| Autor: |
Lind, B., Bigras, L., Cernichiari, E., Clarkson, T., Friberg, L., Hellman, M., Kennedy, P., Kirkbride, J., Kjellström, T., Ohlin, B. |
| Zdroj: |
Fresenius' Zeitschrift für Analytische Chemie; 1988, Vol. 332 Issue 6, p620-622, 3p |
| Abstrakt: |
A quality control programme for mercury determinations in hair was developed within a study of 'Mental effects of prenatal methylmercury exposure in New Zealand children'. Hair was obtained from seven females with a mercury concentration of about 0.5-4 μg Hg/g. The hair was cut into 1-5 cm pieces and pulverized by liquid nitrogen grinding using a ring mill. In order to obtain a series of QC samples with varying Hg concentrations, different amounts of powder from all the samples and a reference sample of pulverized hair (11.2 μg Hg/g) were mixed using a Braun Mikrodismembrator II. To eliminate static electricity when weighing the material, an alpha-ionization unit, Po210 was placed close to the pan within the analytical balance. The mercury concentrations in the original samples and the mixtures were determined by radiochemical neutron activation analysis (RNAA), at the Swedish Environmental Research Institute. In total four laboratories participated in the interlaboratory comparison. All laboratories used the cold vapor AAS technique and Hg monitor model 1235, LDC for determinations after wet digestion of the samples. The accuracy of RNAA was established using the Ispra reference hair sample T4 and the IAEA reference hair sample HH1. There was good agreement between found and expected Hg values for the hair mixtures. Following the first rounds of analyses, two laboratories showed analytical improvements after introduction of a Po-210 unit into the chamber of the analytical balance. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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