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View Actual EPA Method 150.1 (PDF File)
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