Determination of cadmium, copper, lead, zinc, chromium and nickel in seawater by atomic absorption spectrometry after extraction separation
WANG Zeng-huan1, 2, 3, WANG Xu-nuo1, 2, 3
1.South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China; 2.Key Laboratory of Fishery Ecology Environment, Guangdong Province, Guangzhou 510300, China; 3.Key Laboratory of Aquatic Product Processing, Ministry of Agriculture, Guangzhou 510300, China
Abstract：An atomic absorption spectrometric method for the determination of copper, lead, cadmium, zinc, chromium and nickel in seawater was established. Under the conditions of pH 4.0±0.5 and heating in a water bath, with ammonium pyrrolidine dithiocarbamate (APDC) as a chelating agent, copper, lead, cadmium, zinc, chromium and nickel were chelated quantitatively to form chelates which were extracted by MIBK, then zinc was determined by flame atomic absorption spectrometry and the other elements were determined by graphite furnace atomic absorption spectrometry. The results showed that the detection limits for cadmium, chromium, copper, lead, nickel and zinc were 0.04, 0.3, 0.13, 0.2, 0.4 and 1.0 g/L, respectively. Certified reference seawater samples GBW (E) 080040 was analyzed, except that nickel had no certified value, the measured results of the other elements were consistent with the certified values. The method was applied to the analysis of seawater from the Pearl River estuary and the Daya Bay, with the relative standard deviations (RSD, n=7) for the measurement results of each element between 2.3 % to 6.5 % and the recoveries in the range of 94 %-105 %.
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