SIST EN ISO 5398-2:2009

Leather - Chemical determination of chromic oxide content - Part 2: Quantification by colorimetric determination (ISO 5398-2:2009)

ISO 5398-2:2009 describes the determination of chrome by colorimetric means. It is applicable to leathers which are expected to have chromic oxide contents in excess of 0,05 %. This is an analysis for total chromium in leather; it is not compound specific or specific to its oxidation state.

Leder - Chemische Bestimmung des Chromoxidgehaltes - Teil 2: Bestimmung durch Kolorimetrie (ISO 5398-2:2009)

Dieser Teil der ISO 5398 beschreibt die Bestimmung von Chrom durch kolorimetrische Geräte und ist vorgesehen
für Leder, bei denen Chromoxidgehalte von mehr als 0,05 % vermutet werden.
Im vorliegenden Fall handelt es sich um eine Analyse des Gesamtchromgehaltes in Leder, die nicht verbindungsspezifisch
oder spezifisch für die Oxidationsstufe ist.

Cuir - Dosage de l'oxyde de chrome - Partie 2: Quantification par dosage colorimétrique (ISO 5398-2:2009)

L'ISO 5398‑2:2009 décrit le dosage du chrome par des moyens colorimétriques. Elle est applicable aux cuirs susceptibles d'avoir des teneurs en oxyde de chrome supérieures à 0,05 %.
Il s'agit d'une analyse du chrome total dans le cuir qui n'est spécifique ni d'un composant particulier ni de l'état d'oxydation.

Usnje - Kemijsko določevanje kromovega oksida - 2. del: Kvantitativno kolorimetrijsko določevanje (ISO 5398-2:2009)

General Information

• Status: Published
• Publication Date: 31-Mar-2009
• ICS: 59.140.30 - Leather and furs
• Technical Committee: IUSN - Leather
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 30-Mar-2009
• Due Date: 04-Jun-2009
• Completion Date: 01-Apr-2009
• Ref Project: EN ISO 5398-2:2009 - Leather - Chemical determination of chromic oxide content - Part 2: Quantification by colorimetric determination (ISO 5398-2:2009)

Overview

EN ISO 5398-2:2009 - Leather - Chemical determination of chromic oxide content - Part 2: Quantification by colorimetric determination - specifies a colorimetric laboratory method to quantify chromic oxide (Cr2O3) in leather. It is intended for leathers expected to contain chromic oxide in excess of 0.05% (w/w, dry basis). The method determines total chromium reported as chromic oxide; it is not compound-specific and does not distinguish chromium oxidation states.

Key topics and technical requirements

• Scope and purpose: Quantification of chromium in leather by colorimetric means (spectrophotometry), suitable above 0.05% Cr2O3.
• Sample preparation: Follow ISO sampling and grinding guidance (ISO 2418, ISO 4044) and weigh representative ground samples (typical mass given in the standard).
• Ashing and fusion:
  • Pre-ash and ash sample (document specifies ashing at 750 °C ± 50 °C for 4 h).
  • Perform an alkaline fusion of the ash using a fusion mixture (sodium carbonate, potassium carbonate, sodium tetraborate) to solubilize chromium as hexavalent species.
• Colorimetric reaction:
  • Convert chromium to hexavalent state, react with 1,5-diphenylcarbazide to form diphenylcarbazone.
  • Measure absorbance at 540 nm using a spectrophotometer (minimum 3 decimal places) in 1 cm cuvettes.
• Reagents and apparatus:
  • Analytical-grade chemicals; distilled water per ISO 3696.
  • Required apparatus includes crucibles, muffle furnace, filtration device with ash-free paper, and a spectrophotometer.
• Calibration and quality control:
  • Use potassium dichromate standard solutions for calibration.
  • Observe specified timing (measure 15 ± 5 minutes after reagent addition) and stability notes (e.g., solution stable up to 4 days for >0.5% Cr2O3).
• Result expression: Results reported as percent chromic oxide on a dry-matter basis; repeatability and reporting requirements are included.

Applications and users

• Intended for leather testing laboratories, quality control teams in tanneries, material compliance and regulatory testing.
• Practical uses include:
  • Verifying chromium tanning levels for product specifications.
  • Quality assurance during leather processing.
  • Regulatory and safety checks where chromium content must be quantified.
• Suitable when moderate laboratory equipment is available (spectrophotometer rather than ICP or AAS).

