Collection of trace metals with cationic surfactant-silica particles followed by flotation with an anionic surfactant for seawater analysis |
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Authors: | Matsumiya Hiroaki Kitakata Kengo Hiraide Masataka |
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Institution: | (1) Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan;(2) Present address: Division of Environmental Research, EcoTopia Science Institute, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan |
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Abstract: | The analysis of seawater for trace metals is important for pollution monitoring and better understanding of marine systems.
The present paper describes an efficient preconcentration method for the determination of trace metals in seawater. Trace
metals Ni(II), Cu(II), Ga(III), Cd(II), Pb(II), and Bi(III)] in 1,000 mL of seawater sample were complexed with ammonium
pyrrolidinedithiocarbamate and sorbed onto silica particles covered with cetyltrimethylammonium chloride. After the addition
of sodium dodecyl sulfate, the particles were floated to the solution surface by bubbling and then collected by suction. The
trace metals were desorbed with dilute nitric acid and determined by inductively coupled plasma–mass spectrometry. The rapid
200-fold preconcentration was demonstrated with certified seawater samples. |
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