Study of chemical modifiers for the determination of chromium in biological materials by tungsten coil electrothermal atomic absorption spectrometry
| Autor: | José Y. Neira, Margarita Darder, Joaquim A. Nóbrega, Carlos G. Bruhn, M. I. Guzmán |
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| Rok vydání: | 1999 |
| Předmět: |
medicine.diagnostic_test
Analytical chemistry chemistry.chemical_element Chemical modification Tungsten Ascorbic acid Biochemistry law.invention Chromium Certified reference materials chemistry law Spectrophotometry medicine Atomic absorption spectroscopy Graphite furnace atomic absorption Nuclear chemistry |
| Zdroj: | Fresenius' Journal of Analytical Chemistry. 364:273-278 |
| ISSN: | 1432-1130 0937-0633 |
| DOI: | 10.1007/s002160051337 |
| Popis: | The determination of Cr in digest solutions of mussels and non-fat milk powder by tungsten coil electrothermal atomic absorption spectrophotometry (TC-ETAAS) is affected by interferences. This study reports a critical evaluation of chemical modifiers that could be employed to correct these interferences. The chemical modifiers tested were: Mg [as Mg(NO3)2], Pd [as Pd(NO3)2], NH4NO3, ascorbic acid, and mixtures of these compounds. The less effective modifier was NH4NO3. The best effects, considering thermal stabilization and sensitivity, were obtained in mixtures of ascorbic acid plus Mg. Chromium was determined by TC-ETAAS in certified reference materials of mussels and non-fat milk powder, and results were comparable with those obtained by graphite furnace atomic absorption spectrophotometry (GFAAS). |
| Databáze: | OpenAIRE |
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