NEMI Method Summary


Method Summary Information

Method Number:

150.2

Media:

WATER

Revision:

December 1982

Method Source:

U.S. EPA National Exposure Research Laboratory (NERL) [formerly EMSL]

Analytes in this method

Subcategory:

INORGANIC

Official Name:

pH, Continuous Monitoring (Electrometric)

Descriptive Name

pH in Water

Source Info:

U.S.EPA National Exposure Research Laboratory (NERL)
Microbiological and Chemical Exposure Assessment Research Division (MCEARD)
[formerly the Environmental Monitoring Systems Laboratory (EMSL), Cincinnati, OH]
26 West Martin Luther King Drive
Cincinnati, Ohio 45268-0001
Fax: 513-569-7757
email: DWmethods.help@epa.gov

Citation:

Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)

14098

Byte file

Brief Method
Summary:

The pH of a sample is determined electrometrically using a glass electrode with a reference electrode or a single combination electrode.

Scope And
Application:

This method continuously determines pH in drinking, surface, and saline waters; domestic and industrial waste waters.

Applicable
Conc Range:

None Provided

Interferences:

(A) Coating: Inspect electrodes every 30 days to ensure there is not a build-up of oily material or lime on the electrode. Clean electrodes with dilute HCl as required.
(B) Temperature: Temperature effects must be compensated for.
(C) Sodium: error at pH levels greater than 10 can be reduced or eliminated by using a "low sodium error" electrode.

QC Requirements:

None.

Sample Handling:

The composition of the water or waste contacting the measuring electrode system must be representative of the total flow from the water body.

Max Holding Time:

Not Applicable.

Relative Cost:

Less than $50

5760

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Method Summary Information