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本文用泡沫塑料吸附—石墨炉原子吸收法测定了矿石、选矿产品中痕量和超痕量的金。试料以王水分解后,选用泡沫塑料吸附分离富集金,不仅选择性好,适用于多种类型矿石、岩石及选矿产品的分析,而且操作简便,成本低廉。研究了测定金的最佳条件,用稀硫脲溶液解脱金,斜坡升温灰化,有效地消除了背景干扰,提高了测量精度。绝对灵敏度为2.5×10~(-11)克,实际测定下限3ppb。含金0.2ppm时,相对标准偏差为6.1%。灵敏度和稳定性均好。本法可以很方便地与火焰原子吸收法联用,测定ppb～ppm含量的金,测定品位范围宽,有较好的实用性。
In this paper, the determination of trace and ultra-trace amounts of gold in ores, beneficiation products by foam adsorption - graphite furnace atomic absorption spectrometry. After the sample is decomposed by aqua regia, the foamed plastic is used to separate and enrich the gold, which not only has good selectivity, but also is suitable for the analysis of various types of ore, rock and beneficiation products, and has the advantages of simple operation and low cost. The optimum conditions for the determination of gold were studied. The solution of gold with dilute thiourea solution and the ashing ascending slope were effectively used to eliminate background interference and improve the measurement accuracy. Absolute sensitivity of 2.5 × 10 ~ (-11) grams, the actual determination of the lower limit 3ppb. Gold 0.2ppm, the relative standard deviation of 6.1%. Sensitivity and stability are good. This method can be easily combined with flame atomic absorption spectrometry, determination of gold ppb ~ ppm content, the determination of a wide range of grades, has good practicality.