This document describes a method for the determination of chromium in aqueous solution obtained from leather. This is an analysis for total chromium in leather; it is not compound specific or specific to its oxidation state. This method describes the determination of chrome by iodometric titration and is to be applicable to chromium-tanned leathers which are expected to have chromic oxide contents in excess of 0,3 %. Two different methods are described as alternatives for obtaining chromium in a suitable solution. It is appropriate to use either method.
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Sisällysluettelo
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Sampling and sample preparation
6 Reagents
6.1 Wet oxidation method
6.2 Alkaline fusion method
6.3 Iodometric titration
7 Apparatus
8 Methods
8.1 Preparation of analytical solution
8.2 Measurement of the aqueous solution
9 Calculation and expression of results
9.1 General
9.2 Repeatability
10 Test report
Annex A Determination of water and other volatile matter (informative)
ISO 2418:2017 Leather -- Chemical, physical and mechanical and fastness tests -- Sampling location
ISO 3696:1987 Water for analytical laboratory use -- Specification and test methods
ISO 4044:2017 Leather -- Chemical tests -- Preparation of chemical test samples
ISO 2418:2017 Leather -- Chemical, physical and mechanical and fastness tests -- Sampling location
ISO 3696:1987 Water for analytical laboratory use -- Specification and test methods
ISO 4044:2017 Leather -- Chemical tests -- Preparation of chemical test samples
ISO 4047:1977 Leather -- Determination of sulphated total ash and sulphated water-insoluble ash
ISO 4684:2005 Leather -- Chemical tests -- Determination of volatile matter