ANALYSIS OF NITROSAMINES 303 ILl c-• z i ( i 4 8 12 16 20 TIME (minutes) Figure 8. HPLC-TEA chromatogram of N-nitrosodipropylamine (NDPA), N-nitrosodiethylamine (NDEA), N-nitrosodimethylamine (NDMA) on IxPorasil with 76:23:1 (v/v/v) hexane-methylene chloride- acetonitrile. Flow rate: 1 ml/min. (Reprinted with permission from reference 27. Copyright 1979 Interna- tional Scientific Communications, Inc.)
304 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS 4 8 'lIME {minutes} Figure 9. HPLC-TEA chromatogram of N-nitrosodiethanolamine (NDELA) and N-nitrosodiisopropa- nolamine (NDIPA) on NH2-bonded phase with 3:97 (v/v) methanol-methylene chloride. Flow rate: 1 ml/min. (Reprinted with permission from reference 27. Copyright 1979 International Scientific Communi- cations, Inc.)
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