Journal
ANALYTICA CHIMICA ACTA
Volume 557, Issue 1-2, Pages 45-51Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2005.10.037
Keywords
self-assembled monolayers; D,L-penicillamine SAM; thiodimethylglyoxime SAM; Cu determination; adsorptive stripping analysis
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D,L-Penicillamine and thiodimethylglyoxime (TDMG) self-assembled monolayers (SAMs) on gold electrode were prepared and characterized by electrochemical measurements. The two sensors exhibit sensitive and selective response to Cu(II), both forming 2:1 complexes, the first one in acetic buffer and the second one in ammonia buffer. Copper determination at trace level (LOQ 0.2 and 0.3 mu g/L for D,L-penicillamine and TDMG, respectively) is possible with both the electrodes as verified in tap, spring and sea water. The influence on copper determination of most common ions present in natural waters and of organic matter has been investigated. Accuracy was checked by recovery test on spiked samples. (c) 2005 Elsevier B.V. All rights reserved.
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