Interfacing of analytical instrumentation to small computers for the purpose of on-line data acquisition has now become almost standard practice in the modern chemistry laboratory.

An effort has been made to assess the potential utility of derivative spectrometry for the quantitative analysis of mixtures. Using a numerical simulation method based on pairs of overlapping Gaussian bands, we have determined the systematic and random errors of measurement methods based on the Oth, 1st, and 2nd derivatives of a number of band pairs of different height ratio, width ratio, and separation. Derivative methods were found to give the lowest total errors in most of the cases studied.

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