合并通道–原子荧光光谱法测定地表水中汞

Determination of Mercury in Surface Water by Combined Channel–Atomic Fluorescence Spectrometry

建立合并通道–原子荧光光谱法测定地表水中超痕量汞的分析方法。采用微孔滤膜过滤、盐酸酸化处理地表水,以合并通道技术提高原子化效率,研究了合并通道对灵敏度以及检出限的影响。在优化的实验条件下,汞含量在0~2μg/L范围内与原子荧光响应值呈良好的线性关系,相关系数为0.999 1,检出限为0.000 3μg/L,测定结果的相对标准偏差小于5%(n=7),加标回收率在82.0%~110.0%之间。该法准确可靠,检出限低,可用于地表水中超痕量汞的检测。

The method for the determination of ultron trace mercury in surface water by means of combined channel–atomic fluorescence spectrometry was developed. Surface water sample was disposed by microporous membrane filtration and hydrochloric acid acidification. The influence of combined channel on sensitivity and detection limit was studied. Under the optimized conditions, the mercury content had good linear relationship with the atomic fluorescence signal value in the range of 0–2 μg/L,the correlation coefficient was 0.999 1, the detection limit 0.000 3 μg/L. The relative standard deviation of determination results was less than 5%（n=7）,and the standard addition recovery rate was 82.0%–110.0%. The method is accurate and reliable with the low detection limit, and it can be used for the detection of ultratrace mercury in surface water.