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Citation: ZHU Xiao-Ting, ZHU Zhe-Xin, YE Mei-Ying. Photocatalytic Degradation of Organic Phosphorus in Microreactor and On-line Detection of Total Phosphorus[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(1): 106-111. doi: 10.19756/j.issn.0253-3820.171499 shu

Photocatalytic Degradation of Organic Phosphorus in Microreactor and On-line Detection of Total Phosphorus

College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, China

Received Date: 11 December 2017
Revised Date: 14 October 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (No.21407039).

A photocatalytic microreactor coated with nano-TiO₂ powder was prepared in this work. By using UV-LED as light source and UV-vis spectrometer as detector, a microfluidic analysis system was established. Organic phosphorus (Chlorpyrifos) in water sample was on-line detected by the microfluidic analysis system with the spectrophotometric detection of the intensely coloured phospho-molybdenum blue. Influence factors such as light intensity, flow rate and pH value of organic phosphorus sample, flow rate of ammonium molybdate with ascorbic acid were investigated and optimized. Standard phosphate solutions were measured under optimized conditions and showed a good linear relationship in the range of 0.05-5.0 mg/L. Detection limit of standard phosphate was 0.013 mg/L (3σ), which was almost the same as that of the national standard method. In this study, organic phosphorus samples with total phosphorus of 0.10-0.50 mg/L were photodegradated on-line and total phosphorus was also detected on-line. The RSDs were less than 4.0% (n=5). Chlorpyrifos of 0.05-0.50 mg/L could be photodegradated in 30 s and the errors of measurement were less than ±5%. It took only 15 min to complete the whole process of measurement including degradation of organic phosphorus sample. The microfluidic analysis system for detection of organic phosphorus has the advantage of less pollution, less time consuming and easy operation. It has good application potential in on site environmental monitoring.
- Microreactor,
- Organic phosphorus,
- Photocatalytic degradation,
- Total phosphorus,
- On-line detection
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