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基于Fenton试剂和微型光谱仪,实现了水质化学需氧量(chemical oxygen demand,COD)和总磷(total phosphorus,TP)的在线测定。该系统结合超声辅助,基于Fenton试剂实现了常温常压下水中有机化合物和有机磷化合物的在线消解。系统基于微型光谱仪实现了可见光光谱探测并采用多波长分光光度法分析光谱数据。结果表明,系统具有测定时间短,低功耗,结构简单和二次污染少的优点。同时,系统测定相对误差小于10%,COD和总磷检测限分别为2和0.008mg·L~(-1),灵敏度分别为0.021 3和0.452 6,标准偏差分别为5.6%(15.0mg·L~(-1) COD标样)和5.8%(0.010mg·L~(-1)总磷标样)。实际水样测定结果与国家标准分析方法比较无显著差异。
Based on the Fenton reagent and micro spectrometer, on-line determination of chemical oxygen demand (COD) and total phosphorus (TP) was achieved. The system combined with ultrasound-assisted real-time digestion of organic compounds and organophosphorus compounds in water at room temperature and pressure based on Fenton’s reagent. The system realizes the visible light spectrum detection based on the micro-spectrometer and analyzes the spectrum data by the multi-wavelength spectrophotometry. The results show that the system has the advantages of short measuring time, low power consumption, simple structure and less secondary pollution. At the same time, the relative error of the system was less than 10%, the detection limits of COD and total phosphorus were 2 and 0.008 mg · L -1, the sensitivity was 0.021 3 and 0.452 6, respectively. The standard deviations were 5.6% (15.0 mg · L ~ (-1) COD standard sample) and 5.8% (0.010 mg · L -1 total phosphorus standard sample). There is no significant difference between the actual water sample results and the national standard analysis methods.