| Autor: |
Motojima, Kenji, Tatenuma, Katsuyoshi, Uchino, Kouichi, Yonetani, Akira |
| Zdroj: |
Analytical Sciences; June 1988, Vol. 4 Issue: 3 p287-291, 5p |
| Abstrakt: |
A new and simple method for the determination of ppt (ng/l) levels of cobalt in aqueous samples is described. The method involves the extraction of cobalt into m-xylene as its 2-nitroso-1-naphthol chelate, followed by elimination of the other metals and the excess reagent extracted in the m-xylene by the successive washing with hydrochloric acid and sodium hydroxide solution. Finally the cobalt in the m-xylene is determined by graphite furnace atomic absorption spectrometry. Since the formation and extraction properties of cobalt 2-nitroso-naphthol chelate are specific and selective, the resulting m-xylene contains only the cobalt chelate. More than 2 ng of cobalt in 1 l of aqueous sample (2 ppt) can be accurately determined without the effects of many other substances. |
| Databáze: |
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| Externí odkaz: |
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