Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
BCSJ Award Article
Preconcentration of Trace Metals in Water Using a Newly Designed Thermoresponsive Chelating Polymer for the Sensitive Determination by Graphite Furnace Atomic Absorption Spectrometry
Tohru SaitohAkihiro ArakawaMasataka Hiraide
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2013 Volume 86 Issue 4 Pages 438-444

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Abstract

A thermoresponsive polymer containing highly dense iminodiacetic acid segments was newly designed for the efficient preconcentration of trace metals in water. The polymer was synthesized by the water-soluble carbodiimide-mediated condensation of poly(N-isopropylacrylamide-co-acrylic acid) with polyallylamine and the subsequent conversion of amino groups to iminodiacetic acid. Metal ions in water were collected by adding the thermoresponsive polymer, sodium nitrate, dodecyltrimethylammonium chroride, and buffer components and then heating the resulting solution to form polymer deposits. The use of 0.02% (w/v) thermoresponsive polymer allowed the nearly complete (>99.8%) collection of seven metals (Be, Co, Ni, Cu, Cd, In, and Pb) in the pH range of 6.8–8.3. The polymer deposits were readily collected as a condensed coagulate and dissolved with a small amount of water for the analysis by graphite furnace atomic absorption spectrometry. Because of highly efficient (100-fold) concentration, these metals at pg cm−3–ng cm−3 levels were successfully determined. The precision and accuracy were evaluated by analyzing certified reference water samples.

The use of a newly designed thermoresponsive polymer having highly dense iminoacitic acid segments allowed nearly complete collection of different metal ions from water for the sensitive determination by graphite furnace atomic absorption spectrometry. Fullsize Image
 
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© 2013 The Chemical Society of Japan
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