Abstract
The application of Potentiometric Stripping Analysis (PSA), without any mercury, to the determination of trace elements lead and zinc, results in linear responses between stripping-peak areas and concentrations within 0 to 2000 ng/g. The best response, as determined by the size of stripping areas, was obtained with an electrode prepared with mercury but without mercury ions in the electrolyte. Lead is analysed by a freshly polished glassy-carbon electrode in 0.09-0.1 mol/L HCl while the analysis of zinc requires an electrode activation procedure. The electrode activation is performed by stripping zinc in an electrolyte containing 0.1 mol/L HCl and 2 μg/g Zn2+ and electrolysis at - 1400 mV (SCE). The concentration range of linear response occurs where the electrode is not fully covered by metal clusters during the electrolysis step. The influence of mercury is investigated and a model is proposed which explains the co-deposition of mercury and test metals in the electrolysis step in terms of a chargedistribution parameter. The model explains that the decrease of stripping peak area, as a function of concentration, is entirely due to mercury ions being simultaneously reduced together with the ions of the test metal in the electrolysis step. The influence of hydrogen evolution and oxygen reduction together with possible improvements of the method are discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 526-532 |
| Number of pages | 7 |
| Journal | Fresenius' Journal of Analytical Chemistry |
| Volume | 359 |
| Issue number | 7-8 |
| DOIs | |
| Publication status | Published - Jan 1 1997 |
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All Science Journal Classification (ASJC) codes
- Biochemistry
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Investigation of mercury-free Potentiometric Stripping Analysis and the influence of mercury in the analysis of trace elements lead and zinc. / Andersen, Jens E.T.; Andersen, Laust.
In: Fresenius' Journal of Analytical Chemistry, Vol. 359, No. 7-8, 01.01.1997, p. 526-532.Research output: Contribution to journal › Article
TY - JOUR
T1 - Investigation of mercury-free Potentiometric Stripping Analysis and the influence of mercury in the analysis of trace elements lead and zinc
AU - Andersen, Jens E.T.
AU - Andersen, Laust
PY - 1997/1/1
Y1 - 1997/1/1
N2 - The application of Potentiometric Stripping Analysis (PSA), without any mercury, to the determination of trace elements lead and zinc, results in linear responses between stripping-peak areas and concentrations within 0 to 2000 ng/g. The best response, as determined by the size of stripping areas, was obtained with an electrode prepared with mercury but without mercury ions in the electrolyte. Lead is analysed by a freshly polished glassy-carbon electrode in 0.09-0.1 mol/L HCl while the analysis of zinc requires an electrode activation procedure. The electrode activation is performed by stripping zinc in an electrolyte containing 0.1 mol/L HCl and 2 μg/g Zn2+ and electrolysis at - 1400 mV (SCE). The concentration range of linear response occurs where the electrode is not fully covered by metal clusters during the electrolysis step. The influence of mercury is investigated and a model is proposed which explains the co-deposition of mercury and test metals in the electrolysis step in terms of a chargedistribution parameter. The model explains that the decrease of stripping peak area, as a function of concentration, is entirely due to mercury ions being simultaneously reduced together with the ions of the test metal in the electrolysis step. The influence of hydrogen evolution and oxygen reduction together with possible improvements of the method are discussed.
AB - The application of Potentiometric Stripping Analysis (PSA), without any mercury, to the determination of trace elements lead and zinc, results in linear responses between stripping-peak areas and concentrations within 0 to 2000 ng/g. The best response, as determined by the size of stripping areas, was obtained with an electrode prepared with mercury but without mercury ions in the electrolyte. Lead is analysed by a freshly polished glassy-carbon electrode in 0.09-0.1 mol/L HCl while the analysis of zinc requires an electrode activation procedure. The electrode activation is performed by stripping zinc in an electrolyte containing 0.1 mol/L HCl and 2 μg/g Zn2+ and electrolysis at - 1400 mV (SCE). The concentration range of linear response occurs where the electrode is not fully covered by metal clusters during the electrolysis step. The influence of mercury is investigated and a model is proposed which explains the co-deposition of mercury and test metals in the electrolysis step in terms of a chargedistribution parameter. The model explains that the decrease of stripping peak area, as a function of concentration, is entirely due to mercury ions being simultaneously reduced together with the ions of the test metal in the electrolysis step. The influence of hydrogen evolution and oxygen reduction together with possible improvements of the method are discussed.
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U2 - 10.1007/s002160050626
DO - 10.1007/s002160050626
M3 - Article
VL - 359
SP - 526
EP - 532
JO - Fresenius Zeitschrift fur Analytische Chemie
JF - Fresenius Zeitschrift fur Analytische Chemie
SN - 0016-1152
IS - 7-8
ER -