Consumption of dissolved oxygen in water:

COD exceeding the standard means that there is too much organic matter in the water body. This organic matter will consume a large amount of dissolved oxygen during the decomposition process.

The reduction of dissolved oxygen will cause aquatic organisms to be hypoxic, affecting their normal growth and survival, and may even cause a large number of deaths.

Accelerate the deterioration of water quality:

The reduction of dissolved oxygen in the water body will accelerate the corruption and decomposition of organic matter in the water body, and produce more toxic and harmful substances, such as ammonia nitrogen, etc.

This will cause the water quality to drop sharply, and the water body will become turbid, black and smelly.

Affect the water body ecosystem:

Excessive COD content will affect the balance of the water body's ecosystem and reduce the self-purification ability of the water body.

The decomposition of a large amount of organic matter will produce a large number of harmful gases, such as hydrogen sulfide, ammonia, etc., which will poison the organisms in the water body and cause a large number of organisms in the water body to die.

Affect the health of aquatic animals such as fish:

COD exceeding the standard will directly affect the health and reproduction of fish. Toxins produced by the decomposition of organic matter can poison fish and cause their immunity to decline.

At the same time, excessive COD content can also affect the digestive system of fish, causing fish to lose appetite and indigestion, which in turn leads to malnutrition and slow growth.

Excessive COD can also affect the respiratory system of fish, causing them to have difficulty breathing and suffocate due to lack of oxygen.

Threat to human health:

Water with excessive COD contains many harmful substances, such as organochlorine and organophosphorus, which can cause great harm to the human body.

Long-term drinking of such water can easily lead to diseases of the digestive system, nervous system, etc.

These harmful substances may also enter the human body through the enrichment of the food chain, causing chronic poisoning.

Economic losses:

Water pollution can have a great impact on fisheries, agriculture, tourism, etc., leading to economic losses.

For example, fishery output decreases, agricultural product quality decreases, and tourism is affected..

In summary, excessive COD has many harmful effects on water quality, which not only affects the survival and reproduction of aquatic organisms, but also has a serious impact on human health and the economy. Therefore, we should strengthen water quality monitoring and management, take effective measures to reduce COD discharge, and protect the sustainable use of water resources. Boqu Instrument provides professional online cod analyzer which can monitor the COD content in water for you and meet your various needs. The following introduces the common use of online cod meter.

1. Equipment selection and calibration

Select an online cod analyzer that suits the needs of the laboratory, considering factors such as the size of the laboratory, analysis needs, and budget.

Calibrate the online cod analyzer regularly to ensure measurement accuracy. The calibration process should follow the manufacturer's recommendations and use certified calibration standards.

2. Sample processing and preparation

Appropriately treat the water sample, including steps such as removing suspended matter and adjusting pH, to ensure that the water sample meets the measurement requirements of the digestion instrument.

During the sample preparation process, pay attention to avoiding contamination and cross-contamination to ensure the reliability of the measurement results.

3. Control of digestion conditions

The digestion temperature should be controlled between room temperature and 180°C, and the specific temperature should be selected according to the characteristics of the water sample and reagents.

The temperature field uniformity should not be greater than 3°C to ensure that the sample is heated evenly during the digestion process.

Digestion time, amount of digester and other factors also need to be strictly controlled to ensure that the organic matter in the water sample is completely oxidized.

4. Measurement operation and data processing

Strictly follow the operating procedures to avoid errors.

After the measurement is completed, the data should be reasonably processed, including data review, outlier processing and result reporting.

Regularly maintain and service the online cod analyzer to ensure the stability and service life of the equipment.

5. Safety and environmental protection

Strictly abide by laboratory safety regulations to ensure the safety and environmental protection of the operation process.

Wear personal protective equipment such as protective glasses and gloves to avoid direct contact with toxic and hazardous substances.

Properly handle experimental waste liquid and waste to prevent environmental pollution.

6. Training and personnel qualifications

Train relevant personnel to ensure that they have the necessary operating skills and knowledge. The training content includes but is not limited to equipment principles, operating procedures, safety protection and troubleshooting.

Regularly assess and evaluate operators to ensure that they have the corresponding qualifications and capabilities.

In summary, the use of online cod meters needs to meet many conditions, including equipment selection and calibration, sample processing and preparation, control of digestion conditions, measurement operation and data processing, safety and environmental protection, training and personnel qualifications, etc. Only when these conditions are met can the accuracy and reliability of online cod meters be ensured, thus providing strong support for water quality monitoring.