流动注射冷蒸气发生法测定环境样品中痕量汞

Determination of Mercury in Enviromental Samples by Flow Injection Cold Vapor Atomic Absorption Spectrometry

以气体扩散膜为分离装置 ,流动注射进样冷蒸气发生法测定了土壤中的汞。试验了载流种类、流速、浓度 ,还原剂的浓度、流速 ,载气及其流速等分析参数对测定的影响。实验中观察到 Cr( )对汞的响应信号有负干扰。方法的线性范围为 0～ 2 0μg/L ,检出限为 0 .0 1μg/L,在 2μg/L、5μg/L含量水平测定 ,方法的相对标准偏差( RSD)分别为 1 .5%和 0 .54 %。回收率在 91 %～ 1 1 0

A method for the detemination of total mercury in soil samples based on cold-vapor generation atomic absorption spectrometry in combination with flow injection sampling is described. Calibration graphs are linear for 0 to 20 ng/mL of Hg(Ⅱ). The detection limit (3σ) obtained is 0 01 ng/mL. Other ions typically presented in soil solutions have no interference except Cr(Ⅵ). The present method allows the determination of mercury in the range of 0～20 ng/mL with a relative standard deviation (RSD) of 0.5%～1.5% at the rate of 90 samples/h. Recoveries for soils are 91%～110%. The method has been applied to the determination of mercury in soil samples.