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发展了一种能在野外测定0.25~1000μg/g银量的Ag-TMK-DBS三元络合物光导比色测定法。样品经硝酸封闭溶解后,用巯基棉富集分离银,在pH 4.5的乙酸-乙酸钠缓冲介质中,银与硫代米蚩酮(TMK)-十二烷基苯磺酸钠(DBS)形成易溶于水的红色三元胶束络合物,用自行开发研制的光导(比色)分光光度计比色测定痕量银。方法检出限为0.10μg/g,加标回收率为96.0%~99.4%,11次测定的精密度(RSD)小于5.76%。方法较为快速、简便、准确和灵敏,经国家一级标准物质验证,分析结果与标准值吻合。用光导分光光度计测定,准确度和精密度均有很大改进,结果与室内原子吸收光谱分析结果一致。方法具有广阔的应用前景。
An Ag-TMK-DBS ternary complex photoconductive colorimetric assay developed for the determination of silver in the range of 0.25-1000 μg / g in the field has been developed. After the sample was blocked and dissolved in nitric acid, the silver was separated and enriched with sulfhydryl cotton. Silver was formed with TMD-DBS in pH 4.5 acetate-sodium acetate buffer medium Water soluble red ternary micellar complex, with self-developed light guide (colorimetric) spectrophotometer colorimetric determination of trace silver. The detection limit of the method was 0.10 μg / g, the spiked recoveries ranged from 96.0% to 99.4%, and the precision of 11 determinations (RSD) was less than 5.76%. The method is rapid, simple, accurate and sensitive. The method is validated by the national standard materials and the analytical results are consistent with the standard values. With photoconductivity spectrophotometer determination, accuracy and precision have greatly improved, the results and indoor atomic absorption spectrometry results. The method has broad application prospects.