHOXY-2-PIPERIDONE 3-CHLOROCYCLOBUTANONE SOLUTION 3-CHLORO-2-NITROBENZOIC ACID 3-(DIETHYLAMINO)-7-[[P-(DIMETHYLAMINO)PHENYL]AZO]-5-PHENAZINIUM CHLORIDE 3-HYDROXYTROSINE 1 9/26/2005 NON-HAZARDOUS CHEMICALS May Be Disposed Of Via Sanitary Sewer or Solid Waste 3-HYDROXYTYRAMINE HYDROCHLORIDE 3-METHYL-1-PHENYL-2-PYRAZOLIN-5-ONE
    [Show full text]
  • Technical Method
    J Clin Pathol: first published as 10.1136/jcp.29.11.1038 on 1 November 1976. Downloaded from 1038 Technical method Technical method Simplified qualitative chemical the phosphate test: first add two drops of a 10%° ammonium hydroxide solution, one drop of 20 % analysis for urinary calculi nitric acid, and then two to three drops of the ammonium-molybdate reagent. Heating the J. KLEEBERG mixture will produce the characteristic yellow Research Department, Rothschild- UniversityHospital, colour ofammonium-molybdate-phosphate. Haifa, Israel The 'three glass slide' technique to be described here SLIDE II TEST FOR OXALATE is meant for qualitative stone analysis only and Two to three milligrams of stone powderismixedwith applies especially to small calculi. double the amount of resorcinol powder and 2 drops of concentrated sulphuric acid, and the mixture is Material and methods heated. The appearance of a deep blue (not green!) colour is proof of oxalate (Dorronsorro and Bi-distilled water; acetic acid 10%; hydrochloric Fernandez, cited by Higgins (1954)). If oxalate is acid 10%; nitric acid 20%; sulphuric acid conc; found, calcium must also be present. (Resorcinol and ammonium hydroxide solution 10%; sodium sulphuric acid produce coloured compounds with hydroxide solution 10 %; resorcinol powder; satura- dicarbonic acids (Feigl, 1956).) ted aqueous solution of ammonium-molybdate. Magneson reagent: 1 mg of nitro-phenyl-azo- SLIDE III TESTS FOR AMMONIA, CARBONATE, resorcinol is dissolved in 100 ml of 2-N-sodium MAGNESIUM AND CALCIUM hydroxide. (a) 2-3 mg of stone powder is moistened with 2 dropscopyright. of 10% hydrochloric acid, gently warmed, and SLIDE I TESTS FOR AMMONIUM URATE, URIC examined for bubbles with a magnifying glass: ACID, CYSTINE, XANTHINE, AND PHOSPHATE evidence ofcarbonate.
    [Show full text]
  • Ajax Finechem Product Catalogue 3510 585 6
    ACE AJAX FINECHEM PRODUCT CATALOGUE 3510 ACETONE, HPLC GRADE, BURDICK & JACKSON, CAT. AH010 Assay ……………………………………………………….. 99.9% min. Maximum limit of impurities (%) Water ……………………………………………………….. 0.5 Residue ……………………………………………………… 3mg/L Max. UV. Absorbance: λ(nm) 330 340 350 375 400 Absorbance 1.000 0.080 0.010 0.005 0.005 Pack Size: 4L 585 ACETONE, SPECTROSOL Description: clear liquid; characteristic odour. For U.V. spectroscopy. Assay (by GLC) ……………………………………………….. 99.5% min. Colour (APHA) …………………………………............ 10 max. Density (@ 25°C ) ……………………………………… 0.7857g/mL max. U.V absorbance λ(nm) 330 340 350 400 Max abs. 1.00 0.1 0.02 0.01 Maximum limit of impurities (%) R.A.E. ……………………………………………………….. 0.001 Sol. in H2O ………………………………………………… To pass test Titratable acid …………………………………………… 0.03 mmol H Titratable base ………………………………………….. 0.06 mmol OH Aldehyde (as HCHO) ………………………………….. 0.002 CH3OH ………………………………………………………. 0.05 Propan-2-ol ……………………………………………….. 0.05 Subs. red. KMnO4 (as O) …………………………….. 0.0005 H2O ………………………………………………………….. 0.5 Conforms to ACS Pack Size: 500mL 6 ACETONE, UNIVAR Description: clear liquid with a characteristic odour. Assay( by GLC) ………………………………………….. 99.5% min. Colour (APHA) …………………………………………… 10 max. Density (@ 25oC) ……………………………….......... 0.7857g/mL max. Maximum limit of impurities (%) R.A.E. ……………………………………………………….. 0.001 Cd …………………………………………………. 0.000005 Sol. in H2O …………………………………………………. To pass test Pb ………………………………………………….. 0.000005 Titratable acid ……………………………………………. 0.03 mmol H Ca………………………………………………….. 0.00005 Titratable base …………………………………………… 0.06 mmol OH Zn ………………………………………………….. 0.00005 Aldehyde (as HCHO) …………………………………… 0.002 Na …………………………………………………. 0.00005 Methanol, Propan-2-ol (each) ………………………. 0.05 K …………………………………………………….. 0.00005 Fe …………………………………………………………….. 0.00002 Cr…………………………………………………… 0.000002 Subs. red. KMnO4`……………………………………….. To pass test Co ………………………………………………….. 0.000002 H2O …………………………………………………………… 0.5 Cu ………………………………………………….. 0.000002 Al ……………………………………………………………… 0.00001 Mn ………………………………………………….
