SIST EN 12945:2014+A1:2016
(Main)Liming materials - Determination of neutralizing value - Titrimetric methods
Liming materials - Determination of neutralizing value - Titrimetric methods
This European Standard 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.
Method B is applicable to all liming materials.
Both methods do not correctly take 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 determine the liming efficiency according to EN 14984.
NOTE The methods described in ISO 6598 [1] and ISO 7497 [2] can be used for the determination of P2O5 content. Further information on P analyses is given in [3] and [4].
Kalkdünger - Bestimmung des Neutralisationswertes - Titrimetrische Verfahren
Amendements minéraux basiques - Détermination de la valeur neutralisante - Méthodes par titrimétrie
Sredstva za apnjenje - Določevanje nevtralizacijske vrednosti - Titrimetrijske metode (vključno z dopolnilom A1)
Ta evropski standard določa dve metodi za določevanje nevtralizacijske vrednosti (NV) sredstev za apnjenje.
Metoda A se uporablja za vsa sredstva za apnjenje razen silikatnih sredstev za apnjenje.
Metoda B se uporablja za vsa sredstva za apnjenje.
Pri obeh metodah se pri sredstvih, ki vsebujejo več kot 3 % P2O5, morebitna nevtralizacijska vrednost ne upošteva pravilno. Za natančnejšo agronomsko oceno proizvodov, ki vsebujejo več kot 3 % P2O5, je treba učinkovitost apnjenja ugotavljati v skladu s standardom EN 14984.
OPOMBA: Metode, opisane v standardih ISO 6598 [1] in ISO 7497 [2], se lahko uporabljajo za določevanje deleža P2O5. Dodatne informacije o analizah P so podane v sklicih [3] in [4].
General Information
- Status
- Published
- Publication Date
- 09-Nov-2016
- Technical Committee
- KAT - Soil quality
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 07-Nov-2016
- Due Date
- 12-Jan-2017
- Completion Date
- 10-Nov-2016
Relations
- Replaces
SIST EN 12945:2014 - Liming materials - Determination of neutralizing value - Titrimetric methods - Effective Date
- 01-Dec-2016
- Consolidates
SIST EN 12945:2014 - Liming materials - Determination of neutralizing value - Titrimetric methods - Effective Date
- 18-Jan-2023
- Consolidates
SIST EN 12945:2014/kprA1:2016 - Liming materials - Determination of neutralizing value - Titrimetric methods - Effective Date
- 01-Dec-2016
Overview
EN 12945:2014+A1:2016 (CEN) specifies titrimetric methods for the determination of the neutralizing value (NV) of liming materials. The standard describes two validated procedures:
- Method A - applicable to all liming materials except silicate liming materials (titration to pH 7.0).
- Method B - applicable to all liming materials (end-point taken at the titration turning point pH 4.8).
Both methods are based on acid dissolution of the sample and back titration to quantify excess acid. The standard also notes a limitation: materials containing more than 3 % P2O5 are not fully accounted for in potential neutralizing value and should be assessed for agronomic performance using EN 14984.
Key topics and technical requirements
- Principle: Dissolve the liming material in a standardized hydrochloric acid solution and determine excess acid by back titration with standardized sodium hydroxide.
- Reagents & solutions:
- HCl standard solution c = 0.50 mol/L (exact concentration determined by titration).
- NaOH standard solution c = 0.25 mol/L (standardized against potassium hydrogen phthalate).
- Phenolphthalein indicator, diluted H2O2 (where applicable), and grade 3 water (EN ISO 3696).
- End-points:
- Method A: titration to pH 7.0 (not suitable for silicate materials).
- Method B: end-point at pH 4.8 (suitable for silicates).
- Apparatus & sample prep:
- pH meter (sensitivity 0.05 pH units), magnetic stirrer, desiccator, 250 µm test sieve (ISO 3310-1).
- Drying to constant mass at (105 ± 2) °C and sieving to 250 µm prior to analysis (sample prep per EN 1482-2).
- Results expression & corrections:
- NV may be expressed as CaO-equivalents or HO– equivalents; conversion tables and correction factors are provided.
- Laboratories must determine exact reagent concentrations and apply correction factors; precision data and inter-laboratory trial results are included.
Applications and users
EN 12945 is intended for:
- Fertilizer and liming material manufacturers for product specification and quality control.
- Analytical and agronomic laboratories performing compositional testing and NV certification.
- Regulatory authorities and inspection bodies enforcing labeling and compliance.
- Soil scientists and agronomists assessing liming products for soil pH management.
Keywords: EN 12945, neutralizing value, liming materials, titrimetric methods, titration, back titration, pH 4.8, pH 7.0, P2O5, EN 14984, CEN.
Related standards
- EN 1482-2 (sample preparation)
- EN 12944-3 (vocabulary for liming materials)
- EN ISO 3696 (laboratory water)
- ISO 3310-1 (test sieves)
- ISO 6598 and ISO 7497 (P2O5 determination)
- EN 14984 (liming efficiency for high P2O5 products)
Frequently Asked Questions
SIST EN 12945:2014+A1:2016 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Liming materials - Determination of neutralizing value - Titrimetric methods". This standard covers: This European Standard 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. Method B is applicable to all liming materials. Both methods do not correctly take 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 determine the liming efficiency according to EN 14984. NOTE The methods described in ISO 6598 [1] and ISO 7497 [2] can be used for the determination of P2O5 content. Further information on P analyses is given in [3] and [4].
This European Standard 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. Method B is applicable to all liming materials. Both methods do not correctly take 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 determine the liming efficiency according to EN 14984. NOTE The methods described in ISO 6598 [1] and ISO 7497 [2] can be used for the determination of P2O5 content. Further information on P analyses is given in [3] and [4].
SIST EN 12945:2014+A1:2016 is classified under the following ICS (International Classification for Standards) categories: 65.080 - Fertilizers. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 12945:2014+A1:2016 has the following relationships with other standards: It is inter standard links to SIST EN 12945:2014, SIST EN 12945:2014, SIST EN 12945:2014/kprA1:2016. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 12945:2014+A1:2016 is associated with the following European legislation: EU Directives/Regulations: 2003/2003, 2019/1009. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase SIST EN 12945:2014+A1:2016 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.LWULPHWULMVNHKalkdünger - Bestimmung des Neutralisationswertes - Titrimetrische VerfahrenAmendements minéraux basiques - Détermination de la valeur neutralisante - Méthodes par titrimétrieLiming materials - Determination of neutralizing value - Titrimetric methods65.080GnojilaFertilizersICS:Ta slovenski standard je istoveten z:EN 12945:2014+A1:2016SIST EN 12945:2014+A1:2016en,fr,de01-december-2016SIST EN 12945:2014+A1:2016SLOVENSKI
STANDARDSIST EN 12945:20141DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12945:2014+A1
October
t r s x ICS
x wä r z r Supersedes EN
s t { v wã t r s vEnglish Version
Liming materials æ Determination of neutralizing value æ Titrimetric methods Amendements minéraux basiques æ Détermination de la valeur neutralisante æ Méthode par trimétrie
Kalkdünger æ Bestimmung des Neutralisationswertes æ Titrimetrische Verfahren This European Standard was approved by CEN on
z February
t r s v and includes Amendment
s approved by CEN on
s s June
t r s xä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey andUnited Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s t { v wã t r s v ªA sã t r s x ESIST EN 12945:2014+A1:2016
Results of an inter-laboratory trial to determine the neutralizing value . 10 Annex B (informative)
!Conversion tables" . 11 Bibliography . 14
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