EQUIPMENT--pH Measurement of Low-Conductivity Waters In Reply Refer To: October 11, 1988 WGS-Mail Stop 412 OFFICE OF WATER QUALITY TECHNICAL MEMORANDUM NO. 89.01 Subject: EQUIPMENT--pH Measurement of Low-Conductivity Waters Office of Water Quality Technical Memorandum 87.03, dated February 12, 1987, contained a draft copy of a paper by Eurybiades Busenberg and L. Niel Plummer on the subject listed above. The paper has been published as Water- Resources Investigations Report (WRIR) 87-4060. Only minor editorial changes were made to the manuscript. A copy of WRIR 87-4060 is being distributed to each District Office as an attachment to this memorandum. Additional copies can be obtained from the Books and Open-File Reports Section, Federal Center, Box 25425, Denver, Colorado (FTS 776-7476). David A. Rickert Attachment This memorandum does not supersede any previous Office of Water Quality memorandums and refers to Office of Water Quality Technical Memorandum 87.03. WRD Distribution: A, B, FO, PO Key Words: water quality, ph measurement, ph electrodes instrumentation