| Autor: |
Divis, Pavel, Reichstädter, Marek, Habartová, Aneta, Kříkala, Jakub |
| Přispěvatelé: |
Chemistry, Analytical, Environmental & Geo-Chemistry, Faculty of Sciences and Bioengineering Sciences |
| Jazyk: |
angličtina |
| Rok vydání: |
2018 |
| Popis: |
The diffusive gradient in thin films technique (DGT) has become a routine tool for speciation analysis of metals in natural waters, sediments and soils. Since its introduction in 1994, more application possibilities appeared. At present, more than 50 elements can be analysed by DGT, and studies have also been carried out to explore the use of this technique for mercury determination. In this work, the possibility to use the DGT technique for the determination of mercury in fish sauces was studied. The preparation of a new sorption gel has been tested. After optimization of sorption gel preparation, this new gel was inserted into the plastic DGT sampling unit together with agarose diffusive gel and cellulose filter membrane and correct function of DGT technique was tested in a model solution containing 20 g.l-1 of mercury and 0.01 mol.l-1 NaCl. Mass of mercury accumulated in sorption gel and mercury concentration in model solution was analysed by AAS technique using AMA-254 instrument (Altec, Czech Republic).Mass of mercury accumulated in the sorption gel linearly increased with the increasing exposure time, which confirms the correct function of DGT. The repeatability of the measurement expressed as the relative standard deviation was 8 %. As the fish sauce is food with high salt content, the effect of the salt content in the solution on the DGT measurement has been tested. Salt concentration up to 50 g.l-1 did not affect the correct function of the DGT technique. The effective diffusion coefficient under the tested conditions was calculated to be 6.23 x 10-6 cm2.s-1. Finally, the DGT technique was used for the analysis of mercury in fish sauce sample. The determination showed the advantage of the DGT technique to separate the analyte from the complex matrix and to detect very low concentrations of mercury. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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