论文部分内容阅读
在含有金的玫瑰红银试剂-盐酸体系中,玫瑰红银试剂被3价金所氧化,其氧化产物在-0.91伏出现一吸附波,利用此波间接测定微量金,具有较高的测定灵敏度(4×10~(-8)M),但在盐酸溶液中试验空白值不够稳定,影响测定下限。试验发现在1M高氯酸介质中含2.5×10~(-5)M玫瑰红银试剂-0.1%盐酸羟胺-0.05M柠檬酸的底液中,试验空白值趋近于零,可用于1微克以下金的测定。金量在0.1—15微克/10毫升范围内与峰高呈线性关系。矿样分解后通过泡沫塑料和巯基棉两次分离富集,可与共存元素分离,消除干扰。方法适于矿石中0.05克/吨以上金的测定。一、主要试剂及仪器金标准溶液取光谱纯金以王水溶解,配制成每毫升含10微克金的标准液。玫瑰红银试剂(0.0025M)取0.0065克试剂用10毫升盐酸溶解(用时配制)。泡沫塑料多孔聚醚型聚氯脂泡沫塑料,剪成
In the gold-containing rose-silver reagent - hydrochloric acid system, the rose-red silver reagent is oxidized by 3-valent gold, and the oxidation product shows an adsorption wave at -0.91 volt. Indirect determination of trace gold using this wave has high sensitivity (4 × 10 ~ (-8) M), but the test blank value in hydrochloric acid solution is not stable enough, affecting the lower limit of determination. The test found that in 1M perchloric acid medium containing 2.5 × 10 ~ (5) M Rose Silver Reagent -0.1% hydroxylamine hydrochloride -0.05M citric acid bottom liquid, the test blank value close to zero, can be used for 1 microgram The following gold determination. The amount of gold in the 0.1-15 micrograms / 10 ml range and the peak height of a linear relationship. After the sample is decomposed, it can be separated and enriched with foam and mercapto cotton two times, separated from co-existing elements and eliminated interference. The method is suitable for the determination of gold above 0.05 g / t in ores. First, the main reagent and instrument gold standard solution Take the spectrum of pure gold dissolved in aqua regia, prepared per milliliter containing 10 micrograms of gold standard solution. Rose gold silver reagent (0.0025M) Take 0.0065 grams of reagent dissolved in 10 ml of hydrochloric acid (formulated with time). Foam Porous Polyether Polyurethane Foam, cut into pieces