Accuracy of analytical standard solutions and the uncertainty in their nominal concentrations
In the last step of the analysis, the accuracy of analytical standard solutions has a decisive influence on the measurement results of pesticide residues, as well as all other chemical contaminants, and, in the case of actual concentrations differing from nominal ones, can result in a systematic err...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
WESSLING Nemzetközi Kutató és Oktató Központ Közhasznú Nonprofit Kft.
Budapest
2017
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| Sorozat: | Élelmiszervizsgálati közlemények
63 No. 1 |
| Kulcsszavak: | Élelmiszervizsgálat - módszer, Élelmiszerkémia - módszer, Növényvédőszerek - kémiai analízis - mérés, Élelmiszerbiztonság |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/79131 |
| Tartalmi kivonat: | In the last step of the analysis, the accuracy of analytical standard solutions has a decisive influence on the measurement results of pesticide residues, as well as all other chemical contaminants, and, in the case of actual concentrations differing from nominal ones, can result in a systematic error during the determination of sample components. Therefore, most of the laboratories who feel responsible for their results pay special attention to the preparation and storage of standard solutions, and to replenishing solvent losses due to possible evaporation, based on the mass measurements of vessels storing standard solutions before and after use. However, in our experience, much less attention than necessary is paid in practical work to monitoring the possible decomposition of individual active ingredients, and not appropriate statistical methods are used for the evaluation of the monitoring results. In our article, we present the standard preparation methods of two laboratories employing “good analytical practices”, analyze the uncertainties of the different steps, and make a recommendation for the preparation of the most accurate standard solutions. |
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| Terjedelem/Fizikai jellemzők: | 1414-1421 |
| ISSN: | 0422-9576 |