Rapid detection of pesticide residues in vegetables with mini-colorimeter

This paper describes a rapid pesticide residues detection method for vegetable samples or water samples based on a mini-colorimeter. The sensors responding signal and condition circuit of the mini-colorimeter are composed of emitting diodes, photodiode receivers and integrated circuit amplifiers. Single chip microprocessor is the core of the system. The concentration (PPM) of pesticides is displayed by 4 nixietubes. A neural network mathematic model is established to calculate the residual concentration of the pesticides. The neural network weigh matrixes are trained with supervised samples of 0-6 PPM omethoate and Chlorsalicylamide. The pesticide residues are detected for greengrocery samples. Using this meter, it takes one minute to measure the organophosphates pesticide residues in a greengrocery sample or Chlorsalicylamide in water sample. This meter can be used in other pesticides detection with the help of suitable chromogenic agents.