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Study on an Online Detection Method for Ground Water Quality and Instrument Design
Xiushan Wu1, Renyuan Tong2, Yanjie Wang3
1School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China. wuxiushan@cjlu.edu.cn.
This study introduces a UV spectrophotometry method for real-time groundwater quality monitoring. The developed instrument accurately measures chemical oxygen demand (COD), total organic carbon (TOC), nitrate nitrogen, and turbidity, ensuring timely pollution alerts.
Area of Science:
- Environmental Science
- Analytical Chemistry
- Water Resource Management
Background:
- Online groundwater quality monitoring is crucial for water resource protection.
- Timely detection of pollution events requires real-time water quality data.
- Existing methods may lack the precision or real-time capabilities needed for effective groundwater management.
Purpose of the Study:
- To develop and validate a remote online measurement method for key groundwater quality parameters.
- To improve the accuracy of chemical oxygen demand (COD) measurements through turbidity compensation.
- To create a functional instrument for simultaneous online monitoring of multiple groundwater contaminants.
Main Methods:
- Utilized ultraviolet (UV) spectrophotometry as the core measurement principle.
- Developed correlated mathematical models for chemical oxygen demand (COD) and total organic carbon (TOC).
- Implemented turbidity-compensated mathematical modeling to enhance COD measurement accuracy.
- Designed and tested a measurement instrument adhering to China's water quality monitoring standards.
Main Results:
- The developed instrument accurately measures groundwater COD, TOC, nitrate nitrogen (NO3-N), and turbidity (TURB).
- Absolute measurement errors for COD, TOC, and NO3-N were below 5.0%.
- Turbidity (TURB) measurement error was less than 5.4%, even with turbidity ranging from 0 to 100 NTU.
Conclusions:
- The proposed UV spectrophotometry method and developed instrument meet the requirements for online groundwater quality monitoring.
- This technology provides a reliable solution for real-time assessment and protection of groundwater resources.
- The system offers timely pollution warnings, contributing to effective water resource management.
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