Speciation analysis of selenium using voltammetric techniques

Ochsenkuhn-Petropoulou, M; Tsopelas, F

dc.contributor.author	Ochsenkuhn-Petropoulou, M	en
dc.contributor.author	Tsopelas, F	en
dc.date.accessioned	2014-03-01T02:42:09Z
dc.date.available	2014-03-01T02:42:09Z
dc.date.issued	2002	en
dc.identifier.issn	0003-2670	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30823
dc.subject	Differential pulse cathodic stripping voltammetry	en
dc.subject	Dimethyldiselenide	en
dc.subject	Se speciation	en
dc.subject	Se(VI)	en
dc.subject	Selenocystine	en
dc.subject.classification	Chemistry, Analytical	en
dc.subject.other	alcohol	en
dc.subject.other	dichloromethane	en
dc.subject.other	dimethyl diselenide	en
dc.subject.other	electrolyte	en
dc.subject.other	hydrochloric acid	en
dc.subject.other	mercury	en
dc.subject.other	selenium derivative	en
dc.subject.other	selenocystine	en
dc.subject.other	unclassified drug	en
dc.subject.other	accuracy	en
dc.subject.other	acidity	en
dc.subject.other	analytic method	en
dc.subject.other	conference paper	en
dc.subject.other	differential pulse voltammetry	en
dc.subject.other	electric potential	en
dc.subject.other	electrode	en
dc.subject.other	extraction	en
dc.subject.other	fly ash	en
dc.subject.other	priority journal	en
dc.subject.other	soil	en
dc.subject.other	Fraxinus	en
dc.title	Speciation analysis of selenium using voltammetric techniques	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1016/S0003-2670(02)00091-0	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0003-2670(02)00091-0	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	A simple and accurate method for the separation and determination of Se(IV), selenocystine and dimeihyldiselenide has been developed based on differential pulse cathodic stripping voltammetry (DPCSV) at a hanging mercury drop electrode (HMDE) and an extraction procedure for the prior separation of the Se species. Thus, selenocystine and Se(IV) were determined simultaneously in the aqueous phase using HCl as electrolyte, while the determination of dimethyldiselenide was achieved in the organic phase after extraction of the sample with dichloromethane using as electrolyte LiClO4 in absolute ethanol acidified with HCl. No significant effect on the determination of selenocystine by the presence of sulfur-cystine, even in a 300-fold greater concentration, was observed. For the optimization of the procedure several parameters of the voltammetric determination, such as the deposition time and voltage, the kind of electrolyte and the acidity of the sample as well as the kind of extractant for the effective separation of the Se species were investigated in the aqueous and organic phase. Moreover, the quantitatively transformation of the electrochemically inactive Se(VI) to Se(II) was achieved by testing different reducing agents. The capability of the developed procedure was tested on the SRM 1633a (coal fly ash) reference material and the whole procedure was applied on a soil sample of Thermopyles Spa (Greece). (C) 2002 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Analytica Chimica Acta	en
dc.identifier.doi	10.1016/S0003-2670(02)00091-0	en
dc.identifier.isi	ISI:000177899000018	en
dc.identifier.volume	467	en
dc.identifier.issue	1-2	en
dc.identifier.spage	167	en
dc.identifier.epage	178	en