“…The best possible precision that can be obtained under the most favorable conditions is 0.1 % for major components in near-ideal samples, increasing to ~ 10 % below the 10 ppm level. (57) Identification of chromatographic effluents is most definitively accomplished by coupling to a mass spectrometer. Virtually every instrumental method of analysis, however, has been employed either on-line or off-line for peak identification.…”