Water quality testing usually requires testing the following items:
1. Dissolved oxygen: used to measure the oxygen content in water, reflecting the redox state and oxygen enrichment degree of the water.
2. pH value: used to measure the acidity and alkalinity of water bodies, reflecting the stability and saturation of water quality.
3. Conductivity: Used to measure the content of ionizing substances in water bodies, reflecting the salinity and pollution level of the water body.
4. Total dissolved solids: used to measure the content of minerals, salts, and other chemical substances in water bodies.
5. Total nitrogen and total phosphorus: used to measure the nutrient content in water bodies and reflect the degree of eutrophication in water quality.
6. Coliform group: used to detect the bacterial content in water and reflect the degree of microbial contamination in water quality.
7. Dissolved Organic Compounds: Used to measure the content of volatile organic compounds in water bodies and reflect the degree of organic pollution in the water.
8. Heavy metals: Used to measure the content of heavy metal elements such as mercury, copper, cadmium, and lead in water, reflecting the degree of heavy metal pollution in the water.
The above are some common water quality testing items, and the actual testing items and methods may vary depending on the needs and occasions.