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Gold Science and Technology ›› 2017, Vol. 25 ›› Issue (2): 110-115.doi: 10.11872/j.issn.1005-2518.2017.02.110

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Discussion on the Optimum Conditions for Determination of Gold in Geological Samples by Atomic Absorption Spectrometry at High Altitude Area

MU Changxian1，YANG Mingrong2，SHI Aiping1   

  1. 1.No.6 Gold Geological Party of CAPF，Xining    810021，Qinghai，China；
    2.No.5 Gold Geological Party of CAPF，Xi’an    710100，Shaanxi，China
  • Received:2016-04-04 Revised:2016-12-27 Online:2017-04-28 Published:2017-05-12

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Abstract:

Aiming at the problems of low atmospheric pressure，low boiling point，low dissolution rate of gold，low release rate of the plastic foam containing gold in thiourea solution at high altitude area，the determination results of plateau and plain areas were compared under the same conditions，and the effect of aqua regia concentration on the dissolution rate of gold was discussed.At the same time，the main influence factors of the determination results were compared，such as two ore dissolving methods，foam adsorption temperature，release method of foam plastics.The optimum conditions for determining gold at high altitude area were obtained through many experiments.The method has been varified by determination of national standard reference material，and the results are consistent with the standard values.The precision of the method is 2.85% to 4.37% with RSD（n=6），and the detection limit is 0.03 μg/mL.The method is suitable for gold analysis in geological samples at high altitude，it solves the technical problem of the determination of gold under low pressure environment in plateau area.

Key words: high altitude area, foam adsorption, thiourea elution, flame atomic absorption spectrometry （FAAS）, gold

CLC Number: 

  • O655
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