Electrochemical Modification of a Graphite Platform for a Solid Sampling Electrothermal Atomic Absorption Spectrometry of Mercury
Autor: | Josef Komárek, Marie Konečná, Hana Zelinková, Rostislav Červenka |
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Rok vydání: | 2010 |
Předmět: |
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Analytical chemistry chemistry.chemical_element 02 engineering and technology Iridium 01 natural sciences Analytical Chemistry law.invention law Solid phase extraction Detection limit Electrolysis Aqueous solution Chemistry Spectrophotometry Atomic Solid Phase Extraction 010401 analytical chemistry Electrochemical Techniques Mercury 021001 nanoscience & nanotechnology Electroplating 0104 chemical sciences Mercury (element) Calibration Environmental Pollutants Graphite Gold 0210 nano-technology Atomic absorption spectroscopy Palladium |
Zdroj: | Analytical Sciences. 26:989-993 |
ISSN: | 1348-2246 0910-6340 |
Popis: | An electrodeposited palladium and iridium/gold mixture has been investigated as a chemical modifier for mercury determination in environmental samples by solid sampling electrothermal atomic absorption spectrometry. Electrochemical procedures of platform surface modification performed in a cell with 20 ml of solution, and in a drop of modifier solution have been optimized. Simple electrolysis in a drop was found to be the most consistent, taking the reproducibility as the major criterion. A total mass of 250 µg of electrodeposited palladium or an iridium/gold mixture was used. The lifetime of 60 - 70 firings for a deposited iridium/gold mixture was smaller than that for palladium with a lifetime of 100 - 120 firings. The detection limit was 120 pg Hg. Different sample masses of between 0.1 and 10 mg were weighed into modified platforms according to the mercury content. The results obtained for mercury in environmental samples as soils, sediments and plant, using solid sampling and calibration against aqueous standards stabilized by potassium permanganate, were in good agreement with those achieved by using the thermal deposition of modifiers and with measurements by pyrolysis atomic absorption spectrometry with gold amalgamation. |
Databáze: | OpenAIRE |
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