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BS ISO 20978:2020

BS ISO 20978:2020

Current

Current

The latest, up-to-date edition.

Liming material. Determination of neutralizing value. Titrimetric methods

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

05-18-2020

Publisher

British Standards Institution

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

This document specifies two methods for the determination of the neutralizing value (NV) of liming materials.MethodA is applicable to all liming materials except silicate liming materials. NOTE1 Examples of hard liming materials are limestone and dolomite. Examples of soft liming materials are chalk, marl and burnt lime.MethodB 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, EN14984[ 8] is used to determine the liming efficiency. NOTE2 The methods described in ISO6598 and ISO7497 can be used for the determination of P 2O 5 content. Further information on P analyses is given in References[ 5] and [ 6]. NOTE3 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.

Committee
CII/37
DocumentType
Standard
ISBN
9780580927409
Pages
24
PublisherName
British Standards Institution
Status
Current

Standards Relationship
ISO 20978:2020 Identical

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Hardcopy - English
PDF - English
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