电化学探头法溶解氧仪线性核查方法探究

Research on linear verification of electrochemical probe dissolved oxygen meter

电化学探头法测定水中溶解氧因其测量方便快速,结果稳定,数据准确,干扰少等优点而广泛应用在地表水、地下水及生活污水的监测中。根据《水质溶解氧的测定电化学探头法》(HJ 506-2009)标准10.2线性检查章节要求,新仪器投入使用前、更换电极或电解液以后,应检查仪器的线性,一般每隔2个月进行一次线性检查。由于标准并未明确线性核查应该采取何种检验模型进行判断,导致监测人员在实施过程中存在理解偏差,影响核查效果。因此本文通过对几种线性检查模型的效果进行比对分析,希望选出最优方法。

The electrochemical probe method for the determination of dissolved oxygen in water is widely used in the monitoring of surface water, groundwater and domestic sewage due to its advantages of easy operation,stable results, accurate data and less interference factors. According to the " Electrochemical Probe Method for the Determination of Dissolved Oxygen in Water "( HJ 506-2009 Standard 10.2), the linearity of the instrument should be checked before the new instrument is put into use and after the electrode or electrolyte is replaced.Generally, the linearity check should be carried out every two months. However, the standard does not specify what kind of test model should be adopted for linear verification, which leads to the divergence of models used during the verification, thus affecting the results. Therefore, this paper compares and analyzes the effects of several linear inspection models, hoping to select the optimal method.