ALS (acidic lithium sulphate) decomposition method (part iv) Kjeldahl determination of nitrogen in heterocyclic ring compounds containing nitrogennitrogen bond.
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.
Yoshikuni
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Laboratory for Analytical Chemistry, Faculty of Engineering, Chiba University, Yayoi-cho, Chiba, Japan.