Related standards

• ISO 5398 series (general title: Chemical determination of chromic oxide content):
  • Part 1: Quantification by titration
  • Part 2: Colorimetric determination (this document)
  • Part 3: Atomic absorption spectrometry
  • Part 4: ICP-OES
• Normative references cited: ISO 2418, ISO 3696, ISO 4044, ISO 4684

Keywords: EN ISO 5398-2:2009, chromic oxide, leather testing, colorimetric determination, chromium analysis, spectrophotometer, diphenyl carbazide, alkaline fusion.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2009
8VQMH.HPLMVNRGRORþHYDQMHNURPRYHJDRNVLGDGHO.YDQWLWDWLYQR
NRORULPHWULMVNRGRORþHYDQMH,62
Leather - Chemical determination of chromic oxide content - Part 2: Quantification by
colorimetric determination (ISO 5398-2:2009)
Leder - Chemische Bestimmung des Chromoxidgehaltes - Teil 2: Bestimmung durch
Kolorimetrie (ISO 5398-2:2009)
Cuir - Dosage de l'oxyde de chrome - Partie 2: Quantification par dosage colorimétrique
(ISO 5398-2:2009)
Ta slovenski standard je istoveten z: EN ISO 5398-2:2009
ICS:
59.140.30 Usnje in krzno Leather and furs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 5398-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2009
ICS 59.140.30
English Version
Leather - Chemical determination of chromic oxide content - Part
2: Quantification by colorimetric determination (ISO 5398-
2:2009)
Cuir - Dosage chimique de l'oxyde de chrome - Partie 2: Leder - Chemische Bestimmung des Chromoxidgehaltes -
Quantification par dosage colorimétrique (ISO 5398- Teil 2: Gehaltsbestimmung durch kolorimetrische
2:2009) Bestimmung (ISO 5398-2:2009)
This European Standard was approved by CEN on 19 December 2008.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 5398-2:2009: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 5398-2:2009) has been prepared by Technical Committee CEN/TC 289 "Leather", the
secretariat of which is held by UNI, in collaboration with the International Union of Leather Technologists and
Chemists Societies (IULTCS).
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 July 2009, and conflicting national standards shall be withdrawn at the
latest by July 2009.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

INTERNATIONAL ISO
STANDARD 5398-2
IULTCS/IUC
8:2
First edition
2009-01-15
Leather — Chemical determination of
chromic oxide content —
Part 2:
Quantification by colorimetric
determination
Cuir — Dosage chimique de l'oxyde de chrome —
Partie 2: Quantification par dosage colorimétrique

Reference number
ISO 5398-2:2009(E)
IULTCS/IUC 8:2:2009(E)
©
ISO 2009
ISO 5398-2:2009(E)
IULTCS/IUC 8:2:2009(E)
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ISO 5398-2:2009(E)
IULTCS/IUC 8:2:2009(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Principle. 1
5 Sampling and sample preparation. 2
6 Reagents. 2
6.1 Alkaline fusion method . 2
6.2 Photometric determination . 2
7 Apparatus . 2
8 Methods . 3
8.1 Alkaline fusion method . 3
8.2 Measurement of the aqueous solution. 3
8.3 Preparation of the calibration solution. 3
9 Check of the analytical system . 4
10 Calculation and expression of results. 4
10.1 General. 4
10.2 Repeatability. 4
11 Test report . 5
Annex A (informative) Determination of water and other volatile matter . 6

ISO 5398-2:2009(E)
IULTCS/IUC 8:2:2009(E)
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. Each 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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. 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.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 5398-2 was prepared by the European Committee for Standardization (CEN) Technical Committee
CEN/TC 289, Leather, in collaboration with the Chemical Tests Commission of the International Union of
Leather Technologists and Chemists Societies (IUC Commission, IULTCS), in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement). It is based on IUC 8
originally published in J. Soc. Leather Tech. Chem., 49, p. 17, 1965, and declared an official method of the
IULTCS in 1965.
IULTCS, originally formed in 1897, is a world-wide organization of professional leather societies to further the
advancement of leather science and technology. IULTCS has three Commissions, which are responsible for
establishing international
...