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Simultaneous determination of mercury and arsenic by anodic stripping voltammetry
Author(s) -
Viltchinskaia E. A.,
Zeigman L. L.,
Garcia D. M.,
Santos P. F.
Publication year - 1997
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.1140090811
Subject(s) - arsenic , mercury (programming language) , chemistry , anodic stripping voltammetry , reagent , stripping (fiber) , analytical chemistry (journal) , detection limit , electrochemistry , relative standard deviation , voltammetry , electrode , inorganic chemistry , chromatography , materials science , organic chemistry , composite material , computer science , programming language
Abstract An electrochemical method for the simultaneous determinations of Hg II concentration and total As III and As V concentration has been developed. The method does not require the additional preliminary step of the chemical reduction of As V to As III , or oxidation of As III to As V before stripping analysis takes place. Also, the method for the simultaneous determination of Hg II concentration and As III concentration is described. Measurements were performed in 0.1 M HCl using a gold‐plated graphite electrode as sensor. Detection limits for both methods are below 0.4 ppb. Relative standard deviation did not exceed 15%. The possible interference by other trace metals was investigated. Analyses of natural water and industrial solutions were made using proposed methods and AAS. The t ‐test demonstrates that there was no significant difference between the results obtained with these methods. Proposed methods decrease the time of analysis because concentrations of the Hg II and arsenic ions were measured simultaneously. Also, the removal of the additional step of chemical reduction of As V to As III or oxidation of As III to As V decreases analysis time, and also reduces the chance of contamination due to the use of additional reagents.