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BSI BS ISO 20978:2020

Liming material. Determination of neutralizing value. Titrimetric methods
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BSI BS ISO 20978:2020

Liming material. Determination of neutralizing value. Titrimetric methods

PUBLISH DATE 2020
PAGES 24
BSI BS ISO 20978:2020

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 P 2O 5 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 H 2O and CO 2. 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.

SDO BSI: British Standards Institution
Document Number ISO 20978
Publication Date May 18, 2020
Language en - English
Page Count 24
Revision Level
Supercedes
Committee CII/37
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