原子荧光法测定饮用水中锡的方法改进

Improvement of Atomic Fluorescence Spectrometry for the Detection of Tin in Drinking Water

摘要:
目的建立灵敏可行的测定饮用水中锡(Sn)的原子荧光光谱检测方法。
方法通过控制反应酸度、试剂浓度等试验条件，应用氢化物发生—原子荧光法测定水样中的痕量Sn。
结果在1.0 ~ 10.0 μg/L的范围内，Sn的浓度和原子荧光强度成线性关系(r = 0.999 9)，11次测定结果表明方法检出限为0.17 μg/L，其相对标准偏差(RSD)小于4%;样品回收率在91% ~ 99%之间。
结论与Sn国标方法相比，改进的方法试剂用量减少1倍，灵敏度提高了5倍，方法简单快速，结果可靠，适用于饮用水及涉水产品中锡的测定。

Abstract:
Objectives To develop a sensitive method for the determination of tin in drinking water by atomic fl uorescence spectrometry.
Methods Trace amount of Tin ions in water samples was detected by atom fluorescence spectra technology through controlling the reaction pH and reagent concentration.
Results Linear curve was obtained in the range of 1.0 ~ 10.0μg/L with a correlation coefficient of 0.999 9. The limit of detection was 0.17 μg/L (n = 11) and the relative standard deviation (RSD) was less than 4%. The recovery of water samples was in the range of 91% ~ 99%.
Conclusions The improved method was rapid, precise and convenient in comparison with the national standards route. The method was suitable for the determination of Sn in drinking water and in products related to drinking water.