Analytical procedure for the simultaneous voltammetric determination of toxic metals in dialysis fluids

Locatelli, Clinio
June 2003
Analytical & Bioanalytical Chemistry;Jun2003, Vol. 376 Issue 4, p518
Academic Journal
A new analytical voltammetric procedure for the simultaneous determination of copper(II), lead(II), cadmium(II), zinc(II), chromium(VI), and manganese(II) in two kinds of dialysis fluid (peritoneal and haemodialysis fluids) is described. The voltammetric measurements were performed using, as working electrode, a stationary mercury electrode, and a platinum electrode and a Ag∣AgCl∣KCl (sat.) electrode as auxiliary and reference electrodes, respectively, employing 0.1 mol L-1 dibasic ammonium citrate solution pH 6.9 as supporting electrolyte. For all the elements, the accuracy, expressed as relative recovery R%, was very satisfactory being in the range 94–105%, the precision, expressed as relative standard deviation sr%, was lower than 6%, while the limits of detection were of the order of a few units of μg L-1. The analytical voltammetric procedure has been validated by comparison with spectroscopic (graphite furnace atomic absorption spectroscopy, GFAAS) measurements.


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