Abstract: A data processor for chromatography operates to separately recognize the peaks of a composite peak of a chromatogram. At first, in order to separate the peaks, the maximum point of the peak of the chromatogram is determined, and extrapolation lines are drawn from said maximum point to the individual points of the chromatogram, and then the gradients of the lines changing from the minimum to the maximum are determined. By determining the changes of the gradients of the extrapolation lines and intersection points of the extrapolation lines and the chromatogram, the major and minor peak are separated so that the shoulder peak can be judged remarkably accurately.

Abstract: The data processing apparatus according to this invention comprises a microprocessor and a dot printer. The printer is of such a type that the printing paper is stepwise advanced each time a line of characters are printed. The analog signal from the detector of a chromatograph is converted to a corresponding digital signal. A block of data values to be printed on one line, separated from the digital signal corresponding to the waveform pattern varying with time, is stored in a print buffer memory. The stored data values are printed out in dot matrix form. The emptied buffer memory then stores another block of data values to be plotted on the next line. Thereafter, the plotting and storing operations are repeated until a chromatogram is completed. The concentrations of the components corresponding to the peaks of the chromatogram are also calculated by processing the digital signal and the result of the calculation is printed out in the form of characters each composed of plural dots by the same printer.