    [Show full text]
  • UNION CHRISTIAN COLLEGE Aluva- 683 102 (Affiliated to Mahatma Gandhi University, Kottayam) Ernakulam Dt
    Post Box: 5 UNION CHRISTIAN COLLEGE Aluva- 683 102 (Affiliated to Mahatma Gandhi University, Kottayam) Ernakulam Dt. Kerala Fax: 91-484- 2607534 Accredited by NAAC with “A” Grade, Cycle-4 91-484-2606033, 2609194 Email: [email protected] LIMITED TENDER NOTICE No. Department: Chemistry Sealed tenders are invited for the supply of the following Items: CHEMICALS ACETANILIDE ACETONE ACETONE COMML ACETOPHENONE ACETIC ACID GLACIAL ACID HYDROCHLORIC PURE ACID HYDROCHLORIC COMML ACID NITRIC COMML ACID NITRIC PURE ACID ORTHO- PHOSPHORIC ACID SULPHURIC COMML ACID SULPHURIC PURE AGAR AGAR ALCOHOL AMYL ISO – AMYL ALCOHOL ALUMINA (NEUTRAL) ALUMINIUM CHLORIDE ALUMINIUM NITRATE ALUMINIUM SULPHATE AMINO NAPHTHALENE- ALPHA AMINO PHENOL AMMONIA SOLUTION ER / AR AMMONIUM CARBONATE AMMONIUM ACETATE AMMONIUM BROMIDE AMMONIUM BORATE AMMONIUM CERIC SULPHATE AMMONIUM CERIC NITRATE AMMONIUM CHLORIDE AR AMMONIUM CHLORIDE PURE AMMONIUM CHLORIDE COMML AMMONIUM FORMATE AMMONIUM FLURIDE AMMONIUM NITRITE AMMONIUM NITRATE AMMONIUM NICKEL(II) SULPHATE AMMONIUM OXALATE AMMONIUM PURPURATE (MUREXIDE) AMMONIUM SULPHATE AMMONIUM SULPHIDE AMMONIUM IRON SULPHATE AMMONIUM FERROUS SULFATE AMMONIUM MOLYBDATE AMMONIUM IRON (II) SULPHATE 2-AMINO PYRIDINE Mohr's Salt AMMONIUM THIO CYNATE AMMONIUM THIOSULPHATE ANILINE ANISOLE PARA ANISALDEHYDE ANTHRACENE ANTHRANILIC ACID BARIUM CHLORIDE AR BARIUM CHLORIDE PURE BARIUM NITRATE BENZALDEHYDE BENZENE BENZOIC ACID BENZOIN BENZOPHENONE BENZIL BENZYL ALCOHOL BROMINE BIPHENYLE CALCIUM CHLORIDE (ANHYDROUS) CALCIUM FLURIDE CALCIUM HYDROXIDE CALCIUM
    [Show full text]
  • Inorganic Chemistry Practical
    EXPERIMENTAL INORGANIC CHEMISTRY For B.Sc. and M.Sc. Students As per new Syllabus Dr. M.K.Shah 2 Dedicated to all our beloved graduates & post graduate students 3 INORGANIC PREPARATION 4 1. TETRAMINE CUPRIC SULPHATE, [Cu(NH3)4 ]SO4H2O (A) REAGENTS Cupric sulphate, Ammonia, Ethyl alcohol, Nitric acid, Distilled water, Sulphuric acid. (B) REACTION CuSO45H2O(aq) + 4NH3(aq) [Cu (NH3)4]SO4H2O + 4H2O (C) PROCEDURE Take 5 gm crystalline cupric sulphate in a 250 ml beaker. Dissolve it in minimum quantity of water and then add few drops of diluted sulphuric acid. Add concentrated ammonia solution to the beaker with constant stirring, until the blue precipitate of cupric hydroxide, first formed completely dissolve to yield a clear, deep blue solution and there should be smell of ammonia in the beaker. Now add 20 ml alcohol dropwise from the dropping funnel to the beaker with