Simultaneous determination of mercury(II), copper(II) and bismuth(III) in urine by flow constant-current stripping analysis with a gold fibre electrode
✍ Scribed by Huang Huiliang; Daniel Jagner; Lars Renman
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 411 KB
- Volume
- 202
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
Urine samples are treated with concentrated nitric acid and potassium permanganate at 70" C for 10 min prior to injection. The flow electrode system consists of a lo-pm diameter gold fibre working electrode, a glassy carbon reference electrode and a platinum counter electrode. In the fully automated constant-current stripping procedure, the gold fibre is fist covered with a fresh gold fihn after which the sample is electrolyzed for 1 min prior to stripping in 0.1 M hydrochloric acid with a current of 0.1 & The procedure is repeated on a spiked sample after which the sample analyte concentrations are evaluated and presented digitally and graphically on a printer/plotter. The results obtained for bismuth, copper and mercury in a urine reference sample were 36.9,39.7 and 47.7 M 1-l with standard deviations (n= 10) of 3.2,4.2 and 2.1, respectively. The certified values for copper and mercury were 45 and 51 M 1-l; no certified value was available for bismuth.