EN ISO 10693:2014

Soil quality - Determination of carbonate content - Volumetric method (ISO 10693:1995)

Specifies a method for the determination of carbonate content in soil samples. Applicable to all types of air-dried soil samples.

Bodenbeschaffenheit - Bestimmung des Carbonatgehaltes - Volumetrisches Verfahren (ISO 10693:1995)

Diese Internationale Norm legt ein Verfahren zur Bestimmung des Carbonatgehaltes von Bodenproben fest.
Dieses Verfahren ist für alle Arten lufttrockener Bodenproben anwendbar.

Qualité du sol - Détermination de la teneur en carbonate - Méthode volumétrique (ISO 10693:1995)

La présente Norme internationale prescrit une méthode de détermination de la teneur en carbonate d'échantillons de sol. Elle s'applique à tous les types d'échantillons de sol séchés à l'air.

Kakovost tal - Določevanje karbonatov - Volumetrijska metoda (ISO 10693:1995)

Standard EN-ISO 10693 navaja metodo za določevanje karbonatov v vzorcih tal. Uporablja se za vse vrste tal, sušenih na zraku.

General Information

• Status: Published
• Publication Date: 25-Mar-2014
• Withdrawal Date: 29-Sep-2014
• ICS: 13.080.10 - Chemical characteristics of soils
• Technical Committee: CEN/TC 444 - Environmental characterization
• Drafting Committee: CEN/TC 444/WG 3 - Inorganic analysis
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 26-Mar-2014
• Due Date: 05-Dec-2014
• Completion Date: 26-Mar-2014
• Ref Project: SIST EN ISO 10693:2014 - Soil quality - Determination of carbonate content - Volumetric method (ISO 10693:1995)

Overview

EN ISO 10693:2014 (ISO 10693:1995) specifies a volumetric method for the determination of carbonate content in air-dried soil samples. The procedure uses acid decomposition of carbonates and quantifies the evolved carbon dioxide with a Scheibler apparatus. The carbonate content is reported as an equivalent concentration of calcium carbonate (CaCO3) and applies to all types of air-dried soils prepared according to ISO 11464.

Key Topics

• Principle: Hydrochloric acid reacts with carbonates to release CO2. The gas volume is measured and compared with CaCO3 standards to calculate carbonate content.
• Primary equipment: Scheibler apparatus (single-sample unit), reaction vessels (150 ml), plastic cups (10 ml), calibrated U-tube, storage vessel with water, stop-cocks and an analytical balance (accuracy 0.1 mg).
• Reagents and materials: Analytical-grade water (conductivity ≤ 0.2 mS/m at 25 °C), hydrochloric acid c(HCl) = 4 mol/l (prepared by diluting 340 ml concentrated HCl to 1 000 ml), and calcium carbonate powder as standard.
• Sample prep: Use the <2 mm fraction of air-dried soil pretreated per ISO 11464. Determine water content per ISO 11465 to report dry-mass results.
• Operation notes:
  • Add 20 ml water to the reaction vessel and place the weighed test portion inside.
  • Fill the plastic cup with ~7 ml HCl and place it in the vessel, ensuring no contact with the soil until the vessel is closed and connected to the Scheibler unit.
  • Shake until the CO2 volume stabilizes (typically around 5 min; not longer than 1 h) and measure to 0.1 ml accuracy.
  • Include two blanks and CaCO3 standards (0.200 g and 0.400 g) in each series.
• Interferences: Other gases (e.g., H2S from sulfides) can inflate CO2 readings. When sulfides are present, HgCl2 may be added to the acid to precipitate sulfide as HgS before measurement.
• Quality: The standard defines repeatability and requires temperature-controlled measurements; results are reported on an oven-dry basis.

Applications

• Soil quality assessment and monitoring
• Agronomy and fertilizer/liming planning
• Environmental site characterization and remediation decision-making
• Baseline surveys for carbon and mineral investigations

Related Standards

• ISO 11464 - Soil pretreatment for physico-chemical analyses
• ISO 11465 - Determination of dry matter and water content (gravimetric)
• ISO 3696 - Water for analytical laboratory use
• ISO 5725 - Precision of test methods (repeatability/reproducibility)

This standard offers a practical, repeatable laboratory method to quantify carbonate content using a volumetric CO2 measurement. It is widely used by environmental laboratories, agronomists and soil scientists for routine soil characterization and decision support.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2014
.DNRYRVWWDO'RORþHYDQMHNDUERQDWRY9ROXPHWULMVNDPHWRGD,62
Soil quality - Determination of carbonate content - Volumetric method (ISO 10693:1995)
Bodenbeschaffenheit - Bestimmung des Carbonatgehaltes - Volumetrisches Verfahren
(ISO 10693:1995)
Qualité du sol - Détermination de la teneur en carbonate - Méthode volumétrique (ISO
10693:1995)
Ta slovenski standard je istoveten z: EN ISO 10693:2014
ICS:
13.080.10 .HPLMVNH]QDþLOQRVWLWDO Chemical characteristics of
soils
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 10693
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2014
ICS 13.080.10
English Version
Soil quality - Determination of carbonate content - Volumetric
method (ISO 10693:1995)
Qualité du sol - Détermination de la teneur en carbonate - Bodenbeschaffenheit - Bestimmung des Carbonatgehaltes -
Méthode volumétrique (ISO 10693:1995) Volumetrisches Verfahren (ISO 10693:1995)
This European Standard was approved by CEN on 13 March 2014.

