APPLICATION OF THE PHOTOIONIZATION DETECTOR FOR SINGLE DETERMINATIONSOF HYDRIDE FORMING ELEMENTS

The application of a photoionization detector in conjunction with a fl ow-through system is described for the determination of arsenic, antim ony, selenium, tellurium, bismuth, tin, sulfide and ammonia. The analy tical procedure is based upon a preliminary generation of the hydride compounds, their subsequent transfer to the gas phase and finally thei r detection in the photoionization detector. Linear calibration curves were obtained over three to four orders of magnitude with the followi ng 3s-detection limits: 4 ng/ml As, 0.3 ng/ml Sb, 0.5 ng/ml Se, 3.0 ng /ml Te, 0.1 mug/ml Bi, 0.5 mug/ml Sn, 10.0 ng/ml S2-, 0.5 mug/ml NH3.