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
- 25-Oct-2016
- Technical Committee
- CEN/TC 260 - Fertilizers and liming materials
- Drafting Committee
- CEN/TC 260/WG 3 - Liming materials
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 22-Nov-2025
- Completion Date
- 03-Dec-2025
Relations
- Merged From
EN 12945:2014/FprA1 - Liming materials - Determination of neutralizing value - Titrimetric methods - Effective Date
- 18-Jan-2023
- Merged From
EN 12945:2014 - Liming materials - Determination of neutralizing value - Titrimetric methods - Effective Date
- 18-Jan-2023
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
EN 12945:2014+A1:2016 is a standard published by the European Committee for Standardization (CEN). 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].
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.
EN 12945:2014+A1:2016 has the following relationships with other standards: It is inter standard links to EN 12945:2014/FprA1, EN 12945:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
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 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 CEN 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
...
The standard EN 12945:2014+A1:2016 provides a comprehensive framework for the determination of the neutralizing value (NV) of liming materials through two specified titrimetric methods. The scope of this European Standard is well-defined, making it a crucial reference for professionals in the agricultural and environmental sectors. One of the strengths of this standard is its dual-method approach. Method A is designed for the majority of liming materials, excluding silicate liming materials, allowing for a broad application in various agricultural practices. Method B further ensures that all liming materials can be assessed, enhancing the standard's versatility and relevance in different contexts. This inclusiveness is particularly advantageous for stakeholders seeking standardized methods to evaluate liming materials effectively. The standard also acknowledges limitations in its applicability, specifically regarding materials with a P2O5 content exceeding 3%. It provides guidance on how to approach the assessment of such materials by referencing EN 14984, which is essential for agronomists and agricultural producers aiming for precise nutrient management strategies. This level of detail reflects a high standard of rigor in ensuring that stakeholders are aware of potential limitations and necessary adjustments in their assessments. Moreover, the inclusion of additional resources for the determination of P2O5 content, via references to ISO 6598 and ISO 7497, further strengthens the document's utility. This cross-referencing evidences the standard's commitment to comprehensive analysis methods while providing a broader context for evaluating liming materials. In summary, EN 12945:2014+A1:2016 is a robust standard encompassing critical methodologies for assessing the neutralizing value of liming materials. Its dual-method approach, clear guidelines on limitations, and references to complementary documents underscore its significance and relevance within agricultural practices and environmental management.
표준 EN 12945:2014+A1:2016은 석회 재료의 중화 가치(NV)를 결정하는 두 가지 정량적 방법을 규정하고 있습니다. 이 표준은 고품질 석회 재료의 사용을 위한 필수 기준을 제공하며, 특히 농업에서 토양 개량제로 사용되는 석회 재료의 효과를 평가하는 데 중요한 역할을 합니다. Method A는 규산 석회 재료를 제외한 모든 석회 재료에 적용 가능하며, Method B는 모든 석회 재료에 적용 가능한 장점을 지니고 있습니다. 두 방법 모두 석회 재료의 중화 가치를 정확하게 측정할 수 있도록 설계되어 있습니다. 그러나 3% 이상의 P2O5를 포함한 재료의 중화 가치는 올바르게 반영되지 않으므로, 이러한 경우에는 EN 14984에 따라 석회 효율성을 결정하는 것이 필요합니다. 이 표준의 강점은 다양한 석회 재료에 대한 적용성을 높이고, 농업적 효율성을 촉진하는 데 기여할 수 있다는 점입니다. 또한, ISO 6598 및 ISO 7497을 사용하여 P2O5 함량을 결정할 수 있는 부가적인 방법을 제공하므로, 사용자는 이 표준에 기초하여 더욱 정확한 분석을 수행할 수 있습니다. 결론적으로 EN 12945:2014+A1:2016은 석회 재료의 중화 가치를 판단하는 데 필수적인 도구로, 농업에서의 적용 가능성과 효과성을 높이는 데 중요한 기준으로 자리 잡고 있습니다.
SIST EN 12945:2014+A1:2016は、石灰材料の中和価値（NV）を決定するための方法を規定した欧州標準です。この標準は、石灰材料に関連する業界において非常に重要な役割を果たしており、特に農業分野における土壌改良剤の適切な使用を促進することを目的としています。 この標準の強みは、2つの異なる測定方法を提供している点です。方法Aは、シリケート石灰材料を除くすべての石灰材料に適用可能であり、方法Bはすべての石灰材料に対応しています。この柔軟性により、異なる種類の石灰材料に対して適切な測定が実施できるという利点があります。 また、EN 12945:2014+A1:2016は、3％以上のP2O5を含む材料の中和価値を正しく評価できないことに注意を喚起しています。この点は、農業における実際の使用において重要な考慮事項であり、より正確な農業評価を行うためには、EN 14984に従って石灰効率を決定する必要があります。この標準は、農業向けの石灰材料の評価を行う上での基盤を提供し、適切な施肥計画の策定に寄与します。 さらに、ISO 6598およびISO 7497で示されている方法を利用してP2O5含量を測定することも可能であり、これにより分析の幅が広がります。石灰質材料の適切な評価において、EN 12945:2014+A1:2016はリファレンスとなるべき基準です。したがって、この標準は、石灰材料の中和価値を確実に測定するために不可欠であり、業界全体の効率的な運用に貢献しています。
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