constant stirring until the blue precipitates settled and clear solution is obtained. Heat it to 60o 70oC in the water bath for about 10-15 minutes. Then stop heating and remove the beaker from the water bath and allow it to stand. Long needle shaped blue crystals of tetramine cupric sulphate separates out. Filter and wash the crystals with a few drops of alcohol. Dry the crystals on a porous plate or in a desiccator. Weigh the dry crystal and find out the percentage yield followed by percentage purity by usual methods. 2. TRI (THIOUREA)-CUPROUS SULPHATE, [Cu (NH2CSNH2)3]2 SO4 2H2O] (A) REAGENTS Cupric sulphate, Ethyl alcohol, Nitric acid, Thiourea, Distilled water, Ammonia.
    [Show full text]
  • Analytical Reagents and Standards Pharmacopoeia Products
    Analytical Reagents and Standards The Experts in Custom-made Standards - Organic & Inorganic Pharmacopoeia products www.cpachem.com Contact us at: mobile: (+359) 886 796501 Tel./fax: (+359) 42 607716 E-mail: [email protected] products Standards/Pharmacopoeia and Reagents Analytical [email protected] ISO Guide 34 | ISO 17025 | ISO 9001 is the world leader in Certified Reference Materials production (Custom and Stock) with both ISO Guide 34 and ISO/IEC 17025 accreditations. The four secrets of our success are: ✓ High-technology ✓ High-experienced staff ✓ High-quality ✓ High-speed Our scope covers: Inorganic Certified Reference Materials (CRMs) for AAS, ICP, ICP/MS and Ion Chromatography - Custom Inorganic CRMs - Single and Multi-components - Inorganic stock CRMs - Single and Multi-components - ICP and ICP/MS Internal standards - AAS and ICP Modifiers, Buffers and Reagents - IC Eluent concentrates 1 Organic Certified Reference Materials (CRMs) for GC and HPLC - Custom Organic CRMs - Single and Multi-components - CRMs acc. to ISO, EN, ASTM and EPA Methods - Contaminant CRMs - Single Component CRMs Analytical Certified Reference Materials (CRMs) and Reagents - Custom Analytical CRMs - Volumetric CRMs - Conductivity CRMs - pH Buffer CRMs -Reagents Our unique Computer-Aided- What makes us different? Manufacturing (CAM) Software, that: - Surveys the stock availability and specifies the raw material to be purchased - Specifies the proper source and controls through bare-codes (complete traceability) - Calculates the needed weights and controls the gravimetric process on the analytical bal- ances - Evaluates the final data received by the in- strumental analyses and calculates the certi- fied values and uncertainties - Creates the labels and certificates - Controls the products intended to be export- ed and prints all accompanying documents.
