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WHO 2007年的《pH in Drinking-water》:
CONCLUSIONS
Although pH usually has no direct impact on water consumers, it is one of the most important operational water quality parameters. Careful attention to pH control is necessary at all stages of water treatment to ensure satisfactory water clarification and disinfection. For effective disinfection with chlorine, the pH should preferably be less than 8.0. The pH of the water entering the distribution system must be controlled to minimize the corrosion of water mains and pipes in household water systems. Failure to do so can result in the contamination of drinking-water and in adverse effects on its taste, odour and appearance.
The optimum pH will vary in different supplies according to the composition of the water and the nature of the construction materials used in the distribution system, but is often in the range 6.5–9.5. Extreme pH values can result from accidental spills, treatment breakdowns and insufficiently cured cement mortar pipe linings.
It is not considered to be necessary to propose a health-based guideline value for pH.
世卫没对饮用水做过推荐pH值
国标的6.5~8.5,是考虑了输水管道的腐蚀问题 |
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