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Beijing Times New Wei Measurement and Control Equipment Co., Ltd
Instructions for the determination method and standard operating procedures of dissolved oxygen in sewage
Date: 2025-07-07Read: 2
Dissolved oxygen is an important indicator for measuring water quality, which directly affects the self purification capacity of water bodies and the ecological environment. Accurately measure the concentration of pollutants in wastewaterDissolved oxygen in sewageThe content is of great significance for evaluating the effectiveness of sewage treatment and protecting water resources. This article introduces commonly used measurement methods and standard operating procedures.
1. Common measurement methods
At present, laboratory and on-site testing mainly use two methods: iodometric method and electrochemical probe method. The iodometric method is a classic chemical analysis method that determines through chemical reactionsDissolved oxygen in sewageThe content and results are accurate, but the operation is complex. The electrochemical probe method uses sensors for direct measurement, which is easy and fast to operate, suitable for rapid on-site detection, and is currently widely used.
2. Standard Operating Procedure
Regardless of the method used, standardized operational procedures are the key to ensuring accurate results. Firstly, clean the sampling container to avoid residue interference with the detection. When sampling, be careful to avoid water disturbance and prevent oxygen from the air from dissolving into the sample. After sample collection, it should be immediately fixed or measured to avoid changes in dissolved oxygen content over time.
When using the iodometric method, it is necessary to strictly control the reaction conditions, including the order of reagent addition, reaction time, and temperature. The electrochemical probe method requires regular calibration of sensors to ensure measurement accuracy. Both methods require parallel measurements to verify the reliability of the results through repeated experiments.
3. Key points of quality control
To ensure the quality of the measurement, the following key points should be noted: avoid contamination during the sampling process and use clean containers; Reagent preparation and storage meet the requirements to prevent failure; Regular maintenance and calibration of instruments and equipment; Operators need to undergo training and master standardized operating methods.
4. Result recording and reporting
The test results should be accurately recorded, including information such as measurement time, location, method, and operator. The expression of results should comply with relevant standard requirements, and if necessary, indicate the measurement conditions and precautions. Abnormal results should be analyzed for their causes and retested for verification if necessary.
Dissolved oxygen in sewageMeasurement is the fundamental work of water quality monitoring, and standardized operation and strict quality control are prerequisites for obtaining accurate results. Mastering the correct measurement methods and operating points plays an important role in evaluating the effectiveness of sewage treatment and protecting the water environment.