COD water quality on-line automatic analyser using fluorescence method to measure -
When blue light is applied to a fluorescent material, it induces the material to emit red light. However, the presence of oxygen molecules absorbs some of the excitation energy through a mechanism known as bursting, which results in the duration and brightness of the red light being inversely related to the oxygen concentration. The oxygen concentration can be accurately calculated by measuring the phase difference between the red light and a reference light source and comparing it to a pre-set calibration value for the device. Further by linearisation and temperature correction, an accurate oxygen concentration reading can be derived.
Compared to analytical testing in the laboratory, COD water quality on-line automated analysers provide a continuous and consistent stream of water quality data, allowing immediate water quality conditions in the aquatic environment to be quickly grasped. However, for detailed quantitative analysis of a particular problem, laboratory testing is still an indispensable means of verification.
Online monitoring equipment consumes less reagent per test, which helps to reduce the overall cost of reagents. As online monitoring devices require some space for installation, they are more suitable for deployment at critical monitoring points, such as industrial outfalls, outlets of wastewater treatment plants, and other areas with high concentration of pollutants, so as to be able to quickly respond to and deal with pollution incidents. Laboratory testing, on the other hand, although widely applicable, has poorer timeliness of results and is not sensitive enough for rapid identification of pollution sources and monitoring at specific times of the day.
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