BS 3762-3.25:1989

This standard BS 3762-3.25:1989 Analysis of formulated detergents is classified in these ICS categories:

• 71.100.40 Surface active agents

This Section of BS 3762 describes methods for determining the content of water or volatile matter in formulated detergents.

NOTE 1 The water determined may include water of crystallization.

Method 1 is for determination of water in samples that do not contain volatile compounds that are miscible with water, for example, low molecular mass alcohols. Method 2 is for determination of the loss in mass on heating at 150 °C, which indicates the volatile matter content; the result will be the water content if water is the only volatile compound in the sample. Method 3 is for determination of water in liquids and in pastes and solids that release all their water during the titration of a solution or a dispersion in methanol; it is not applicable to samples that contain noticeable amounts of oxidizing agents, ketones, strong acids or strong bases.

NOTE 2 The titles of the publications referred to in this Section are listed on the inside back cover.

Entrainment method using azeotropic distillation with xylene, oven drying method (loss in mass on heating at 150°C) and Karl Fischer method.