EPA Method 150.1

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EPA Method 150.1:
pH in Water by Electrometric Method. Official Name: pH, Electrometric 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:
This method determines the pH of drinking, surface and saline water; and domestic and industrial wastes and acid rain (atmospheric deposition).

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

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

Maximum Holding Time:
ASAP

Media:
WATER

Subcategory:
Inorganic

Concentration:
None given.

Precision:
Precision and accuracy values were calculated using interlaboratory data from EPA-managed Water Pollution (WP) performance evaluation studies.

Detection:
-

Revision Number:
Issued 1971; Editorial Revision 1978 and 1982

Test Description:
pH - Electrometric 6

Instrument used for this test:
pH