How many items are routinely tested for drinking water？

Writer： admin Time：2024-01-10 16:45:21 Browse：452℃

Drinking water testing equipment is mainly used to test the water quality of drinking water testing equipment, water testing equipment can be based on the detection of different types of water quality parameters to be divided, including microbiological indicators, toxicological indicators, sensory properties and general chemical indicators, radioactive indicators, disinfectant indicators and requirements.

According to the national standard "GB 5749-2022 drinking water health standards" in the relevant requirements of the provisions can be seen, for drinking water parameter indicators a total of 97, of which 39 water quality routine indicators, disinfectant routine indicators of 4, 54 water quality extension indicators. Want to carry out all the tests, some are not very realistic, and some parameters must be with the help of professional water quality testing equipment.

Therefore, we only need to choose this common drinking water parameters: residual chlorine, total dissolved solids, pesticide residues and PH concentration of some of them can be.

(1) Residual chlorine (residual chlorine limit in GB5749-2006, "Health Standard for Drinking Water": contact time with water ≥ 30min, limit of 4mg/L in the factory water; residual in the factory water ≥ 0.3mg/L; residual in the water at the end of the pipe network ≥ 0.05mg/L;).

(2) water sensory indicators, such as chromaticity, turbidity, visible to the naked eye, smell and taste ("Drinking Water Health Standards" GB5749-2006 in the turbidity limit: 1NTU).

(3) Electrical conductivity (total dissolved solids, abbreviated as T.D.S)
Water conductivity that is the reciprocal of the resistance of water, usually used to indicate the purity of water. The national standard GB5749-2006 "drinking water health standards" in the drinking water of the total dissolved solids (TDS) has a limited requirement: total dissolved solids ≤ 1000 mg / L Obviously, the gap with the international standard is too large. With the development of industry, the variety and number of pollutants in the water increased, the value may have long been inconsistent with human drinking standards. When the TDS value of more than 200, for industrial water standards, more than 300 is contaminated by industrial water. What is the TDS value of various kinds of water? The TDS value of tap water is different in different areas, and it is higher in the north. General tap water TDS value of water in the 180-260 or so, if it is a deep well groundwater to be on the high side, in the 300 or so, some places are in the industrial area, the groundwater body is contaminated with higher are possible. General reverse osmosis (RO) technology normal treatment of water within 50, in line with human consumption.

(4) pH: "Drinking Water Hygiene Standards" stipulates that the pH value of tap water between 6.5 ~ 8.5, acidic or alkaline water is too strong for the human body is not good, so the pH value of the test is also very important.