    [Show full text]
  • IN SOUTHERN ARIZONA by Carroll J. Halva a Thesis Submitted To
    A geochemical investigation of "basalts" in southern Arizona Item Type text; Thesis-Reproduction (electronic) Authors Halva, Carroll Joe, 1938- Publisher The University of Arizona. Rights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. Download date 30/09/2021 09:11:23 Link to Item http://hdl.handle.net/10150/553953 A GEOCHEMICAL INVESTIGATION OF "BASALTS" IN SOUTHERN ARIZONA by Carroll J. Halva A Thesis Submitted to the Faculty of the DEPARTMENT OF GEOLOGY In Partial Fulfillment of the Requirements . For the Degree of MASTER OF SCIENCE In the Graduate College THE UNIVERSITY OF ARIZONA 1961 STATEMENT BY AUTHOR This thesis has been submitted in partial fulfillment of requirements for an advanced degree at The University of Arizona and is deposited in the University Library to be made available to borrowers under rules of the Library. Brief quotations from this thesis are allowable without special permission, provided that accurate acknowledgment of source is made. Requests of permission for extended quotation from or reproduction of this manuscript in whole or in part may be granted by the head of the major department or the Dean of the Graduate College when in their judgment the proposed use of the material is in the interests of scholarship. In all other instances, however, permission must be obtained from the author. SIGNED: APPROVAL BY THESIS DIRECTOR This Thesis has been approved on the date shown below: \ Paul E.
    [Show full text]
  • FCC 10, Second Supplement the Following Index Is for Convenience and Informational Use Only and Shall Not Be Used for Interpretive Purposes
    Index to FCC 10, Second Supplement The following Index is for convenience and informational use only and shall not be used for interpretive purposes. In addition to effective articles, this Index may also include items recently omitted from the FCC in the indicated Book or Supplement. The monographs and general tests and assay listed in this Index may reference other general test and assay specifications. The articles listed in this Index are not intended to be autonomous standards and should only be interpreted in the context of the entire FCC publication. For the most current version of the FCC please see the FCC Online. Second Supplement, FCC 10 Index / Allura Red AC / I-1 Index Titles of monographs are shown in the boldface type. A 2-Acetylpyrrole, 21 Alcohol, 90%, 1625 2-Acetyl Thiazole, 18 Alcohol, Absolute, 1624 Abbreviations, 7, 3779, 3827 Acetyl Valeryl, 608 Alcohol, Aldehyde-Free, 1625 Absolute Alcohol (Reagent), 5, 3777, Acetyl Value, 1510 Alcohol C-6, 626 3825 Achilleic Acid, 25 Alcohol C-8, 933 Acacia, 602 Acid (Reagent), 5, 3777, 3825 Alcohol C-9, 922 ªAccuracyº, Defined, 1641 Acid-Hydrolyzed Milk Protein, 22 Alcohol C-10, 390 Acesulfame K, 9 Acid-Hydrolyzed Proteins, 22 Alcohol C-11, 1328 Acesulfame Potassium, 9 Acid Calcium Phosphate, 240 Alcohol C-12, 738 Acetal, 10 Acid Hydrolysates of Proteins, 22 Alcohol C-16, 614 Acetaldehyde, 11 Acidic Sodium Aluminum Phosphate, Alcohol Content of Ethyl Oxyhydrate Acetaldehyde Diethyl Acetal, 10 1148 Flavor Chemicals (Other than Acetaldehyde Test Paper, 1636 Acidified Sodium Chlorite
    [Show full text]
  • Murexide Complex Was Determined Spectraphotometrically in Order to Calculate the Proper Blank Correction
    UNIVERSITY OF ALBERTA DETERMINATION OF SILVER@)IN THE PRESENCE SILVER(0) USING EDTA TITRATION ASHA PHILIPS ALEX 0 A thesis submitted to the Faculty of Graduate Studies and Research in partial Wfillment of the requirements for the degree of MASTER OF SCIENCE. DEPARTMENT OF CHEMISTRY Edmonton, Alberta Spring 1997 National Library BibliitMque nationale 1+1 ,a*, du Canada Acquisitions and Acquisitions et Bibliographic Sewices services bibliographiques 395 Wellington Street 335, rue Wdington OttawaON K1AW WONKlAW Canada Canada The author bas granted a non- L'auteur a accord6 melicence non exciusive licence dowing the exclusive pennettant a la National Library of Cauada to Bibliothkp nationale du Canada de reproduce, loan, distribute or sell reproduire, Mter, distciiiuer ou copies of hidher thesis by any means vendre des copies de sa thhe de and in any form or format, making this thesis available to interested forme qye ce soit pour mettre des persons. exemplaires de cette thtse a la disposition des personnes intQess6es. The author retains ownership of the L'auteur c<wserve la propritt6 du copyright in his/her thesis. Neither hit#auteur qui proege sa these. Ni the thesis nor substantial extra& la thbe ni des extraits substantiels de fiom it may be printed or otherwise cell-i ne doivent Stre imprimes ou reproduced with the author's autrement nptoduits sans son permission. ABSTRACT Silver coated materials have been well studied for their antimicrobial activities. The release of silver fiom silver coatings may be ia tbe form of elemental silver, silver oxide or silver chloride. To study the biological action of silver coatings a better understanding of different forms of siIver present in the solution is necessary.