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

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10693:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
The text of ISO 10693:1995 has been prepared by Technical Committee ISO/TC 190 “Soil quality” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 10693:2014 by
Technical Committee CEN/TC 345 “Characterization of soils” the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by September 2014, and conflicting national standards shall be
withdrawn at the latest by September 2014.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: 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 the United Kingdom.
Endorsement notice
The text of ISO 10693:1995 has been approved by CEN as EN ISO 10693:2014 without any modification.

INTERNATIONAL
ISO
STANDARD
First edition
1995-03-15
Soil quality - Determination of carbonate
content - Volumetric method
Quakt& du sel - Determination de Ia teneur en carbonate - Methode
volum6 trique
Reference number
ISO 10693:1995(E)
OS0 10693:1995(ET)
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national Standards bodies (ISO member bodies). The work
of preparing International Standards is normally carried out through ISO
technical committees. Esch member body interested in a subject for
which a technical committee has been established has the right to be
represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work. ISO
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 10693 was prepared by Technical Committee
ISOnC 190, Seil quality, Subcommittee SC 3, Chemical methods and seil
characteris tics.
Annexes A and B of this International Standard are for information only.
0 ISO 1995
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-121 1 Geneve 20 l Switzerland
Printed in Switzerland
ISO 10693:1995(E)
INTERNATIONAL STANDARD Q ISO
Determination of carbonate content -
Soil quality -
Volumetric method
3 Principle
1 Scope
This International Standard specifies a method for the
Hydrochlorit acid is added to a soil Sample to de-
determination of carbonate content in soil samples.
compose any carbonates present. The reaction in
simplified form reads as follows (Me means metal):
lt is applicable to all types of air-dried soil samples.
MeCO, + 2H+ -+ Me*+ + H,CO,
2 Normative references
H,CO, -+ H,O + CO, (gaseous state)
The following Standards contain provisions which,
The volume of the carbon dioxide produced is meas-
through reference in this text, constitute provisions
ured by using a Scheibler apparatus (5.1), and is
of this International Standard. At the time of publica-
compared with the volume of carbon dioxide pro-
tion, the editions indicated were valid. All Standards
duced by pure Calcium carbonate. To avoid making
and Parties to agreements
are subject to revision,
corrections for differentes in temperature and press-
based on this International Standard are encouraged
ure, all determinations are carried out under the same
to investigate the possibility of applying the most re-
conditions. The determination should be carried out in
cent editions of the Standards indicated below.
a temperature-controlled room.
Members of IEC and ISO maintain registers of cur-
NOTES
rently valid International Standards.
1 The carbonate content is expressed as an equivalent
ISO 3696: 1987, VVa ter for analytical laboratory use -
concentration of Calcium carbonate (CaCO,). In fact all car-
Specifica tion and tes t me thods.
bonates and bicarbonates present in the Sample are meas-
ured. Many carbonates appear in the form of calcite and
ISO 11464:1994, Seil quality - Pretreatment of sam-
aragonite (CaCO,), dolomite [CaMg(CO,),], siderite (FeCO,)
ples for physico-Chemical analyses.
and rhodochrosite (MnCO,). In soils in dry (arid) regions,
soda (Na,CO,~1OH,O) may be present. When it is known
ISO 11465:1993, Seil quality - Determination of dry
Qhat a certain form of carbonate, other than Calcium
matter and water content on a mass basis - carbonate, is mainly present in the soil under study, the final
concentration of this form tan be used.
Gravimetric method.
2 Other gases that are produced [e.g. hydrogen sulfide
(H2S) in samples of anaerobic soil containing sulfides] may
result in an overestimate of the carbonate content. In these
cases the gas produced should be purified and its volume
measured in another way (see [l] in annex A). When sul-
fides are known to be present in the soil samples,
mercury(ll) chloride (HgCI,) is added to the hydrochloric acid
Solution to form insoluble mercury(ll) sulfide (HgS).
4 Reagents
Use only reagents of recognized analytical grade.
4.1 Water, with a specific electrical conductivity not
higher than 0,2 mS/m at 25 “C (conforming to
grade 2 of ISO 3696).
4.2 Hydrochlorit acid, c(HCI) = 4 mol/l.
Dilute 340 ml of co
...