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Elimination of SAS Interferences in Catalytic Adsorptive Stripping Voltammetric Determination of Cr(VI) by Means of Fumed Silica
Author(s) -
Niewiara Ewa,
Baś Bogusław,
Kubiak Władysław W.
Publication year - 2007
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.200703949
Subject(s) - fumed silica , hanging mercury drop electrode , adsorptive stripping voltammetry , chemistry , chromium , electrode , stripping (fiber) , mercury (programming language) , detection limit , analytical chemistry (journal) , electrochemistry , chromatography , voltammetry , nuclear chemistry , materials science , organic chemistry , composite material , computer science , programming language
In the work the procedure of chromium(VI) determination by catalytic adsorptive stripping voltammetry (CAdSV) with application of fumed silica, is presented. Two variants of the method are proposed: in the first fumed silica is put directly to the electrolytic cell containing tested solution, in the second the silica is shaken with the sample and next centrifuged. The effectiveness of many surface‐active substances removal from synthetic solutions as well as natural water samples, is studied. In the experiments the fumed silica (Sigma‐Aldrich) of the specific surface area in the range 200–390 m 2 g −1 was used. Two types of the working electrodes were applied, i.e., hanging mercury drop electrode (HMDE) and cyclic renewable mercury film electrode (Hg(Ag)FE). In the silica presence i) the relative standard deviation ( RSD ) for 0.1 μg L −1 Cr(VI) is <2% (HMDE) and <5% (Hg(Ag)FE), n =7, ii) the detection limits estimated deposition time 20 s were respectively 14 ng L −1 (HMDE) and 22 ng L −1 (Hg(Ag)FE). The accuracy of the method was tested by studying the recovery of Cr(VI) from spiked natural water samples.