OECD Guidelines for the Testing of Chemicals, Section 1
- 2074-5753 (online)
The OECD Guidelines for the Testing of Chemicals is a collection of about 150 of the most relevant internationally agreed testing methods used by government, industry and independent laboratories to identify and characterise potential hazards of chemicals. They are a set of tools for professionals, used primarily in regulatory safety testing and subsequent chemical and chemical product notification, chemical registration and in chemical evaluation. They can also be used for the selection and ranking of candidate chemicals during the development of new chemicals and products and in toxicology research. This group of tests covers physical-chemical properties.
Test No. 122: Determination of pH, Acidity and Alkalinity
- 26 July 2013
- 9789264203686 (PDF)
This Test Guideline describes the procedure for the electronic determination of pH of an undiluted aqueous solution or dispersion, the pH of a dilution of a solution or dispersion in water, or the pH of a chemical diluted to end-use concentration. It also describes procedures to determine acid reserve or alkali reserve for a chemical that is acidic or alkaline with either strong or weak acid or alkali.
The pH of an aqueous solution or dispersion in water is determined with a pH-meter equipped with an appropriate electrode system. The acidity or alkalinity of a solution or dispersion in water is determined by titration with standard acid or alkali using electrometric endpoint detection.