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环境样品中微量砷的测定,文献报导很多,其中以硼氢化钠还原法为好,其优点是还原能力强(可达100%),回收率在97～103%之间,最大相对误差为水样分析小于20%,其它环境样品分析达30%。在标准样品分析中,2.5±0.2 ppm砷标准样的变异系数为15%是最大的。该方法可用于测定10 ppb以上水样及0.1 ppm以上其它环境样品中微量砷的常规分析,且快速、简便。
Determination of trace arsenic in environmental samples, reported in the literature a lot, of which sodium borohydride reduction method as well, the advantage of reducing ability (up to 100%), the recovery rate of 97 ~ 103%, the maximum relative error of water Less than 20% for sample analysis and 30% for other environmental samples. In the standard sample analysis, the coefficient of variation of 2.5 ± 0.2 ppm arsenic standard is the largest at 15%. The method can be used for the routine analysis of trace arsenic in water samples above 10 ppb and other environmental samples above 0.1 ppm, and is fast and simple.