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目的为解决汞因吸附而产生的记忆效应问题,本文研究了不同浓度汞产生记忆效应的效果,以及金溶液对消除汞记忆效应的影响。方法采用电感耦合等离子体质谱法(ICP-MS)测定溶液中汞的含量。结果在无任何消除汞记忆效应的措施下,0.5μg/L的汞即可产生明显的记忆效应,且随着汞浓度的增加,记忆效应不断增强;金溶液消除汞的记忆效应与汞的浓度相关,当CHg<1μg/L时,CAu∶CHg=2∶1时,即可很好的消除汞的记忆效应;但随着汞浓度的增加,金汞比为2∶1时,金溶液不能完全消除汞的记忆效应,需增大金汞比;汞的记忆效应与金溶液浓度相关,当CAu>75μg/L时,汞的记忆效应控制在5%以内,记忆效应基本消除;当金汞比>100时,汞的回收率<95%,金汞比应控制在2~100。结论本研究对ICP-MS测定汞时消除记忆效应有一定的指导作用,为ICP-MS法成为汞元素分析标准方法提供支持。
Aim To solve the problem of memory effect caused by mercury adsorption, this paper studies the effect of different concentration of mercury on memory effect and the effect of gold solution on eliminating mercury memory effect. Methods Inductively coupled plasma mass spectrometry (ICP-MS) was used to determine the amount of mercury in solution. Results Without any effect of eliminating mercury memory effect, 0.5 μg / L mercury could produce significant memory effect and the memory effect increased with the increase of mercury concentration. The memory effect of gold solution to eliminate mercury and mercury concentration , When CHg <1μg / L, CAu:CHg = 2:1, the memory effect of mercury can be well eliminated; but with the increase of mercury concentration, when the ratio of gold to mercury is 2: 1, the gold solution can not Mercury-to-metal ratio was needed to completely eliminate the memory effect of mercury. The memory effect of mercury was related to the concentration of gold solution. When CAu> 75μg / L, the memory effect of mercury was controlled within 5%, and the memory effect was basically eliminated. When the ratio is more than 100, the recovery rate of mercury is less than 95% and the ratio of gold and mercury should be controlled between 2 and 100. Conclusion This study provides a guideline for the elimination of memory effect by mercury determination by ICP-MS and supports the standard method of elemental mercury analysis by ICP-MS.