Carbonate liming materials - Determination of reactivity - Automatic titration method with citric acid

This European Standard specifies a method for the determination of the reactivity of calcium carbonate and calcium magnesium carbonate liming materials. It assesses the speed and effectiveness of their neutralising potential by automatic titration with citric acid.
This method is applicable only to liming materials with a maximum particle size of 6,3 mm determined according to EN 12948.
NOTE   For marble dolomite (BET procedure according to ISO 9277 below 500 m2/kg), see EN 14984.

Carbonatische Kalke - Bestimmung der Reaktivität - Automatisches Titrationsverfahren mit Citronensäure

Diese Europäische Norm legt ein Verfahren für die Bestimmung der Reaktivität von Calciumcarbonat sowie carbonatischen Calcium-/Magnesium-Bodenverbesserungsmitteln fest. Die Geschwindigkeit und Wirksamkeit deren Neutralisationspotentials werden durch automatische Titration mit Citronensäure beurteilt.
Dieses Verfahren ist nur für Calcium-/Magnesium-Bodenverbesserungsmittel mit einer Korngröße von höchstens 6,3 mm, bestimmt nach EN 12948, anwendbar.
ANMERKUNG   Für Marmordolomit (BET-Verfahren nach ISO 9277 unter 500 m2/kg), siehe EN 14984.

Amendements minéraux basiques carbonatés - Détermination de la réactivité - Méthode par titration automatique à l'acide citrique

La présente norme européenne spécifie une méthode de détermination de la réactivité des amendements minéraux basiques à base de carbonate de calcium ou à base de carbonate de calcium et de magnésium. Il évalue la rapidité et l'efficacité de leur potentiel de neutralisation par titration automatique à l'acide citrique.
Cette méthode s'applique uniquement aux amendements minéraux basiques ayant une taille de particules maximale de 6,3 mm déterminée selon l'EN 12948.
NOTE   Pour les dolomies d’origine métamorphique (de type marbre) (Procédure BET selon l’ISO 9277 en-dessous de 500 m²/kg), voir EN 14984.

Karbonatna sredstva za apnjenje - Določevanje reaktivnosti - Metoda avtomatske titracije s citronsko kislino

Ta evropski standard določa metodo za določevanje reaktivnosti sredstev za apnenje s kalcijevim karbonatom in kalcijevim magnezijevim karbonatom. Ugotavlja hitrost in učinkovitost njihovega nevtralizacijskega potenciala z avtomatsko titracijo s citronsko kislino. Ta metoda se uporablja samo za sredstva za apnenje z največjo velikostjo delcev 6,3 mm, ki je v skladu s standardom EN 12948.

General Information

Status
Published
Public Enquiry End Date
31-Jan-2012
Publication Date
02-Sep-2013
ICS
65.080 - Fertilizers
Technical Committee
KAT - Soil quality
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
26-Aug-2013
Due Date
31-Oct-2013
Completion Date
03-Sep-2013
Ref Project
EN 16357:2013 - Carbonate liming materials - Determination of reactivity - Automatic titration method with citric acid

Overview - EN 16357:2013 (CEN)

EN 16357:2013 specifies a laboratory method for determining the reactivity of carbonate liming materials (calcium carbonate and calcium–magnesium carbonate) by an automatic titration method with citric acid. The procedure assesses the speed and effectiveness of a liming material’s neutralising potential by measuring citric acid consumption under controlled pH conditions. The method applies to samples with a maximum particle size of 6.3 mm (EN 12948) and uses a partial reaction over a fixed time (15 minutes) at pH 4.5 (pH stat).

Key topics and technical requirements

  • Principle: Limited decomposition of carbonate by citric acid; titration under stable pH (pH stat) and measurement of citric acid consumed in a set time.
  • Apparatus: automatic motor-driven burette/titrator with pH electrode, pH stat programme, propeller or magnetic stirring, suitable beakers and balance. Burette must deliver small accurate steps (modern titrators meet this).
  • Reagents: mono-hydrated citric acid (solution ca. 457.17 g/L prepared and used within specified storage limits), analytical-grade water, defoamer, pH buffers (pH 4 and pH 7).
  • Sample size & preparation:
    • Typical test portion: 5.0 g (±0.2 g) “as received”.
    • For coarser or heterogeneous materials (>1 mm or non-representative), prepare fraction-wise and use 10 g test portion (Annex A).
    • Moisture should be recorded (EN 12048) and sample preparation per EN 1482-2.
  • Calibration & quality control: pH electrode calibration with pH 4 and pH 7 buffers, electrode response time check, verification with a reference precipitated calcium carbonate (PCC) where applicable.
  • Outputs: citric-acid based reactivity value, neutralising value correction, and MgO content determination; precision and reproducibility data are provided in Clause 9.

