MASS MEASUREMENTS BY AN ACCURATE AND SENSITIVE SELECTED-ION RECORDING TECHNIQUE

Trace-level components of mixtures were successfully identified or confirmed by mass spectrometric accurate mass measurements, made at high resolution with selected ion recording, using GC and LC sample introduction. Measurements were made at 20 000 or 10 000 resolution, respectively. Under these conditions, accurate mass determinations from magnet or accelerating potential-electrostatic sector scans would not be feasible. Chlorinated diphenyl sulfides, aralkylamine lubricant additives, and a sulfonated azo dye were analyzed with mass measurement errors of less than 5 ppm.