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Kinetic micro determination of mercury in natural waters and biological materials

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Summary

A wet digestion has been developed to prepare water and biological samples for a kinetic determination of mercury using an iodide-catalyzed reaction between cerium(IV) and arsenite(III). A mercury-free control, prepared using ion-exchange with a selective chelating resin, was used by adding mercury standards to make a calibration curve. Both inorganic and organic mercury can be determined by the method described either in water or biological samples containing mercury in the range of 0.05 to 2.0μg per ml. The procedure can be used satisfactorily down to the 0.05-ppm level for fresh water and urine with an overall error of less than 5 %. The method can also be employed for the determination of mercury in sea water or blood serum with an error of 10 % or less and gives results which compare favourably with other procedures.

Zusammenfassung

Die nasse Veraschung zur Aufbereitung von Wasserproben und von biologischem Material für die kinetische Quecksilberbestimmung mit Hilfe der jodkatalysierten Cer-Arsenit-Reaktion wurde beschrieben. Durch Ionenaustausch an einem selektiven Harz wurde eine quecksilberfreie Vergleichsprobe hergestellt. Diese diente nach Zusatz bekannter Quecksilbermengen zur Ermittlung einer Eichkurve. Anorganisches und organisch gebundenes Quecksilber kann nach diesem Verfahren in Wasser oder biologischem Material im Bereich zwischen 0,05 und 2,0μg/ml bestimmt werden. Für die Größenordnung von 0,05 ppm kann das Verfahren für frisches Wasser und für Harn mit einem durchschnittlichen Fehler unter 5% verwendet werden. Ebenso dient es zur Untersuchung von Meerwasser und Blutserum mit einem Fehler bis zu 10%. Die Ergebnisse stehen mit denen anderer Methoden in gutem Einklang.

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Ke, P.J., Thibert, R.J. Kinetic micro determination of mercury in natural waters and biological materials. Mikrochim Acta 61, 417–427 (1973). https://doi.org/10.1007/BF01218173

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