TITLE

Development of a flow injection method with amperometric detection for the indirect determination of copper in drinking water samples

AUTHOR(S)
LOLIĆ, ALEKSANDAR; TRIPKOVIĆ, TATJANA; BAOŠIĆ, RADA; NIKOLIĆ-MANDIĆ, SNEŽANA; STANIMIROVIĆ, BOJANA
PUB. DATE
November 2012
SOURCE
Journal of the Serbian Chemical Society;2012, Vol. 77 Issue 11, p1641
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A gas-diffusion flow injection method with amperometric detection for the indirect determination of copper on a silver electrode was developed. The flow through system was equipped with two injection valves and a gas-diffusion unit. In the first step, a signal of a cyanide solution was recorded. In the subsequent step, the signal of cyanide in the presence of copper was measured. Interferences (Cd(II), Co(II), Ag(I), Ni(II), Fe(III), Hg(II) and Zn(II)) were investigated and successfully removed. The calibration graph was linear in the range 1-90 µmol dm-3 of copper with a correlation coefficient of 0.993. The regression equation is I = (0.0455±0.0015)c + (0.4611±0.0671), where I is the relative signal decrease in µA and c is concentration in µmol dm-3. Relative standard deviation for six consecutive injections of 30 µmol dm-3 copper(II) was 1.47 % and for 1 µmol dm copper(II), it was 3.40 %. The detection limit, calculated as 3 s/m (where s is a standard deviation of nine measurement of a reagent blank and m is the slope of the calibration curve), was 0.32 µmol dm-3, which corresponds to 2.44 ng of copper(II) (the loop volume was 0.12 cm³). The method enables 60 analyses per hour and it was successfully applied for the determination of copper in drinking water samples.
ACCESSION #
88927913

 

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