摘要水体中总磷的含量过高会造成水体富营养化，使水质变坏，所以有效的检测和控制环境水体中总磷的含量就显得非常有意义。本文以内壁涂覆TiO2的微控流芯片为反应容器，加以紫外光照射，实现有机磷的高效光催化降解，并结合钼酸铵分光光度法来测定降解产物的吸光度。以毒死蜱为样品，考察氧化剂、温度、流速、样品初始pH等因素对毒死蜱降解率的影响并测定了磷酸盐标准曲线的线性范围，以此建立起集样品在线光催化降解、磷酸根离子的吸光度在线检测于一体的微分析系统。实验测定，在流速为样品在流速为样品-400μL/h，钼酸盐、抗坏血酸-150μL/h，不添加氧化剂和毒死蜱样品初始pH值为9，温度为30℃的情况下，光降解率最高达到92.04%；在此最佳条件下，磷酸盐标准曲线的线性范围为1-50mg/L，相关系数为0.9917。完成一次总磷测定的时间不超过500s。62397

Abstract Excessive amounts of total phosphorus in the water can cause eutrophication of water, deteriorate the water quality. So it’s very important to detect and control the content of total phosphorus in environmental water. In this article we use the microfluidic chip coated with TiO2 thin film in it’s inner wall as the reactor vessel, in which photocatalytic degradation of organophosphorus in water samples is performed effectively, and combined with the ammonium molybdate spectrophotometric method to determine the absorbance of the degradation products . Using chlorpyrifos as the organophosphorus sample, the effects of factors such as oxidant, temperature, flow rate, the initial pH of samples on the degradation rate of chlorpyrifos are investigated. The linear range of phosphate standard curve for chlorpyrifos are also determined. Finally, the micro analysis system integrated with sample photocatalytic degradation and online detection of phosphate ion is established. According to the experimental, under the conditions of flow rate of sample being 400 u L/h; flow rate of molybdate, ascorbic acid being 150 u L/h,with no oxidant; and the chlorpyrifos sample being pH 9; temperature is 30 degrees Celsius, the highest photodegradation rate of chlorpyrifos reached to 92.04%; and the linear range of phosphate standard solution is 1-50 mg/L, the correlation coefficient is 0.9917. The total time of one analysis procedure for determination of total phosphorus was no more than 500s.

毕业论文关键词：有机磷降解；光催化氧化；总磷；在线检测

keyword： The degradation of organic phosphorus；Photocatalytic oxidation；Total phosphorus；Online detecting

1 引言 6

2 实验内容 7

2.1仪器与试剂 7

2.2总磷的微量测定方法建立总磷测定的标准曲线 8

2.2.1总磷含量 8

2.2.2总磷的在线检测 9

3 实验结果 10

3.1毒死蜱的光降解条件考察 10

3.1.1 氧化剂的选择 10

3.1.2反应物流速的选择 11

3.1.3反应温度的选择 11

3.1.4样品初始pH的选择 12

3.1.5 毒死蜱初始浓度的影响 13

3.2磷酸盐标样的在线检测 13

3.3 毒死蜱样品含量测定及加标回收率 14

4 结论 15

参考文献 16

1 引言