National Environmental Methods Index

Method Summary

Method Source U.S. EPA National Exposure Research Laboratory (NERL) [formerly EMSL] Method Number 150.1 Revision Information Issued 1971; Editorial Revision 1978 and 1982 Method Name Descriptive Name: pH in Water by Electrometric Method Official Name: pH, Electrometric Method Media Media: WATER Subcategory Inorganic Citation Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020) Method Download Download full method now (PDF file) Summary of Method 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 Concentration 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/Effort Less than $50 Sample Prep Method(s)

Method pH in Water by Electrometric Method has 1 analytes associated with it.