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Titolo:
DEMETHYLATION OF METHYLMERCURY DURING INORGANIC MERCURY DETERMINATIONBY THE MAGOS COLD VAPOR ATOMIC-ABSORPTION TECHNIQUE
Autore:
LIND B; HOLMGREN E; FRIBERG L; VAHTER M;
Indirizzi:
KAROLINSKA INST,INST ENVIRONM MED,BOX 210 S-17177 STOCKHOLM SWEDEN
Titolo Testata:
Fresenius' journal of analytical chemistry
fascicolo: 12, volume: 348, anno: 1994,
pagine: 815 - 819
SICI:
0937-0633(1994)348:12<815:DOMDIM>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
14
Recensione:
Indirizzi per estratti:
Citazione:
B. Lind et al., "DEMETHYLATION OF METHYLMERCURY DURING INORGANIC MERCURY DETERMINATIONBY THE MAGOS COLD VAPOR ATOMIC-ABSORPTION TECHNIQUE", Fresenius' journal of analytical chemistry, 348(12), 1994, pp. 815-819

Abstract

Previous animal experiments suggested that the Magos cold vapor atomic absorption spectroscopic (CVAAS) method might overestimate the concentrations of inorganic mercury (I-Hg) in the presence of methylmercury(MeHg). In the present study it is shown that this error is due to a fast degradation of MeHg during the formation of the analytical signal. For brain samples, about 5% of the total amount of MeHg in the reaction vessel is degraded to I-Hg. Speciation of Hg in aqueous solution of MeHg chloride, after purification with ion-exchange chromatography using the Magos method, showed that about 9% was I-Hg. Analysis by NMR of MeHg chloride and MeHg hydroxide showed that less than 1% was in the form of I-Hg. The absolute magnitude of the error in the CVAAS method is dependent on the amounts of SnCl2 and MeHg in the reaction vessel; however, the ratio of I-Hg to total (T-Hg) is shown to be independent of the amount of MeHg (25.5 - 255 ng as Hg) in the reaction vessel. A procedure for corrections is proposed, based on the results from these studies and empirical data from speciation analyses of brain tissuefrom MeHg-exposed rats and rabbits.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 16:00:41