矿产综合利用2024，Vol.45Issue(4)：128-133,6.DOI:10.3969/j.issn.1000-6532.2024.04.019
铋试金-高分辨率连续光源火焰原子吸收光谱法测定矿石中的痕量金
Determination of Trace Au in Minerals by Bismuth Fire Assay with Enrichment-high Resolution Continuum Source Flame Atomic Absorption Spectrometry
摘要
Abstract
This is an article in the field of analytical testing.As a green and environmentally friendly fire gold test method for efficient separation and enrichment of trace precious metals in ore,bismuth gold test effectively avoids the problem of toxic pollution of lead test gold.In this article,Bi2O3 with low toxicity is used as the fire test gold trap of Au element,and Bi2O3 is reduced to Bi by the reducing agent flour in the test ingredient during the high-temperature melting process,and Au2Bi alloy is formed with Au in the samples,and the Ag protective ash blowing method is used to make Au and Ag form about 1mg of Ag zygote.The Ag zygoteum is heated and dissolved by acid solution method to completely enter the solution of Au.In this test,the Au element content in the national standard material GBW 07205 was used as a reference,and the effective pixels of the CCD detector of the continuous light source flame atomic absorption spectrometer were optimized,and 7 were selected as the effective pixels of the CCD detector based on their sensitivity and stability.In the mass concentration range of 0～20 μg/mL,the corresponding absorbance was fitted by the quadratic equation least squares method,the fitting coefficient of the calibration curve was 0.999 8,the characteristic concentration was 0.069 97 μg/mL,and the detection limit of the method was 0.012 7 g/mL.According to the selected experimental method and optimized instrument parameters,Au in the national standard material was determined,and the measured value was in good agreement with the standard value,and the relative standard deviation(RSD,n=6)was 2.23％～4.54％.The established method was applied to the test of Au in actual ore samples,and the recovery rate of spiked was 92.6％～106％.The relative standard deviation(n=6)was 2.53％～4.70％,which met the requirements of the National Geological and Mineral Resources Industry Standard DZ/T 0130-2006.关键词
分析测试/铋试金/Ag保护灰吹法/Au/连续光源火焰原子吸收光谱法Key words
Analytical testing/Bismuth fire assay/Ag protection ash blowing method/Au/Continuum source flame atomic absorption spectrometry分类
天文与地球科学引用本文复制引用
王甜甜,郭晓瑞,樊蕾,毛香菊,刘闫,倪文山..铋试金-高分辨率连续光源火焰原子吸收光谱法测定矿石中的痕量金[J].矿产综合利用,2024,45(4):128-133,6.基金项目
国家自然科学基金项目[22106148] （）