    [Show full text]
  • Assistant Demonstrator in Biology at St Bartholomew's Medical School
    ON CERTAIN PROTEID AND ALBUMINOID RE- ACTIONS AND THEIR SIGNIFICANCE. BY JOHN W. PICKERING, B.Sc. (Lond.), Assistant Demonstrator in Biology at St Bartholomew's Medical School. (From the Physiological Laboratory of King's College, London.) THE experiments about to be described were begun with the object of determining if further modifications in the known tests for proteids would lead to distinctive reactions, and if possible to throw some light on the molecular groups upon whose existence, both the older reactions, and those about to be detailed depend. My paper can be divided into the following sections: I. That dealing with previous work. II. The reactions obtainable with salts of cobalt, nickel, and copper with proteids and albuminoids. III. The reactions of the same salts with certain proteid decompo- sition products, and allied substances. IV. Remarks on the significance of the previous observations. V. On the significance of the reactions associated with the names of Liebermann, Adamkiewicz, and Millon. VI. On the xanthoproteic reaction. VII. On the sulphomolybdic reaction. VIII. On the saliphonic reaction. IX. On certain alhuminoid reactions. X. On Krasser's alloxan reaction. XI. On certain reducing reactions. XII. On the reactions of proteid precipitates. XIII. Is there any molecular group associated with coagulation? XIV. Summary of results. PH. XIV. 25 348 J. W. PICKERING. I. Previous Work. Piotrowski' discovered that the addition of copper sulphate and caustic potash to a proteid gave a violet colour while "peptone" with the same reagents yielded a rose-red solution. G. Wiedemann2 found that biuret with these reagents gave a rose- red solution.
    [Show full text]
  • Kaeri/Tr-297/92
    m --K- I S* 'V/S U r * MI .1,-. ,r"* ^••^u.AW.t.n. *. 1 j./ •* 44 I y '» IS' V > -J- ^ *\*y* ARAB REPUBLIC OF EGYPT 1 /^/J' u ATOMIC ENERGY ESTABLISHMENT tic- S$\ t-. NEUTRON ;^0!H;^IQN^ALYSIS OP'URIflfc TAlCOETrun i We regret that some of the pages in the microfiche copy of this report may not be up to the proper legibility standards, even though the best possible copy was used for preparing the master fiche. A.n..l*.A.E.E./Rcp.-lC5 ARAB REPUBLIC OF EGYPT ATOMIC ENERGY ESTABLISHMENT NUCLEAR CHEMISTRY DEPARTMENT NEUTRON ACTIVATION ANALYSIS CF URINARY CALCULI By \\ SOUKA, S. SOUKA, M\ SANAU <ttid A.A. ABDEL-RASSOUL 1974 SCIENTIFIC INFORMATION DIVISION ATOMIC ENERGY POST OFFICE CAIRO, A.R.E. CONTENTS A B S T R A C T i INTRODUCTION , . 1 EXPERIMENTAL 2 RESULTS AND DISCUSSION 5 ACKNOM'IEDGEMTWT?? 10 APPENDIT 11 REFERENCES 14 NEUTKON ACTIVATION ANALYSIS Of U!UNAT>V CALCULI By N. SOUKA, S. SOUKA+, W. SANAD and A.A. ABT)EL-RASSOUL ABSTRACT Neutron activation analysis of u collection of urinary calculi has been undertaken,, Search for silver, selenium, zinc and cobalt -was carried out. Cobalt presented a measurable concentration in all the investigated calculi. The cobult content in oxalate stones (around 1200+93 ppn>)> was found to be approximately five times its value in phosphate stones (around 200+21 ppm). The cobalt content in the examined calcium oxalate- triple phosphate mixed calculi lies betireen both concentration levels. Clinical pathology Laboratory Sidnawy Health Ensurance Hospital, Cairo. IflEHODUCTlOfi Recently, several investigatore have shown that a defi­ nite relationship exists between the concentration level of several trace elements in human body and certain diseases.
    [Show full text]