pH measurement of low-conductivity waters

Water-Resources Investigations Report 87-4060
By:  and 



pH is an important and commonly measured parameter of precipitation and other natural waters. The various sources of errors in pH measurement were analyzed and procedures for improving the accuracy and precision of pH measurements in natural waters with conductivities of < 100 uS/cm at 25 C are suggested. Detailed procedures are given for the preparation of dilute sulfuric acid standards to evaluate the performance of pH electrodes in low conductivity waters. A daily check of the pH of dilute sulfuric acid standards and deionized water saturated with a gas mixture of low carbon dioxide at partial pressure (air) prior to the measurement of the pH of low conductivity waters is suggested. (Author 's abstract)

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title pH measurement of low-conductivity waters
Series title Water-Resources Investigations Report
Series number 87-4060
DOI 10.3133/wri874060
Edition -
Year Published 1987
Language ENGLISH
Publisher U.S. Geological Survey ; Books and Open-File Reports [distributor],
Description iv, 22 p. :ill. ;28 cm.