ALS (acidic lithium sulphate) decomposition method (part iv) Kjeldahl determination of nitrogen in heterocyclic ring compounds containing nitrogennitrogen bond |
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Authors: | Yoshikuni N |
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Affiliation: | Laboratory for Analytical Chemistry, Faculty of Engineering, Chiba University, Yayoi-cho, Chiba, Japan. |
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Abstract: | Heterocyclic ring compounds containing nitrogennitrogen bonds such as 1H-1,2,4 triazole, 2,4,6 trimethylbenzenesulfonyltriazolide and pyridazine can be completely decomposed in the molten state with mixtures of various ratios of concentrated sulphuric acid and lithium sulphate (molten ALS) flux containing a catalyst such as silver sulphate. The quantitative recovery of nitrogen in the above three compounds with the molten ALS flux decomposition system can be obtained by the Kjeldahl method. |
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