热水解—流动注射分析法测定化探样品中的微量溴

THE DETERMINATION OF MININUM BROMIDE IN GEOCHEMICAL EXPLORATION SAMPLES BY USTNG HOT WATER RELEASE WITH FLOW INJECTION ANALYSIS

建立了测定化探样品中微量溴的新方法，即热水解－流动注射分析方法，并成功地用于化探样品中溴的测定。溴的热解率为９８％以上；精密度为３％～５％，热解后样品溶液可直接用于流动注射分析测定，进样频率为１８０次／ｈ精密度（ＲＳＤ％）为０．２４％（ｎ＝８，对含溴离子为０．５ｕｇ／ｍＩＢｒ ￣－样品溶液而言）；检出限为０．０５ｕｇ／ｍｌＢｒ￣－；线性范围为０．０５～１．０ｕｇ／ｍｌＢｒ￣－。用本法对３个地球化学标准参考样（ＧＳＳ－１，ＧＳＳ－３，ＧＳＳ－７）进行分析测定，其测定结果与这些标准样品的推荐值非常地一致。

A new method for determination of bromide in geochemical exploration samples bymeans of heat water relese with flow injection analysis is established in this paper.Meanuhile, the method has been successfully applied to determine the bromide in geochemi-cal exploration samples. The recovery ratio of bromide is more than 98%,The precision isabout 3% 5%. The sample solution can be directly determined by fiow injection analysis.The frequency for determining samples comes to 180 times per hour. The precision(RSD,%)is 0.24%(n=8,for samples containing 0.5ug/mI Br￣-).The detection limit of Br￣-is 0.05ug/ml.Linear calibration ranges between 0.05 and1.0ug/mI Br￣-. 3 geochemical ston-dard reference samples(GSS 1 ,GSS 3, GSS 7)have been dettrmined by this method.Their data are quite identical to the recommended values of the samples.