Abstract: Organic phosphorus sensor has been instrumented with P.V.C as mem brane Carrier mixed with the phosphate andthe electric sensitive matter of organic phosphorus as active component. We have tested the sensor characteristics: the response-time was short (≤20s), the detection minimum is lower than 0.1×10-6 and the selectivity coefficient is lower than 0.1. It wasa kind of convenient and speedy determination instrument for assaying crganic phosphorous pesticides.

Key words: organ phosphorus sensor, selectivity coefficient, detection minimum