BS ISO 20978:2020
$142.49
Liming material. Determination of neutralizing value. Titrimetric methods
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 24 |
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.
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.
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].
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 6 | Foreword |
| 7 | Introduction |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions 4 Principle |
| 10 | 5 Reagents |
| 11 | 6 Apparatus 7 Sampling 8 Procedure 8.1 Preparation of the test sample 8.2 Determination 8.2.1 Method A |
| 12 | 8.2.2 Method B 9 Calculation and expression of results for method A and method B |
| 13 | 10 Precision 10.1 General |
| 14 | 10.2 Repeatability 10.3 Reproducibility |
| 15 | 11 Test report |
| 16 | Annex A (informative) Results of an interlaboratory trial to determine the neutralizing value |
| 17 | Annex B (informative) Conversion tables |
| 23 | Bibliography |
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ISO 20978:2020
Liming material — Determination of neutralizing value — Titrimetric methods Published By Publication Date Number…
