Leather and fur - Chemical determination of metal content - Part 2: Total metal content
WARNING: The concentrated acids used in this document are very corrosive and/or oxidizing liquids, which could raise the possibility of fire or explosion in the event of contact with ignitable materials. They might cause acute or chronic health dangers as well. Moreover, they are hazardous to water. Suitable safety measures are therefore necessary during the test with them, and attention shall be paid to avoid possible explosive reactions caused by direct contact between perchloric acid and samples.
1 Scope
This document specifies a method for the determination of the total content of 24 metals in leather and fur, including: aluminum (Al), arsenic (As), barium (Ba), calcium (Ca), cadmium (Cd), cobalt (Co), chromium (Cr), copper (Cu), iron (Fe), potassium (K), magnesium (Mg), sodium (Na), lead (Pb), manganese (Mn), molybdenum (Mo), nickel (Ni), mercury (Hg), antimony (Sb), selenium (Se), silicon (Si), tin (Sn), titanium (Ti), zinc (Zn) and zirconium (Zr)
This document is applicable for determining the total content of 24 metals in various types of leather and fur, and is also suitable for determining the content of non-metallic boron (B).
This document is not applicable for determining the total chromium content in chromium-tanned leather.
Note: See QB/T 2720, QB/T 5313, QB/T 5314 or QB/T 5315 for the determination of total chromium content in chromium-tanned leather.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 6682 Water for analytical laboratory use - Specification and test methods (GB/T 6682-2008; ISO 3696:1987, MOD)
GB/T 39364 Leather - Chemical, physical, mechanical and fastness tests - Sampling location (GB/T 39364-2020, ISO 2418:2017, MOD)
QB/T 1267 Fur - Chemical, physical and mechanical and fastness tests - Sampling location (QB/T 1267-2012, ISO 2418:2002, MOD)
QB/T 1272 Fur - Preparation of chemical test samples (QB/T 1272-2012, ISO 4044:2008, MOD)
QB/T 1273 Fur - Chemical tests - Determination of volatile matter (QB/T 1273-2012, ISO 4684:2005, MOD)
QB/T 1276 Fur - Chemical tests - Determination of matter soluble in carbon tetrachloride (QB/T 1276-2012, ISO 4048:2008, MOD)
QB/T 2716 Leather - Preparation of chemical test samples (QB/T 2716-2018, ISO 4044:2008, MOD)
QB/T 2717 Leather - Chemical tests - Determination of volatile matter (QB/T 2717-2018, ISO 4684:2005, MOD)
QB/T 2718 Leather - Chemical tests - Determination of matter soluble in dichloromethane (QB/T 2718-2018, ISO 4048:2008, MOD)
3 Terms and definitions
No terms and definitions are listed in this document.
4 Principle
Complete digestion of the sample of leather or fur is carried out using a ternary acid mixture (acid digestion) or microwave digestion instrument (microwave digestion). The residue is re-dissolved with water and determined for metal content by inductively coupled plasma optical emission spectrometer (ICP-OES), inductively coupled plasma mass spectrometer (ICP-MS), atomic absorption spectrometer (AAS) or atomic fluorescence spectrometer (AFS), and the total metal content in the sample is thus calculated.
Note: This document determines the total content of metal elements in leather and fur, not the content of metals in a specific combined or oxidized state.
5 Reagents and materials
5.1 Unless otherwise stated, analytical grade chemicals shall be used for acid digestion, and ultrapure acid shall be used for microwave digestion. All solutions are aqueous solutions.
5.2 Nitric acid, 60% to 70% concentration (by mass).
5.3 Sulfuric acid, 98% concentration (by mass).
5.4 Perchloric acid, 60% to 70% concentration (by mass).
Foreword II
Introduction V
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and materials
6 Apparatus
7 Sampling and sample preparation
8 Procedure
9 Calculation and expression of results
10 Test report
Annex A (Informative) Structural changes between this document and ISO 17072-2:2019
Annex B (Informative) Technical differences between this document and ISO 17072-2:2019 and their causes
Annex C (Normative) Preparation of standard solutions and standard working solutions for elements to be determined
Annex D (Informative) Determination wavelengths and inter-element interference for determination of elements using ICP-OES
Annex E (Informative) Analytical isotopes and limits of detection used in ICP-MS method
Annex F (Informative) Determination wavelengths and recommended test conditions for determination of elements using AAS
Annex G (Informative) Interlaboratory results comparison and limits of detection
Bibliography
