- 作者: Hung-Wei Liu and Shiuh-Jen Jiang
- 中文摘要: Electrothermal vaporization inductively coupled plasma mass spectrometry (ETV-ICP-MS) has been applied to the determination of Hg and Tl in seawater samples. Various modifiers were tested for the best signal of these elements. After preliminary studies, 0.3% EDTA, 0.1% m/v TAC and 1% v/v HCl were added to the sample solution to work as the modifier. Since the sensitivities of Hg and Tl in various seawater matrices and aqueous standard solutions were quite different, standard addition method and isotope dilution method were used for the determination of Hg and Tl in these seawater samples. This method was applied to the determination of Hg and Tl in NASS-4 and CASS-3 reference seawater samples and seawater samples collected from the Kaohsiung area. Results obtained by isotope dilution method and method of standard additions agreed satisfactorily. Detection limits were in the range of 5-15 and 0.4-0.5 ng l-1 for Hg and Tl in seawater, respectively, with the ETV-ICP-MS method. The precision between sample replicates was better than 18% for all the determinations.
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