Abstract
Chemical oxygen demand (COD), reflecting the degree of waterbody contaminated by reduction substances, is an important parameter for water quality monitoring. The existing measurement method of waterbody COD takes time and is a complex system, which cannot meet the real-time monitoring requirements of river pollution indicators. We developed the vortex t-structure microfluidic detection chip with the help of microfluidic technology and designed the COD detection system with a high integration degree based on the principle of ozone chemiluminescence, and we have also carried out research on a waterbody COD quantitative detection test. The test results show that the detection chip can generate quantitative and controllable ozone-based bubbles; it also shows the advantages of a simple system and short test time without environmental pollution, which provides some technical support for the online real-time monitoring of river water quality.
Highlights
Chemical oxygen demand (COD) refers to the oxidation dose consumed when water samples are treated with strong oxidants under certain conditions, which is used as an international standard index to evaluate the degree of organic pollution [1,2]
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A vortex T-type microfluidic detection chip was developed by microflu
Summary
The traditional COD analysis method is to use dichromate or potassium permanganate and other strong oxidation reagents to make organic matters in water or wastewater degrade and oxidize, and these reagents have been established and standardized in many countries. This method is not environmentally friendly [3,4], is inconvenient to operate [5], and is difficult to carry out large-scale measurements quickly (in 2–4 h) [6]. For optical detection methods, the cost is high, and it usually requires large and expensive instruments and is difficult to apply to field monitoring
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