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研究了用锑作捕集剂富集地质物料中ng/g级金的新火试金法。此法分为捕集和灰吹两部分。当样品同含有氧化锑、碳酸钠、碳酸钾、硼砂、氧化铋和面粉的熔剂在950℃熔融时,金被捕集在熔融的锑中。然后灰吹此锑合金而得到含金的试金合粒(Ag粒或Ag-Pd粒)。结果表明,对于金的富集,锑试金法优于或等于铅试金,而试剂空白则低得多。试金合粒中金的测定可用发射光谱法(ES)或石墨炉原子吸收光谱法(AAN)完成。此两法的检出限都是0.1ng/g,分析空白0.7±0.3ng。对于3.4ng/g的样品,全过程的相对标准偏差,用ES法为10％,用AAN法是3.7％。上述方法快速,用于6个标准物质的测定,结果满意。
The new fire test method for enriching ng / g gold in geological materials by using antimony as collector was studied. This method is divided into capture and ash blowing in two parts. Gold is trapped in molten antimony when it is melted at 950 ° C with a flux containing antimony oxide, sodium carbonate, potassium carbonate, borax, bismuth oxide and flour. Then, the antimony alloy is blown to obtain a gold-containing gold alloy (Ag particle or Ag-Pd particle). The results show that for gold enrichment, the antimony assay is better than or equal to the lead assay, while the reagent blank is much lower. Gold assay gold tablets can be measured by emission spectrometry (ES) or graphite furnace atomic absorption spectrometry (AAN) to complete. The detection limits of these two methods are 0.1ng / g, the analysis of the blank 0.7 ± 0.3ng. For the 3.4 ng / g sample, the relative standard deviation of the whole process was 10% by ES method and 3.7% by AAN method. The above method is rapid, for the determination of six standard substances, the results are satisfactory.