抄録
Quantitative determinations of homologous impurities contained in purified and impurified potassium 5, 8-diisopropyl-2-naphthalenesulfonate [KDNS] by means of GLC and MS were investigated, after KDNS was converted to methyl ester [MeDNS].
The GLC method was unadaptable to determining the homologous impurities because of peaks of the homologues were overlapped each other. On the contrary, MS method determined by In-beam EI method under an electron beam energy of 20eV was useful for these determinations, and lower limits of determination on the homologues contained in MeDNS were estimated as 0.2mol%. As the results, it was recognized that the purified KDNS which have been used hitherto in our studies was of purity over 99.8mol% with respect to the homologues.
