Simultaneous microdetermination of fluorine, chlorine, bromine and sulfur in organic compounds by ion chromatography

Determination of fluorine, chlorine, bromine and sulfur in organic compounds by means of Schoniger technique coupled with Ion chromatography has been newly performed. By using standard organic compounds, we have succeeded in suppressing the background of nitrogen oxide and carbon dioxide. Especially the values of fluorine and chlorine have much improved in accuracy. A great number of samples having these atoms in the same molecules need to be analyzed simultaneously. We synthesized the standard organic compounds with both atoms in the molecules. The curve response of each standard sample is limited by the ratio of the atomic composition. To determine unknown samples or compounds that have large differences in composition, it is better to use the suitable linear calibration curves for the respective compositions. For that reason we made three different calibration curves using compounds having different ratios of atomic compositions. An automatic selecting program was devised to select the proper calibration curve from those three. The total performance gave highly accurate results and was highly efficient and practical for determinations of a large number of samples containing compounds with many elements.