基于亨利定律的水中臭氧浓度检测方法研究

Research on Detection Method of Ozone Concentration in Water Based on Henry’s Law

为提高水中臭氧(O_(3))浓度检测方法的普适性、准确性和便捷性,提出了一种新的非接触式的水中O_(3)浓度检测方法。基于亨利定律(Henry’s Law),采用电化学方法,建立空气中O_(3)浓度与水中O_(3)浓度的回归方程,从而推导出水中O_(3)浓度。实验结果显示,水体O_(3)传感器的检出限为0.02 mg/L,检测上限为0.40 mg/L,可决系数R~2为0.998 9,相对误差最大值为7.05%,相对标准偏差最大值为2.82%。实际样品检测显示,水体O_(3)检测传感器的检测结果与O_(3)快速测定试剂盒(DPD法)的检测结果完全吻合。该方法不但综合了智能传感器的小型化、网络化、实时测量等特性,而且结构简单、成本低、响应快,适用于水体中O_(3)浓度的快速检测。

In order to improve the universality,accuracy and convenience of the methods to detect the concentration of ozone in water,a new non-contact method for the determination of ozone in water was proposed in this paper.Based on the Henry’s law and electrochemical method,the regression equation of“ozone concentration in air-ozone concentration in water”was established,and the ozone concentration in water was deduced.The results showed that the detection limit of ozone sensor in water was 0.02 mg/L,the upper detection limit was 0.40 mg/L,the coefficient of determination R2 is 0.9989,the maximum value of relative error was 7.05%,the maximum value of RSD was 2.82%.Actual sample test results showed that the data measured by the water ozone detection sensor were in complete agreement with the data measured by the DPD ozone rapid determination kit.This method not only integrated the advantages of intelligent sensor technology,such as miniaturization,networking,real-time measurement,etc.,but also had low cost,simple structure,fast response time,and was suitable for the rapid detection of ozone concentration in water.