Summary
A method for the determination of cobalt in steel with 2-(2-thi-azolylazo)-4-methyl-5-(sulfomethylamino) benzoic acid (TAMSMB) is proposed. Iron and manganese were previously removed by the extraction from 7M HCl into methyl isobutyl ketone and with an anion exchange column (Diaion SA # 100), respectively. The results of the analyses of steel samples were in good agreement with those by atomic absorption spectrophotometry. This method was compared with the methods using the highly sensitive reagents for cobalt; 4-(5-chloro-2-pyridylazo)-1,3-diaminobenzene(5-Cl-PADAB), 5-(3,5-dibromo-2-pyridylazo)-2,4-diaminotoluene (3,5-diBr-PADAT), 2-(5-bromo-2-pyridylazo)-5-(diethylamino) phenol(5-Br-PADAP), 2-(2-py-ridylazo)-4-methyl-5-(ethylamino) phenol (EAPAC), 2-(3,5-dibromo-2-pyridylazo)-5-(dimethylamino) benzoic acid (3,5-di-Br-PAMB), 3-(2-thiazolylazo)-2,6-diaminotoluene (2,6-TADAT), and 2-nitroso-5-dimethylaminophenol (Nitroso-DMAP).
Zusammenfassung
Ein Verfahren zur Kobaltbestimmung in Stahl mit TAMSMB wurde vorgeschlagen. Fe und Mn werden vorher durch Extraktion mit 7M Salzsäure in IMBK bzw. mit einer Anionenaustauschsäule (Diaion SA 100) entfernt. Die Ergebnisse der Stahlanalysen stimmen mit denen durch Atomarabsorption gut überein. Das Verfahren wurde verglichen mit den Ergebnissen bei Anwendung hochempfindlicher Reagenzien für Kobalt.
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Wada, H., Ishizuki, T., Kodama, H. et al. Spectrophotometric determination of cobalt in steel with 2-(2-thiazolylazo)-4-methyl-5-(sulfomethylamino) benzoic acid (TAMSMB). Mikrochim Acta 80, 139–149 (1983). https://doi.org/10.1007/BF01204592
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DOI: https://doi.org/10.1007/BF01204592