Method for monitoring heavy metal ions concentration in solution

The invention relates a method for monitoring heavy metal ions concentration in solution, comprising the following steps: adding methylisobutylketone containing 1-n-butyl-3-methylimidazolehexafluorophosphate and dithizone in the liquid storage tank of a chemical dropping electrode, connecting the chemical dropping electrode with an electrochemical work station, sucking the solution to be detectedinto a flow injector, starting the flow injector, controlling the droplet size on the top of a glass dropper, measuring the heavy metal ions concentration, and changing droplet after every measurement. The invention can effectively improve the stability and sensitivity of the measurement, the operation is easy and fast and the aim of on-line monitoring can be finally achieved; the electrode surface can be updated continuously without worrying the problem that the electrode is polluted by the material to be detected, the electrode size can be accurately controlled and the detecting stability is good.