A MULTICHANNEL PHOTOMETRIC DETECTOR FOR MULTICOMPONENT ANALYSIS IN FLOW-INJECTION ANALYSIS

The detector, a multi-channel photometric detector, described in this paper was developed using multi-wavelength LEDs (light emitting diode) and phototransistors for absorbance measurement controlled by an Inte l 8031 8-bit single chip microcomputer. Up to four flow cells can be a ttached to the detector. The LEDs and phototransistors are both inexpe nsive, and reliable. The results given by the detector for simultaneou s determination of trace amounts of cobalt and cadmium in zinc sulphat e electrolyte are reported. Because of the newly developed detector, t his approach employs much less hardware apparatus than by employing co nventional photometric detectors.