Liming material Determination of neutralizing value Titrimetric methods

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English, French

Published date

05-15-2020

Publisher

International Organization for Standardization

This document specifies two methods for the determination of the neutralizing value (NV) of liming materials.

Method A is applicable to all liming materials except silicate liming materials.

NOTE 1 Examples of hard liming materials are limestone and dolomite. Examples of soft liming materials are chalk, marl and burnt lime.

Method B is applicable to all liming materials.

Neither method correctly takes into account the potential neutralizing value of material containing more than 3 % P₂O₅. For a more accurate agronomic assessment of products containing more than 3 % P₂O₅, EN 14984^[8]is used to determine the liming efficiency.

NOTE 2 The methods described in ISO 6598 and ISO 7497 can be used for the determination of P₂O₅ content. Further information on P analyses is given in References [5] and [6].

NOTE 3 Carbonate consumes H⁺ and removes acidity in solution with subsequent dissociation to H₂O and CO₂. Forms of orthophosphate can consume H⁺ but are not dissociated to molecular forms that remove acidity. The acidity is back titrated with alkali causing an underestimation of NV.

DocumentType	Standard
Pages	15
ProductNote	THIS STANDARD ALSO REFERS TO EN 1482-3,EN 14984,
PublisherName	International Organization for Standardization
Status	Current