Experimental and Theoretical Study of Determination of Trace Gold by Atomic Fluorescence Spectrometry
Received date: 2016-02-23
Revised date: 2016-06-12
Online published: 2016-11-17
It is found that the present of 0.04% DDTC in sample solution and 0.2% DDTC in reductant solution at the same time can greatly enhance generation efficiency of volatile species of Au.The problem that computer automatic adjustment range does not meet the experimental conditions of shielding gas or carrier gas can be solved by connecting a rotor flowmeter with control valve in series in shielding （or carrier） gas path.The measuring range of the rotor flowmeter is 0~1 200 mL/min，and it can be adjusted manually.The result shows that the optimal signal intensity and signal-to-noise ratio can be gotten when carrier gas flow rate is 100 mL/min and the shield gas flow rate is 700 mL/min.Signal is above ten times stronger than AAS method after optimizing the parameter of instrument and chemical vapor generation.The method is used in determination of gold of ore sample，the results are consistent with those gotten by flame AAS.The reaction mechanism can be assumed by comparing molecule structure of DDTC，polyurethane foam and thiourea molecules，which will help find new gold sensitizations.
CHENG Wenkang , ZHOU Liping , NING Xinxia , WANG Haijun . Experimental and Theoretical Study of Determination of Trace Gold by Atomic Fluorescence Spectrometry[J]. Gold Science and Technology, 2016 , 24(4) : 128 -132 . DOI: 10.11872/j.issn.1005-2518.2016.04.128
［1］ Du X G，Xu S K.Flow-injection chemical vapor-generating procedure for the determination of Au by atomic absorption spectrometry［J］.Fresenius Journal Analytical Chemistry，2001，370：1065-1070.
［2］ Ma H B，Fan X F，Zhou H Y，et al.Preliminary studies on flow-injection in situ trapping of volatile species of gold in graphite furnace and atomic absorption spectrometric determination［J］.Spectrochimica Acta Part B，2003，58（1）：33-41.
［3］ Li Z X.Studies on the determination of trace amounts of gold by chemical vapour generation non-dispersive atomic fluorescence spectrometry［J］.Journal of Analytical Atomic Spectrometry，2006，21（4）：435-438.
［4］ 马建学，路学东，许卓.化学蒸气发生—无色散原子荧光光谱法测定地质样品中微量和痕量金［J］.岩矿测试，2011，30（3）：343-348.
［5］ 段旭川，季慧苹.路易斯碱对金的化学蒸气发生效率增强的初步研究［J］.分析化学，2012，40（12）：1929-1932.
［6］卜范龙，郭文丽，段旭川.含有孤对电子的路易斯碱作为金化学蒸气发生的催化增敏剂的结构特征及增敏效果［J］.理化检验（化学分册），2014，50（4）：500-502.
［7］ 邓勃.应用原子吸收与原子荧光光谱分析［M］.北京：化学工业出版社，2007：35.
［8］ 郑大中.聚氨醋泡沫塑料富集金若干问题的探讨［J］.黄金，1990，11（9）：44-49.
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