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汞及其化合物具有毒性,为防止其污染环境,危害人体健康,近年来人们对未污染地区的本底,生物和食物等样品中汞的监测问题十分关注.通常在这些样品中汞的含量在ppb级.因此研究干扰少、灵敏度高的测汞法越来越引起环境分析工作者的重视.目前,测定汞的方法有双硫腙比色法、火焰原子吸收法、冷原子吸收法、石墨炉原子吸收法、微波等离子体发射光谱法(MIP)、高频等离体发:射光谱法(IOP)、原子荧光法、X荧光法、电化学法及中子活化法等.这些方法中,~(?)MIP法较为灵敏,可测定ppb级以下的汞(最低检出限为0.001ng),其设备简单,易于普及,但目前国内尚未见报道. 本文介绍常压微波氩气等离子体发射光谱系统;研究了该系统中各参数对汞测定的影响,找出了测定汞最佳参数条件;同时采用直接加热固体样品而挥发分离汞的技术,探讨了在加或不加柠檬酸情况下,标准样中汞的挥发与温度关系.最后测定了湘江底泥、高井电厂煤飞灰和上述标准样中汞的含量.
Mercury and its compounds are toxic, and in order to prevent it from polluting the environment and endangering human health, people have been concerned about mercury monitoring in samples of unpolluted areas, organisms and foodstuffs in recent years. Usually, the mercury content in these samples is between ppb level.Therefore, less interference and high sensitivity of mercury detection methods are increasingly attracting the attention of environmental analysis workers.At present, the methods of determination of mercury are dithizone colorimetric method, flame atomic absorption method, cold atomic absorption method, graphite Furnace atomic absorption spectrometry, microwave plasma emission spectroscopy (MIP), high frequency plasma emission spectrometry (IOP), atomic fluorescence spectrometry, X-ray fluorescence spectrometry, electrochemical methods and neutron activation methods, etc. Among these methods (~ (?) MIP method is more sensitive, can be determined ppb mercury level (the minimum detection limit of 0.001ng), the device is simple and easy to popularize, but has not been reported in China.This article describes atmospheric microwave argon plasma Emission spectroscopy system; the impact of various parameters of the system on the determination of mercury was studied, the best parameters for mercury determination were found; the direct heating of solid samples was used to volatilize the mercury, and the effects of citric acid with or without citric acid Under, standard The relationship between mercury volatilization and temperature was also discussed.Finally, the content of mercury in the sediments of Xiangjiang River and Gaojing Power Plant and the above samples were determined.