Fertilizers - Determination of boron in concentrations > 10 % using acidimetric titration

This European Standard specifies a method for the determination of total and water extractable boron in mineral fertilizers containing more than 10 % boron.
This method is applicable to water and aqua regia fertilizer extracts obtained according to EN 16962 and/or EN 16964.
NOTE   A method used for the determination of boron in mineral fertilizers containing less than or equal to 10 % of boron (spectrophotometric determination by azomethine-H) can be also used for the scope of this method after appropriate dilution of the extracts.

Düngemittel - Bestimmung von Bor in Konzentrationen > 10 % durch azidimetrische Titration

Diese Europäische Norm legt ein Verfahren zur Bestimmung von Gesamt- und aus Wasser extrahierbarem Bor in mineralischen Düngemitteln, die mehr als 10 % Bor enthalten, fest.
Dieses Verfahren ist auf Wasser  und Königswasser Extrakte von Düngemitteln anwendbar, die nach EN 16962 und/oder EN 16964 erhalten wurden.
Das Verfahren kann nach entsprechender Verdünnung der Extrakte auch für die Bestimmung von Bor in mineralischen Düngemitteln, die weniger oder gleich 10 % Bor enthalten (spektrophotometrische Bestimmung mit Azomethin H), verwendet werden.

Engrais - Dosage du bore dans des concentrations > 10 % par titration acidimétrique

La présente Norme européenne spécifie une méthode pour le dosage du bore total et du bore extractible à l’eau dans des engrais minéraux contenant plus de 10 % de bore.
Cette méthode est applicable aux extraits d’engrais aqueux et à l’eau régale obtenus conformément à l’EN 16962 et/ou à l’EN 16964.
NOTE   Une méthode utilisée pour le dosage du bore dans des engrais minéraux contenant moins de ou égal à 10 % de bore (dosage spectrophotométrique avec l’azométhine H) peut également être utilisée dans le cadre du domaine d’application de la présente méthode après dilution appropriée des extraits.

Gnojila - Določevanje bora v koncentracijah, večjih od 10 %, s kislinsko titracijo

Ta evropski standard določa postopek za določevanje skupne vsebnosti bora in bora, ki ga je mogoče ekstrahirati z vodo, v mineralnih gnojilih, ki vsebujejo več kot 10 % bora.
Ta metoda se uporablja za ekstrakte gnojil v vodi in zlatotopki, pridobljene v skladu s standardom prEN 16962 in/ali prEN 16964.
OPOMBA:    Metodo, ki se uporablja za določevanje vsebnosti bora v mineralnih gnojilih, ki vsebujejo manj kot 10 % bora (spektrofotometrično določevanje z azometinom-H), je mogoče uporabiti tudi za obseg te metode po ustreznem redčenju ekstraktov.

General Information

Status
Published
Public Enquiry End Date
06-Nov-2016
Publication Date
09-Jul-2018
ICS
65.080 - Fertilizers
Technical Committee
KAT - Soil quality
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
22-Jun-2018
Due Date
27-Aug-2018
Completion Date
10-Jul-2018
Directive
2003/2003 - Regulation (EC) N° 2003/2003 of the European Parlament and of the council of 13 October 2003 relating to fertilisers
2019/1009 - Regulation (EU) 2019/1009 of the European Parliament and of the Council of 5 June 2019 laying down rules on the making available on the market of EU fertilising products and amending Regulations (EC) No 1069/2009 and (EC) No 1107/2009 and repealing Regulation (EC) No 2003/2003
Mandate
M/335 - Standardization Mandate assigned to the CEN concerning the modernisation of the methods of anylysis of Fertilizers
Ref Project
EN 17042:2018 - Fertilizers - Determination of boron in concentrations > 10 % using acidimetric titration

Overview

EN 17042:2018 (CEN) defines a standardized acidimetric titration method for determining boron in mineral fertilizers containing more than 10% boron. The procedure measures total and water‑extractable boron in fertilizer extracts prepared according to EN 16962 (water extracts) and/or EN 16964 (aqua regia extracts). The method forms a mannitol–boric acid complex and titrates it with sodium hydroxide to a defined pH endpoint, offering a validated laboratory option when ICP‑AES is not available.

Key topics and technical requirements

  • Scope: Applicable to mineral fertilizers with >10% B; spectrophotometric azomethine‑H (for ≤10% B) may be used after appropriate dilution.
  • Principle: Boric acid forms a complex with D‑mannitol; the complex is titrated to pH 6.3 using a standardized NaOH solution.
  • Sample extracts: Use extracts prepared per EN 16962 (water) or EN 16964 (aqua regia).
  • Reagents & apparatus:
    • Mannitol, methyl red indicator, NaCl, HCl, CO2‑free NaOH solutions.
    • pH meter with glass electrode, magnetic stirrer, volumetric flasks.
  • Standardization: The 0.025 mol/L NaOH titrant must be standardized; 1 mL of an exactly 0.025 mol/L NaOH corresponds to 0.27025 mg boron (used in calculations).
  • Procedure highlights:
    • Take an aliquot containing ~2–4 mg B, add water, methyl red, acidify as needed, add NaCl and boil to remove CO2.
    • Adjust pH ~5 with 0.5 mol/L NaOH, then titrate to pH 6.3 with 0.025 mol/L NaOH after adding mannitol.
    • Run a full blank and a calibration check to calculate the boron content.
  • Reporting: Results must reference EN 17042, state extraction method, report full test details, sampling info and whether repeatability requirements (validation) were met.

