NEMI Method Summary


Method Summary Information

Method Number:

150.1

Media:

WATER

Revision:

Issued 1971; Editorial Revision 1978 and 1982

Method Source:

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

Analytes in this method

Subcategory:

INORGANIC

Official Name:

pH, Electrometric Method

Descriptive Name

pH in Water by Electrometric Method

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)

16262

Byte file

Brief Method
Summary:

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

Scope And
Application:

This method determines the pH of drinking, surface and saline water; and domestic and industrial wastes and acid rain (atmospheric deposition).

Applicable
Conc Range:

None given.

Interferences:

(1) Sodium error may bias results at pH > 10 unless a "low sodium error" electrode is used. (2) Coatings of oily material can impair electrode. (3) Temperature effects.

QC Requirements:

not included

Sample Handling:

Collect a volume of 25 mL in glass or plastic bottles. No preservation is required. The samples should be analyzed as soon as possible after collection, preferably in the field.

Max Holding Time:

ASAP

Relative Cost:

Less than $50

4685

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Method Summary Information