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水中汞(无机汞、有机汞、总汞)的测定,梅崎提出用原子吸收法,在酸性介质中测无机汞,在碱性介质中测总汞,由总汞减去无机汞即可算出有机汞。该法简单、快速、灵敏。国内也采用此方法,但对有机汞的测定没有很好解决,特别是当无机汞与有机汞的比值大于20:1时测定误差较大。本文主要针对上述问题进行了探讨。梅崎提出的循环通气法只是使无机汞部分变成汞蒸气从溶液中逸出,且与液相汞浓度达到平衡时有最大吸收。我们认为如果破坏上述平衡,继继循环通气直至无机汞全部排除后,则在碱性介质中测有机汞就可行。实验证明,本法不但可以测无机汞而且可以直接准确地测定有机汞,相对标准偏差为5.7％,回收率95％。此后有人用巯基棉分离原子吸收测定无机汞和有机汞也取得了较好效果。
Determination of mercury in water (inorganic mercury, organic mercury, total mercury), Meiqi proposed atomic absorption method, the determination of inorganic mercury in acidic medium, total mercury in alkaline medium, total mercury minus inorganic mercury can be calculated organic HG. The method is simple, fast and sensitive. This method is also used domestically, but the determination of organic mercury is not well resolved, especially when the ratio of inorganic mercury to organic mercury is greater than 20: 1. This article focuses on the above issues were discussed. The reclaimed aeration method proposed by Meiqi only makes the inorganic mercury part become mercury vapor to escape from the solution and has the maximum absorption when it reaches the equilibrium with the liquid mercury concentration. In our opinion, if the above balance is broken, it is feasible to measure the presence of organic mercury in alkaline medium after the ventilation is completely eliminated until inorganic mercury is completely eliminated. Experiments show that this method not only can measure inorganic mercury but also can directly and accurately determine organic mercury, with a relative standard deviation of 5.7% and a recovery of 95%. Since then, some people use the mercapto-cotton separation and atomic absorption spectrometry to determine the inorganic mercury and organic mercury have also achieved good results.