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1

Determining thallium in a commercial tobacco brand available in Poland

100%
Karbowska B., Zembrzuski W.
Polish Journal of Environmental Studies
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2016
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tom 25
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nr 5
This study focused on determining thallium content in tobacco samples collected from a commercial cigarette brand commonly available in Poland (manufactured by Philip Morris). The samples were analyzed with the use of differential pulse anodic stripping voltammetry (DPASV) coupled with a flow injection analysis (FIA) system. The obtained results confirmed that thallium was present in the studied tobacco samples (average content at 0.0089 ±0.0012μg/g). These findings suggest that cigarette smokers in Poland may be exposed to the toxic effects of thallium-based compounds present in tobacco.
2

Ocena zawartości talu w wytypowanym przez wielkopolskich studentów - na podstawie ankiety - napoju energetyzującym

100%
Karbowska B., Zembrzuski W.
Bromatologia i Chemia Toksykologiczna
|
2015
|
tom 48
|
nr 2
3

Sorption of thallium on walnut shells and its enhancement by the lignosulfonate-stabilized gold colloid

81%
Karbowska B., Konowal E., Zembrzuski W., Milczarek G.
Polish Journal of Environmental Studies
|
2019
|
tom 28
|
nr 4
The adsorption behavior of walnut shells in the presence of colloidal gold for thallium(I) ions from aqueous solution was investigated. The thallium content in the samples before and after contact with walnut shells was determined by differential pulse anodic stripping voltammetry. The adsorption capacity was studied in relation to the function of equilibrium time, the amount of adsorbent, the concentration of thallium, and pH. For the sake of comparison, the sorptive properties of walnut shells were compared to soapnut powder. The obtained results clearly indicate that both walnut shells and soap nuts are effective sorbents for thallium(I) ions (removal efficiency over 90%). The best results of sorption were achieved at pH = 7.5 after contact time of 30 min. The addition of colloidal gold stabilised by lignosulfonate as the co-adsorber enhances the sorption ability of walnut shells to over 99%.
4

Application of voltammetry to determine vitamin C in apple juices

80%
Wawrzyniak J., Ryniecki A., Zembrzuski W.
Acta Scientiarum Polonorum. Technologia Alimentaria
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2005
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tom 04
|
nr 2
The cyclic voltammetric method, which is based on the redox properties of ascorbic acid, was adopted to determine the concentration of vitamin C in apple juices. Recorded on voltammograms, the oxidation current of ascorbic acid was linearly dependent on the ascorbic acid concentration (a linear calibration curve was found in the range of up to 150 mg ascorbic acid/100 cm3 solution). The standard addition technique was used to determine the ascorbic acid concentration. To verify results, the titrimetric method was used. Differences between concentrations of vitamin C determined using the cyclic voltammetric and titrimetric methods are lower than 1 mg (in comparison to concentrations of ascorbic acid about 50 mg/100 cm3 of juice). The method - easy for automation - can be used directly without special preparation of studied apple juices samples before measurement of the vitamin C concentration.
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