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正确认识水的PH值





What is pH in drinking water?

The pH level of your drinking water reflects how acidic it is.pH stands for “potential

hydrogen,” referring to the amount of hydrogen mixed with thewater. pH is measured

on a scale that runs from 0-14. Seven is neutral, indicatingthere is no acid or alkalinity

present. A measurement below 7 indicates acid is present and ameasurement above 7

indicates alkalinity.

The normal range for pH in ground water lies between 6 and 8.5.By comparison, vinegar

measures 3 pH, beer measures between 4 and 5, while milkmeasures around 6.4 pH.

Water with a low pH can be acidic, soft and corrosive. Thiswater can leach metals from

pipes and fixtures, such as copper, iron, lead, manganese andzinc. It can also cause damage

to metal pipes and aesthetic problems, such as a metallic orsour taste, laundry staining or

blue-green stains in sinks and drains.

Water that contains elevated levels of toxic metals could alsoshow a low pH level.

Drinking water with a pH level above 8.5 could indicate that thewater is hard. Hardness

does not pose a health risk, but can cause aesthetic problems,such as an alkali taste to the

water that makes coffee taste bitter; build-up of scale on pipesand fixtures than can lead

to lower water pressure; build-up of deposits on dishes,utensils and laundry basins; difficulty

in getting soap and detergent to foam; and lowered efficiency ofelectric water heaters.

What are the health effects of pH?

The U.S. Environmental Protection Agency (EPA) does not regulatethe pH level in drinking

water. It is classified as a secondary drinking watercontaminant whose impact is considered

aesthetic. However, the EPA recommends that public water systemsmaintain pH levels of

between 6.5 and 8.5, a good guide for individual well owners.

How do I test for pH?

Contact your local health department for a list ofstate-certified laboratories that can test

the pH level of your water. If it is acidic, less than 7 pH, youmay have problems with leaching

of copper and lead from your plumbing. Consider testing for leadif the pH test shows

your water is highly acidic.

wellcare? info on pH in Drinking Water July 2004

wellcare? information for you about

pH in Drinking Water

Well water naturally better… Contact your local water wellprofessional

wellcare? information on pH in Drinking Water Page 2

What is the treatment for pH in drinking water?

Treat the problem of acidic, low pH drinking water with aneutralizer. The neutralizer feeds

a solution, typically using soda ash, into the water to preventthe water from reacting with

the house plumbing or contributing to corrosion, which can leachmetals into the water.

Note: neutralizing with soda ash increases the sodium content ofthe water, which may pose

additional health concerns for your household.

Treat hard water with a high pH with an ion-exchange system orthe addition of a lime-soda

ash mixture. These processes also can increase the sodiumcontent of the water. Contact your

water well professional or your local or state health departmentfor guidance.

For more information about pH and other drinking watercontaminants

U.S. EPA, Secondary Drinking Water Standards:

www.epa.gov/safewater/consumer/2ndstandards.html

NSF International, Well Water:

www.nsf.org/consumer/drinking_water/dw_well.asp?program=WaterTre

Wilkes University, Center for Environmental Quality,GeoEnvironmental Sciences and

Engineering Department, pH of the Water: http://wilkes1.wilkes.edu/~eqc/ph.htm

For more information on your drinking water

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