| Water security plays an important role in the development of human society. With the development of testing technology and the upgrading of the instrument, People can solve the water safety problem more efficiently. Chloride is closely related to human production activities. It is dangerous to human health and industry equipment when the concentration exceeds the limit.Firstly, the principle of the silver nitrate turbidity method is studied in this paper. By comparing the characteristics of nephelometry and transmission turbidimetry, we decided to use the nephelometry is chosen to replace the transmission turbidity. Moreover, the corresponding mathematical expression is built here. According to this, a simple measuring device including power for supply LED, photodiode detection and current voltage conversion amplification circuit, data acquisition and calculation module, optical structure for ensuring beam collimation and the mechanical structure for fixing photoelectric conversion system is designed in this paper. In order to improving the measurement accuracy, the parameters which led driver circuit and transconductance amplifier circuits are significantly analyzed and calculated.The stability of silver chloride suspension is the key to accurately measure the chloride ion. The trial experiments are adopted to find the optimal conditions, which ensure the suspension keeps stable within the given time. Otherwise, the turbidimeter is used to verify the stability of the scattered lightsignals under the optimal experimental conditions.Finally, we calibrating the instrument and the performance of chlorion detection instrument is given. According to the result, it has good stability and repeatability. |
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