Applications and practical value

  • Laboratories analyzing high‑boron fertilizers: Provides a validated, low‑cost alternative to instrumental techniques.
  • Quality control & regulatory compliance: For manufacturers and testing bodies assessing declared boron content in fertilizer products.
  • Situations without ICP‑AES access: Acidimetric titration is reliable and suitable when ICP‑AES (EN 16963) is unavailable.
  • Research and validation: Useful for method cross‑checks-EN 17042 includes verification data comparing titration with ICP‑AES.

Related standards

  • EN 16962 - Extraction of water‑soluble micro‑nutrients in fertilizers
  • EN 16964 - Extraction of total micro‑nutrients using aqua regia
  • EN 16963 - ICP‑AES determination of boron (instrumental alternative)
  • EN 1482‑2, EN 12944‑1/2, EN ISO 3696 - sampling, vocabulary, and laboratory water quality

Keywords: EN 17042:2018, boron determination, acidimetric titration, fertilizer analysis, mannitol titration, water extractable boron, aqua regia extracts, CEN standard, ICP‑AES alternative.

Frequently Asked Questions

SIST EN 17042:2018 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Fertilizers - Determination of boron in concentrations > 10 % using acidimetric titration". This standard covers: This European Standard specifies a method for the determination of total and water extractable boron in mineral fertilizers containing more than 10 % boron. This method is applicable to water and aqua regia fertilizer extracts obtained according to EN 16962 and/or EN 16964. NOTE A method used for the determination of boron in mineral fertilizers containing less than or equal to 10 % of boron (spectrophotometric determination by azomethine-H) can be also used for the scope of this method after appropriate dilution of the extracts.

This European Standard specifies a method for the determination of total and water extractable boron in mineral fertilizers containing more than 10 % boron. This method is applicable to water and aqua regia fertilizer extracts obtained according to EN 16962 and/or EN 16964. NOTE A method used for the determination of boron in mineral fertilizers containing less than or equal to 10 % of boron (spectrophotometric determination by azomethine-H) can be also used for the scope of this method after appropriate dilution of the extracts.

SIST EN 17042:2018 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 17042:2018 is associated with the following European legislation: EU Directives/Regulations: 2003/2003, 2019/1009; Standardization Mandates: M/335. 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 17042:2018 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.Düngemittel - Bestimmung von Bor in Konzentrationen > 10 % durch azidimetrische TitrationEngrais - Dosage du bore dans des concentrations > 10 % par titration acidimétriqueFertilizers - Determination of boron in concentrations > 10 % using acidimetric titration65.080GnojilaFertilizersICS:Ta slovenski standard je istoveten z:EN 17042:2018SIST EN 17042:2018en,fr,de01-september-2018SIST EN 17042:2018SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 17042
June
t r s z ICS
x wä r z r English Version
Fertilizers æ Determination of boron in concentrations
µ
s r
¨ using acidimetric titration Engrais æ Dosage du bore dans des concentrations
µ
s r
¨ par titrage acidimétrique
Düngemittel æ Bestimmung von Bor in Konzentrationen
µ
s r
¨ durch azidimetrische Titration This European Standard was approved by CEN on
t x February
t r s zä
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 Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels
t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s y r v tã t r s z ESIST EN 17042:2018

European foreword . 3 Introduction . 4 1 Scope . 5 2 Normative references . 5 3 Terms and definitions . 5 4 Principle . 5 5 Sampling and sample preparation . 5 6 Reagents . 6 7 Apparatus . 6 8 Procedure. 7 8.1 Test solution . 7 8.2 Blank solution . 7 8.3 Boron (B) value of the sodium hydroxide solution (6.5) . 7 9 Calculation and expression of the results . 8 10 Test report . 8 Annex A (informative)
Verification data — Comparison of ICP-AES method and acidimetric titration method . 9 A.1 Introduction . 9 A.2 Validation based on water extraction. 9 A.2.1 Test materials used in the validation study . 9 A.2.2 Results of the validation study . 9 A.2.3 Conclusions . 10 A.3 Validation based on aqua regia extraction . 10 A.3.1 Test materials used in the validation study . 10 A.3.2 Results of the validation study . 11 A.3.3 Conclusions . 12 Bibliography . 13
= 100 mg/l. Weigh to the nearest 0,1 mg 0,571 9 g of boric acid (H3BO3), dissolve in water (6.1), transfer quantitatively into a 1 000 ml volumetric flask (7.6), make up to volume with water (6.1) and mix thoroughly. Transfer to a plastic bottle for storage in a refrigerator at 4 °C to 8 °C. Commercially available stock solution with adequate specification may be used. The solution is generally considered to be stable for one year, but in reference to guaranteed stability, the recommendations of the manufacturer shall be considered. 6.7 D-mannitol, (C6H14O6) powder. 6.8 Sodium chloride (NaCl). 7 Apparatus 7.1 pH meter, with glass electrode. 7.2 Magnetic stirrer. 7.3 Beaker, capacity 400 ml. 7.4 Polytetrafluoroethylene (PTFE) (Teflon®)1) rod. 7.5 Volumetric flasks, capacity 100 ml.
1) This information is given for the convenience of users of this document and does not constitute an endorsement by CEN of the product named. Equivalent products may be used if they can be shown to lead to the same results. SIST EN 17042:2018
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.

Loading comments...