Premium
Voltammetric Behavior of Arsenic(III) in the Presence of Sodium Diethyl Dithiocarbamate and Its Determination in Water and Highly Saline Samples by Adsorptive Stripping Voltammetry
Author(s) -
de Carvalho Leandro M.,
do Nascimento Paulo C.,
Bohrer Denise,
Pilau Eduardo J.,
Stefanello Raquel,
Lauer Markus
Publication year - 2006
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.200503505
Subject(s) - chemistry , dithiocarbamate , detection limit , adsorptive stripping voltammetry , cathodic stripping voltammetry , hanging mercury drop electrode , arsenic , stripping (fiber) , deposition (geology) , voltammetry , chromatography , sodium , nuclear chemistry , electrode , electrochemistry , materials science , paleontology , organic chemistry , composite material , sediment , biology
This paper describes the voltammetric behavior of As(III) at the hanging mercury drop electrode (HMDE) in the presence of sodium diethyl dithiocarbamate (SDDC) and a new voltammetric method for the determination of As(III) at trace levels. The method is based on the adsorptive deposition of a As(III) complex with SDDC at −0.45 V (vs. Ag/AgCl) on the HMDE in acidic medium of 0.01 mol L −1 HCl (pH 2.0) and its cathodic stripping during the potential scan (100 mV s −1 ). The linear range for the determination of As(III) in the presence of SDDC (4 μmol L −1 ) in water samples was between 1 and 10 μg L −1 for a deposition time of 300 s ( r =0.994) and between 10 and 100 μg L −1 for a deposition time of 60 s ( r =0.999). For the determination of As(III) in dialysis concentrate samples, the linear range was between 5 and 25 μg L −1 for a deposition time of 180 s ( r =0.992) and between 10 and 100 μg L −1 for a deposition time of 60 s ( r =0.996). Detection limits of 0.3 and 2.2 μg L −1 in water and dialysis concentrate samples were calculated for the method using a deposition time of 300 and 180 s, respectively. Recovery values between 93.0 and 110.0% for As(III) added to deionized, mineral, seawater (synthetic and real) and dialysis concentrate samples prove the satisfactory accuracy and applicability of the procedure.