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Determination of Ethylenethiourea (ETU) at Trace Levels in Water Samples by Cathodic Stripping Voltammetry
Author(s) -
de Carvalho Leandro M.,
do Nascimento Paulo C.,
Bohrer Denise,
DelFabro Luciana
Publication year - 2004
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200302972
Subject(s) - chemistry , cathodic stripping voltammetry , detection limit , hanging mercury drop electrode , stripping (fiber) , supporting electrolyte , voltammetry , metal ions in aqueous solution , mercury (programming language) , trace amounts , electrolyte , analytical chemistry (journal) , metal , chromatography , electrode , electrochemistry , materials science , medicine , alternative medicine , organic chemistry , composite material , pathology , computer science , programming language
A stripping voltammetric method for the determination of ethylenethiourea in water samples is described based on its adsorptive deposition at the hanging mercury drop electrode (HMDE). In a borate buffer (pH 9.0) as supporting electrolyte, ETU is deposited at +100 mV (vs. Ag/AgCl) and stripped during the cathodic scan. The linear range for the measurements was from 2.0 to 100 μg L −1 , with a detection limit calculated as 1.4 μg L −1 after a deposition time of 300 s and a RSD of 1.9% ( n =5) for 50 μg L −1 of ETU measured. The interferences of some organic compounds and metallic ions were tested. Recoveries between 93 and 110% were obtained using the standard addition method for spiked samples of natural and drinking waters. The method is rapid and applicable in the monitoring of ETU residues in water samples.