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介绍了一种将液液萃取分离富集方法与原子荧光光谱法联用直接测定环境水样中甲基汞的新方法。采用液液萃取法将甲基汞从样品基体中分离出来,发现了适合直接测定甲基汞的原子荧光光谱法分析条件,步骤简单,尽量避免了样品前处理和分析过程中的形态转化与干扰等问题。在最优化的实验条件下,方法检出限为5.0ng·L~(-1),精密度(用RSD表示)为8.6%(甲基汞含量0.1μg·L~(-1),n=7),对池塘水和河水进行加标回收实验,平均回收率在82.0%—109.0%之间。
A new method for the direct determination of methylmercury in environmental water samples by liquid-liquid extraction and enrichment with atomic fluorescence spectrometry was introduced. Liquid-liquid extraction of methylmercury from the sample matrix was isolated and found suitable for direct determination of methylmercury by atomic fluorescence spectrometry analysis conditions, the steps are simple, try to avoid the sample preparation and analysis of morphological transformation and interference And other issues. Under the optimized experimental conditions, the detection limit of the method was 5.0 ng · L -1 and the precision (RSD) was 8.6% (methyl mercury content 0.1 μg · L -1, n = 7), the pond water and river water spiked recovery experiments, the average recovery was between 82.0% -109.0%.