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WANG Zeng-huan,WANG Xu-nuo,GU Yang-guang,CHEN Ying-na.Determination of 5 Heavy Metals in Seawater by Atomic Absorption Spectrometry with Solid-phase Extraction of Hydrophobic Chelate[J].Rock and Mineral Analysis,2017,36(4):360-366
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Determination of 5 Heavy Metals in Seawater by Atomic Absorption Spectrometry with Solid-phase Extraction of Hydrophobic Chelate
Received:January 20, 2017  Revised:July 15, 2017
DOI:10.15898/j.cnki.11-2131/td.201701200011
Key words: seawater  heavy metals  solid phase extraction  green separation technique  dithiocarbamate  Atomic Absorption Spectrometry
Author NameAffiliation
WANG Zeng-huan Key Laboratory of Fishery Ecology Environment of Guangdong Province
Key Laboratory of Aquatic Product Processing, Ministry of Agriculture
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China 
WANG Xu-nuo Key Laboratory of Fishery Ecology Environment of Guangdong Province
Key Laboratory of Aquatic Product Processing, Ministry of Agriculture
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China 
GU Yang-guang Key Laboratory of Fishery Ecology Environment of Guangdong Province
Key Laboratory of Aquatic Product Processing, Ministry of Agriculture
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China 
CHEN Ying-na Key Laboratory of Fishery Ecology Environment of Guangdong Province
Key Laboratory of Aquatic Product Processing, Ministry of Agriculture
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China 
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Abstract:
      The concentration and distribution of heavy metals in seawater are controlled by biogeochemical processes in the ocean. It is difficult to analyze accurately the concentrations of heavy metals in seawater due to the high salinity of seawater and low concentrations of heavy metals. Separation and preconcentration processes are needed. Conventional pretreatment methods include solvent extraction and coprecipitation. During solvent extraction, large volumes of seawater samples and organic solvents are used, complicating the procedure and endangering the environment and operator. The coprecipitation method can readily cause contamination of the analytes. In this study, the concentrations of 5 heavy metals, Cd, Cu, Ni, Pb and Zn in seawater were determined by Atomic Absorption Spectrometry after solid phase extraction of hydrophobic chelate with ammonium pyrrolidine dithiocarbamate and sodium diethyldithiocarbmate as chelating agents. The results show that there is a good correlation (R>0.999) between the absorbance and concentration of Cd, Cu, Ni, Pb and Zn. The linear ranges of the working curve for Cd and Zn were 0-4 μg/L and 0-100 μg/L, respectively, whereas the linear ranges for Pb, Cu, and Ni were 0-40 μg/L. The detection limits (μg/L) of Cd, Zn, Pb, Cu and Ni were 0.02, 2.6, 0.06, 0.18 and 0.3, respectively. The precision and recovery were less than 5% and 93.8%-104%, respectively. This method utilizes the hydrophobic interaction of solid phase extraction technology to realize the green sample pretreatment of seawater analysis.