Water quality testing is an important means to ensure the safety of drinking water and environmental quality, and the interpretation of its results is of great significance for safeguarding public health and environmental protection. The results of water quality testing usually include multiple indicators, each with its specific meaning and interpretation method. Below, we will introduce some common water quality testing indicators and their meanings.

1. pH value

pH value is an important indicator for measuring the acidity and alkalinity of water quality. Normally, the pH value of drinking water should be between 6.5 and 8.5. Low pH value may indicate an excessive amount of acidic substances in the water, while a high pH value may indicate an excessive amount of alkaline substances. Abnormal changes in pH value may affect the growth of microorganisms in water, corrode equipment, and affect human health.

2. Dissolved oxygen (DO)

Dissolved oxygen is the oxygen content in water bodies that can support life activities. The dissolved oxygen in water bodies mainly comes from oxygen in the atmosphere dissolving into water through the gas-water interface. Low dissolved oxygen levels may indicate that the water body is polluted, affecting the survival of aquatic organisms. Normally, the concentration of dissolved oxygen should be kept above 5 milligrams per liter.

3. Heavy metals

Heavy metals refer to metal elements with high toxicity, difficult to decompose, and difficult to be biodegraded in the environment. Common ones include lead, mercury, cadmium, chromium, and so on. These heavy metals can enter water bodies through industrial emissions, domestic waste, agricultural pollution, and other ways. Long-term intake of water containing high concentrations of heavy metals can lead to health problems such as organ damage and nervous system damage.

4. Ammonia nitrogen (NH3-N)

Ammonia nitrogen is a nitrogen compound in water bodies and is one of the important indicators for measuring the degree of water pollution. High ammonia nitrogen content may indicate that the water body is contaminated by organic matter. In addition, ammonia nitrogen may promote the growth of blue algae in water bodies, thus producing harmful algae.

5. Total phosphorus (TP)

Total phosphorus is the sum of soluble and insoluble phosphorus in water bodies. High total phosphorus content may indicate that the water body is contaminated by agricultural runoff, urban wastewater, and so on. Excessive total phosphorus promotes eutrophication of water bodies, leading to excessive algal growth, affecting the health of aquatic ecosystems.

6. Total nitrogen (TN)

Total nitrogen is the sum of soluble and insoluble nitrogen in water bodies. High total nitrogen content may indicate that the water body is contaminated by organic matter. Excessive total nitrogen levels not only affect the health of aquatic ecosystems but may also pose potential threats to human health.

7. Organic matter index

includes total organic carbon (TOC), chemical oxygen demand (COD), and so on. High organic matter content may indicate that the water body is contaminated by organic matter. These organic matter may accumulate through the food chain, posing potential threats to human health.

Interpreting water quality test results

When interpreting water quality test results, it is necessary to conduct comprehensive analysis based on local water quality standards and historical data. For example, if an index exceeds the standard, further investigation into its source should be conducted, and corresponding measures should be taken for treatment. At the same time, regular monitoring of water quality trends should be carried out to take timely preventive and control measures to ensure water quality safety.

In summary, the correct interpretation of water quality test results is crucial for ensuring drinking water safety and ecological environmental protection. The public and relevant departments should pay attention to water quality monitoring and jointly maintain a good water environment.