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WANG He-ling,LI Guang-yi,QU Shao-peng,QIAN Yu-ping,QIU Xiu-mei,DONG Xue-lin.Determination of Volatile and Nonvolatile Trace Elements in Geochemical Samples by Fluoride Solid Buffer-AC Arc Direct Reading Emission Spectrometry[J].Rock and Mineral Analysis,2017,36(4):367-373
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Determination of Volatile and Nonvolatile Trace Elements in Geochemical Samples by Fluoride Solid Buffer-AC Arc Direct Reading Emission Spectrometry
Received:August 23, 2016  Revised:May 30, 2017
DOI:10.15898/j.cnki.11-2131/td.201608230125
Key words: geochemical samples  volatile elements  nonvolatile elements  Arc Direct Reading Emission Spectrometry  buffer  fluorination
Author NameAffiliationE-mail
WANG He-ling Geological Research Center of Hubei Province, Wuhan 430034, China  
LI Guang-yi Geological Research Center of Hubei Province, Wuhan 430034, China  
QU Shao-peng Geological Research Center of Hubei Province, Wuhan 430034, China  
QIAN Yu-ping Geological Research Center of Hubei Province, Wuhan 430034, China  
QIU Xiu-mei Geological Research Center of Hubei Province, Wuhan 430034, China  
DONG Xue-lin Geological Research Center of Hubei Province, Wuhan 430034, China dongxlin109@126.com 
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Abstract:
      It is not necessary to digest a sample if it is determined by Arc Direct Reading Emission Spectrometry, and multiple elements can be simultaneously determined by solid injection. Currently used geochemical solid buffers, such as potassium persulfate and sodium fluoride have a low temperature arc flame, and can only analyze silver, boron, tin, molybdenum, lead, copper and other volatile elements but cannot analyze chromium, manganese, titanium and other high boiling point elements. Alkali metal was used to control the low arc temperature, and a solid buffer composed of aluminum fluoride, PCTFE and other high efficiency fluorination compounds was prepared based on the fact that the reaction between difficult volatile elements and fluorine ion under high temperature would have lower excitation energy. By optimizing the choice of line pairs, exposure time, electrode shape and other analysis conditions, 14 volatile and non-volatile elements in the geochemical samples can be simultaneously analyzed. The detection limit of the method ranges from 0.016 to 46.93 μg/g, and the relative standard deviation is 4.1% to 12.3%. The accuracy was verified by national standard material. The results were in accordance with the standard values, and the parameters meet the requirements of geochemical census. The method has high analysis efficiency and is practical in geochemical analysis.