Applications and who uses it

  • Practical uses:
    • Quality control of liming materials and fertilizers.
    • Comparative evaluation of neutralising speed (reactivity) for agronomic performance.
    • Regulatory compliance testing and product labelling.
  • Primary users:
    • Fertilizer and liming material manufacturers.
    • Independent testing laboratories and conformity assessment bodies.
    • Agricultural extension services, soil scientists, agronomists and regulatory agencies.

Related standards

  • EN 12948 - Liming materials: determination of size distribution (max particle size reference).
  • EN 1482-2 - Sampling and sample preparation for fertilizers and liming materials.
  • EN 12048 - Moisture determination for fertilizers/liming materials.
  • EN 14984 - Specific guidance for marble dolomite (BET < 500 m2/kg).
  • EN ISO 3696 - Water for analytical laboratory use.

Keywords: EN 16357:2013, carbonate liming materials, reactivity, automatic titration, citric acid, pH stat, neutralising value, liming materials testing.

Frequently Asked Questions

SIST EN 16357:2013 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Carbonate liming materials - Determination of reactivity - Automatic titration method with citric acid". This standard covers: This European Standard specifies a method for the determination of the reactivity of calcium carbonate and calcium magnesium carbonate liming materials. It assesses the speed and effectiveness of their neutralising potential by automatic titration with citric acid. This method is applicable only to liming materials with a maximum particle size of 6,3 mm determined according to EN 12948. NOTE For marble dolomite (BET procedure according to ISO 9277 below 500 m2/kg), see EN 14984.

This European Standard specifies a method for the determination of the reactivity of calcium carbonate and calcium magnesium carbonate liming materials. It assesses the speed and effectiveness of their neutralising potential by automatic titration with citric acid. This method is applicable only to liming materials with a maximum particle size of 6,3 mm determined according to EN 12948. NOTE For marble dolomite (BET procedure according to ISO 9277 below 500 m2/kg), see EN 14984.

SIST EN 16357:2013 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 16357:2013 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Carbonatische Kalke - Bestimmung der Reaktivität - Automatisches Titrationsverfahren mit CitronensäureAmendements minéraux basiques carbonatés - Détermination de la réactivité - Méthode par titration automatique à l'acide citriqueCarbonate liming materials - Determination of reactivity - Automatic titration method with citric acid65.080GnojilaFertilizersICS:Ta slovenski standard je istoveten z:EN 16357:2013SIST EN 16357:2013en,fr,de01-oktober-2013SIST EN 16357:2013SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16357
August 2013 ICS 65.080 English Version
Carbonate liming materials - Determination of reactivity - Automatic titration method with citric acid
Amendements minéraux basiques carbonatés - Détermination de la réactivité - Méthode par titration automatique à l'acide citrique
Carbonatische Kalke - Bestimmung der Reaktivität - Automatisches Titrationsverfahren mit Citronensäure This European Standard was approved by CEN on 29 June 2013.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 16357:2013: ESIST EN 16357:2013

Preparation of the test portion of liming materials coarser than 1 mm . 14 A.1 General . 14 A.2 Calculation of mass fractions retained on the test sieves . 14 A.3 Calculation of the test portion to be weighed . 14 Annex B (normative)
Arrangement of the test apparatus . 15 Bibliography. 16
= 457,17 g/l. Preferably, use a fresh home-made solution as described below. Under these conditions, the solution concentration is conventionally supposed to be equal to the necessary one, ca = 457,17 g pure citric acid per litre. SIST EN 16357:2013

is the added mass of mono hydrated citric acid (5.2), in grams; 192,14 is the molar mass of anhydrous citric acid, in grams; 210,14 is the molar mass of mono hydrated citric acid, in grams. 5.4 Calcium carbonate, precipitated (or PCC), mass fraction, w(CaCO3) at least 99 %. Commercial PCC for analysis is granted for its chemical characteristics. However, physical characteristics are not granted. As reactivity depends on fineness, even for PCC, it is essential to take as a reference a highly reactive PCC, such as commercial PCC from VWR / Prolabo / BDH, reference GPR, Rectapur, Ref 22296.294, Molar mass 100,09 1), which will consume 15 ml after 15 min. This PCC was used in the ring test before launching measurements. By experience, some PCC do not meet this requirement. See also the note in 7.2.6. 5.5 Silicone defoamer. 5.6 Standard buffer solution, pH 4 (commercial solution, pH 4,01). NOTE This solution has a limited lifetime. 5.7 Standard buffer solution, pH 7 (commercial solution, pH 6,98). NOTE This solution has a limited lifetime. 6 Sampling and sample preparation 6.1 General Sampling is not part of the methods specified in this document. A recommended sampling method is given in EN 1482-1. Sample preparation shall be carried out in accordance with EN 1482-2.
1) This substance is an example of a suitable product available commercially. This information is given for the convenience of users of this European Standard and does not constitute an endorsement by CEN of this product. SIST EN 16357:2013
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