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Voltammetric Determination of Cr(VI) in Natural Water in the Presence of Bipyridine Following Its Deposition to the Metallic State
Author(s) -
Korolczuk Mieczysław
Publication year - 1999
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/(sici)1521-4109(199911)11:16<1218::aid-elan1218>3.0.co;2-q
Subject(s) - detection limit , tap water , chemistry , metal ions in aqueous solution , metal , deposition (geology) , electrochemistry , analytical chemistry (journal) , chromium , environmental chemistry , chromatography , electrode , environmental science , environmental engineering , sediment , paleontology , organic chemistry , biology
A sensitive and selective voltammetric method for determination of traces of Cr(VI) in natural waters in the presence of Cr(III) is presented. The determinations were performed in a flow system. The calibration plots were linear from 5×10 –10 to 5×10 –9 and from 1×10 –10 to 1×10 –9 mol L –1 for deposition times of 60 and 300 s, respectively. The relative standard deviations were between 4.8 and 14%. The detection limit estimated as 3σ for low Cr(VI) concentration is 4×10 –11 mol L –1 (2 ng L –1 ). The detection limit obtained in direct analyses of river water is 9×10 –11 mol L –1 . The influence of metal ions and surface active compounds is also presented. The validation of the method was made by comparing the results of the analyses of tap water by another electrochemical method and by a recovery test for river water.