ISSN:
1040-0397
Keywords:
Selenium
;
Stripping voltammetry
;
Medium exchange
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
An adsorptive cathodic stripping voltammetric method for the determination of Se(IV) is described. The method is based on the detection of the piazselenol complex formed by Se(IV) with 2,3-diamino naphthalene (2,3 DAN) at pH 2 (0.01 mol L-1 HC1 + 0.1 mol L-1 KC1). The method is based on a medium-exchange scheme and a carbon paste electrode (CPE). The preconcentration step is carried out at open circuit, and then the complex is stripped out by linear sweep voltammetry (LSV) after medium exchange (0.1 mol L-1 HNO2 + 0.1 mol L-1 KNO3 where the working electrode is transferred). The method is characterized by a precision better than 8% and a limit of quantitation (10 times the standard deviation of the blank) of 1.25 × 10-7 mol L-1 (for 20 minutes of preconcentration time). The use of CPE coupled with the medium-exchange scheme reduces the interferences (especially by different classes of surfactants) and improves the selectivity (much better than in the usual cathodic stripping voltammetry on mercury).
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140061129
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