“…Computerization of carbon, hydrogen, and nitrogen determinations using the automated apparatus has become a general practice in analytical laboratories where large numbers of samples are processed daily. Bramstedt et al (3) reported on the statistical evaluation of the data and found that operator error was not a major factor in the total random errors; they also put forward a closed-loop system based on a Perkin-Elmer CHN analyzer, including electronic weighing and transfer of samples from a Mettler balance and preparation of formalized reports (4). Pella et al (5) proposed calibration equations to improve accuracy using the Carlo Erba analyzer.…”