Lee Y H
Int J Environ Anal Chem. 1987;29(4):263-76. doi: 10.1080/03067318708075446.
An analytical procedure for determining methyl- and ethylmercury (MeHg/EtHg) in natural waters is described. MeHg/EtHg was preconcentrated from water on a sulfhydryl cotton fiber (SCF) adsorbent and eluted with a small volume of a mixture of 1 M hydrochloric acid and 2 M sodium chloride. The eluate was extracted with benzene. The measurements of MeHg/EtHg in benzene extract were determined by gas chromatography with electron capture detector. The detection limit for MeHg/EtHg was about 0.04 ng L-1 using a 20 L water sample. The precision was about 20%. The application of the proposed method to one snow and four freshwater samples varying in humus content is described. The MeHg concentrations found in different freshwater samples were ranged from 0.09 to 0.22 ng L-1 and the recoveries of spiked MeHg were ranged from 42 to 68% which were strongly correlated to the content of humic substances. The MeHg concentration found in snow was 0.28 ng L-1 and the recovery was 79%. The analytical results of MeHg concentration in freshwater samples are discussed in relation to the pH used in the preconcentration, the humus content, the fraction of methylmercury in organic bound mercury and mercury in fish.
本文描述了一种测定天然水中甲基汞和乙基汞（MeHg/EtHg）的分析方法。MeHg/EtHg通过巯基棉纤维（SCF）吸附剂从水中预富集，并用少量1M盐酸和2M氯化钠的混合物洗脱。洗脱液用苯萃取。苯萃取物中MeHg/EtHg的测定采用带电子捕获检测器的气相色谱法。使用20L水样时，MeHg/EtHg的检测限约为0.04ng L-1。精密度约为20%。描述了该方法在一个雪样和四个腐殖质含量不同的淡水样中的应用。不同淡水样中MeHg浓度范围为0.09至0.22ng L-1，加标MeHg的回收率范围为42至68%，与腐殖质含量密切相关。雪样中MeHg浓度为0.28ng L-1，回收率为79%。结合预富集时使用的pH值、腐殖质含量、有机结合汞中甲基汞的比例以及鱼类中的汞含量，讨论了淡水样中MeHg浓度的分析结果。
