ISO 20978

Liming material — Determination of neutralizing value — Titrimetric methods

Applicability: ISO 20978 applies to determining the neutralizing value (NV) of liming materials using titration, with Method A covering most types except silicates, and Method B for all, including silicates. It is used for chalk, marl, limestone, and dolomite, but not materials with >3% P205.

Purpose: ISO 20978 specifies laboratory titrimetric methods to determine the neutralizing value (NV) of liming materials (limestone, dolomite, chalk, burnt lime, and industrial slags). It assesses a product’s capacity to neutralize soil acidity, allowing expression as CaO, CaCO3, or HO equivalents.