Rapid detection system for pesticide residue in water quality

The invention provides a rapid detection system for pesticide residue in water quality. The rapid detection system comprises a first operational amplifier, a second operational amplifier, a light-emitting diode, a first potentiometer, a voltage stabilizer, a probe and a first resistor, wherein the operational amplifiers both use LM324, an output voltage of the A1 is between 0V and 4V with the change of light intensity by adjusting the W1, the probe T is made of two metal sheets, the resistance between the two metal sheets is changed with the numbers of ions in water when the probe is placed inthe water, the output of the A2 is also correspondingly changed and is adjusted and output by the W2, the A3 and the A4 form a window comparator, the window range is decided by the W3 and the W4, a display result is displayed by external digital display after detection, and the pesticide residue in the water quality can be obtained according to floating data of water ions. The detection effect isgood and the detection sp