Description

Part 4500-H⁺ pH Value 

Measurement of pH is one of the most important and frequently used tests in water chemistry. Following an introductory discussion (A), one method is given for the measurement of pH. This electrometric method (B) is described in detail. A general discussion of the principle on which the method is based, and interferences encountered, is followed by a description of apparatus and procedure, including sections on troubleshooting and precision and bias. A table gives the weight of chemicals needed per 1000 mL aqueous solution at 25^oC to prepare various pH standard solutions. A second table gives standard pH values at various temperatures, including primary and secondary standards.

Scope

Analysts, researchers, and regulators have relied on this peer-reviewed publication since 1905. The trusted source of accurate, proven methodology for analyzing natural waters, water supplies, and wastewaters.

The 23rd edition of Standard Methods for the Examination of Water and Wastewater® contains over 400 laboratory methods for the analysis of:

• Dissolved Solids
• Metals
• Free and Total Chlorine
• Odor, Taste, and Flavor Profile Analysis
• Disinfection By-products
• Radionuclides
• Total Organic Carbon
• Total and Fecal Coliform

Laboratories worldwide rely on this comprehensive reference as the trusted source of accurate, proven methodology for analysis of water, water supplies, and wastewater. It is the essential resource for water analysis professionals.

The methods in the 23rd edition (as in previous editions) are believed to be the best available, generally accepted procedures for analyzing water, wastewater, and related materials. They represent the recommendations of specialists, ratified by a large number of analysts and others of more general expertise, and as such are truly consensus standards, offering a valid and recognized basis for control and evaluation. All methods are dated to identify which ones changed significantly between editions.

New in the 23rd edition

• Over 80 revised methods and 5 new methods added
• Extensive revisions to Microbiological Examination (Part 9000)
• New drinking water method to test for pharmaceuticals and personal care products
• New, more realistic, visuals to help identify aquatic organisms
• Revisions to Solids, Cyanide, Nitrate, Dissolved Oxygen, and Biochemical Oxygen Demand