ISO-20978 Liming material - Determination of neutralizing value - Titrimetric methods

ISO-20978 - 1ST EDITION - CURRENT


Document Center Inc. is an authorized dealer of ISO standards.
The following bibliographic material is provided to assist you with your purchasing decision:


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.

ORDER

Price:

$120.28        


Want this as a site license?

To find similar documents by classification:

65.080 (Fertilizers Including soil conditioners and culture medium)

This document comes with our free Notification Service, good for the life of the document.

This document is available in either Paper or PDF format.

Document Number

ISO 20978:2020

Revision Level

1ST EDITION

Status

Current

Publication Date

May 1, 2020

Committee Number

ISO/TC 134