ISSN: 0195-5373 e-ISSN: 2708-521X Vol . 42 No. 1 Jan/Feb. 2021 www.at-spectrosc.com Cover Feature: Jinhua Li, Rui Pei, Fangfang Teng, Hao Qiu, Roald Tagle, Qiqi Yan, Qiang Wang, Xuelei Chu , and Xing Xu Micro- XRF Study of the T roodontid Dinosaur Jianianhualong tengi Reveals New Biological and Taphonomical Signals Journal Overview The Atomic Spectroscopy (Print ISSN 0195−5373; Online ISSN 2708-521X) is a peer-reviewed international journal started in 1962 by Dr. Walter Slavin. It is dedicated to advancing the analytical methodology & applications, instrumentation & fundamentals, and the science of reference materials in the fields of atomic spectroscopy. Publishing frequency: Six issues per year. 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Zhi Xing (Tsinghua University, China) CAS, China) In This Issue: Micro-XRF Study of the Troodontid Dinosaur Jianianhualong tengi Reveals New Biological and Taphonomical Signals # Jinhua Li, Rui Pei, Fangfang Teng, Hao Qiu,e Roald Tagle, Qiqi Yan, Qiang Wang, Xuelei Chu, and Xing Xu......................................................................................................1 Excitation Behavior of Copper Ionic Emission Lines During the 3d94p - 3d94s Transition in the Glow Discharge Plasma with Xenon in Comparison to Using Argon and Krypton Kazuaki Wagatsuma..................................................................................................................................12 Spark Discharge-LIBS: Evaluation of One-Point and Multi-Voltage Calibration for P and Al Determination Alan Lima Vieira, Edilene Cristina Ferreira, Dário Santos Júnior, Giorgio Saverio Senesi, and José Anchieta Gomes Neto.......................................................................18 Determination of Elemental Impurities in Iron-nickel-based Superalloys by Glow Discharge Mass Spectrometry F. F. Hu, C. H. Wang, J. D. Li, P. Y. Liu, H. Liu, and L. Zhang..........................................................25 Leaching of Gallium from Coal Fly Ash, Alumina and Sediment Samples with an Acid Mixture for its Determination by ICP-OES A. C. Sahayam, G. Venkateswarlu, and S. Thangavel........................................................................32 Influence of Spot Size on LA-ICP-MS Ablation Behavior for Synthetic Calcium Tungstate and Silicate Glass Reference Material NIST SRM 610 Yuting Xiao, Jian Yang, Jun Deng, Wei Wang, Yuqiu Ke, and Yijian Sun.....................................36 # Front Cover Article ISSN 0195-5373/e-ISSN 2708-521X; CODEN ASPND7 JAN/FEB. 2021 42(1), 1-42. www.at-spectrosc.com Micro-XRF Study of the Troodontid Dinosaur Jianianhualong tengi Reveals New Biological and Taphonomical Signals Jinhua Li,a,b,† Rui Pei,c,d,e,† Fangfang Teng,f Hao Qiu,a Roald Tagle,g Qiqi Yan,g Qiang Wang,c,d Xuelei Chu,a and Xing Xuc,d,* a Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, P. R. China b Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, P. R. China c Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, P. R. China d CAS Center for Excellence in Life and Paleoenvironment, Beijing 100044, P. R. China e State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, P. R. China f Xinghai Paleontological Museum of Dalian, Dalian 116023, Liaoning, P. R. China g Bruker Nano GmbH, Am Studio 2D, 12489 Berlin, Germany Received: November 15, 2020; Revised: November 28, 2020; Accepted: November 28, 2020; Available online: December 01, 2020. DOI: 10.46770/AS.2021.01.001 ABSTRACT: Jianianhualong tengi is a key taxon for understanding the evolution of pennaceous feathers as well as of troodontid theropods. It is known by only the holotype, which was recovered from the Lower Cretaceous Yixian Formation of western Liaoning, China. In this study, we carried out a large-area micro-X-Ray fluorescence (micro-XRF) analysis of the holotype of Jianianhualong tengi via a Brucker M6 Jetstream mobile XRF scanner. The elemental distribution measurements of the specimen show an enrichment of typical bone-associated elements, such as S, P and Ca, which allows to visualize the fossil structure. Additionally, the bones are enriched with several heavier elements, such as Sr, Th, Y and Ce relative to the surrounding rocks. The enrichment is most likely associated to secondary mineralization and the phosphates from the bones. Interestingly, the plumage shape correlates with an enrichment in elements, such as Cu, Ni and Ti, consistent with the findings of a previous study1 on Archaeopteryx using synchrotron imaging. Elemental variations among the skeleton, the unguis and the sheath blade further indicate their possible compositional or ultrastructural differences, providing new biological and taphonomic information on the fossilized keratinous structures. An in-situ and nondestructive micro-XRF analysis is currently the most ideal way to map the chemistry of meter-sized fossils and has so far been mainly restricted to small samples. Micro-spatial chemical analysis of larger samples usually required a synchrotron facility. Our study demonstrated that a laboratory-based large-area micro-XRF scanner can provide a practical tool for the study of large specimens, thus allowing to collect full chemical data in order to obtain a better understanding of evolutionary and taphonomic processes. INTRODUCTION feathers and bones, and bring our understanding of this major transition to a new level.1, 5-12 The chemistry of exquisitely Morphological studies on the skeleton and the plumage have preserved