水中全水銀およびアルキル水銀のフェニル化によるGC/MS分析法

抄録

An analytical method for total mercury and alkylmercury (methylmercury chloride and ethyimercury chloride) in water by GC/MS was developed.
In the analysis of total mercury, mercury compounds in 500 ml of water sample were oxidized to divalent mercury (Hg(II)) with nitric acid and sodium persulfate, and the generated Hg(II) was adsorbed on a chelating resin in the pH range from 5 to 7. After elution with 25 ml of 6N HCI, Hg(II) was phenylated with sodium tetraphenylborate in the pH range from 3 to 10. The generated diphenyimercury was extracted with n-hexane and was analysed by GC/MS.
In the analysis of alkylmercury, alkylmercurys were concentrated and purified by extraction with toluene and reverse extraction with L-cysteine-sodium acetate solution. Methylmercury chloride and ethylmercury chloride were changed to methylpheylmercury and ethylpheylmercury respectively by the phenylation method mentioned above, and these compounds were analysed by GC/MS in the same way as the analysis of total mercury.
Using the methods described above, 1.0 μg Hg·l^-1 of total mercury and 0.5 μg Hg·l^-1 of each alkylmercury in water could be analyzed.