The standards for water quality testing compliance involve multiple indicators, each with specific limit requirements. Here are some main water quality indicators and their compliance standards: 1. Physical indicators
Chromaticity: The color of drinking water is usually required to be below 15 degrees (platinum cobalt color). When suspended solids in water are obstructed by strong light, the turbidity of drinking water should not exceed 5 degrees (NTU, scattering).
Turbidity: Turbidity is an indicator of suspended solids content in water, and for drinking water, its turbidity should not exceed 1 NTU.
Visible substances to the naked eye: Water should not contain visible substances to the naked eye, such as impurities, suspended solids, etc. 2. Chemical indicators
PH value: It reflects the acidity and alkalinity of water. For drinking water, its pH value should not be less than 6.5 and not more than 8.5. It is slightly alkaline and suitable for human consumption.
Potassium permanganate index: Calculated as O2, the potassium permanganate index in drinking water should not exceed 3 mg/L. This is a comprehensive indicator for measuring the degree of organic and reducing inorganic pollution in water.
Ammonia nitrogen: The ammonia nitrogen content in drinking water should be very low, generally less than 0.5 mg/L (calculated as N), to ensure the cleanliness and safety of water quality. 3. Microbial indicators
Total bacterial count: an indicator reflecting the degree of biological pollution in water. The total bacterial count in drinking water should not exceed 100 CFU/mL.
Total coliforms and Escherichia coli: As indicator bacteria for fecal contamination, total coliforms and Escherichia coli should not be detected in drinking water. 4. Other indicators
Free chlorine: After 30 minutes of contact with water, the residual free chlorine in the factory water should not be less than 0.3 mg/L and not more than 2 mg/L to ensure the disinfection effect of water quality. Explanation of Compliance Standards
All the above indicators must be within the specified numerical range in order to be considered as meeting water quality standards.
Water quality testing needs to be carried out in accordance with national or local standards, using corresponding testing methods and instruments for measurement.
The test results should be conducted by a professional laboratory and operated and evaluated by trained professionals. precautions
Due to different microbial culture and testing cycles, microbial indicators (such as total bacterial count, total coliform group, etc.) may use non daily sample data.
When conducting water quality testing, it is necessary to ensure the cleanliness of the water collection tools and containers to avoid contaminating the water sample.
If excessive or abnormal water quality is found, measures should be taken in a timely manner for investigation and treatment to ensure the safety of drinking water.
The standards for meeting water quality standards involve multiple aspects and indicators, and require comprehensive and accurate testing and evaluation.