ISO 17075-1:2017 PDF

Leather — Chemical determination of chromium(VI) content in leather — Part 1: Colorimetric method

Название (английский):

ISO 17075-1:2017

Leather — Chemical determination of chromium(VI) content in leather — Part 1: Colorimetric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 2 февраля 2017 г.
Издание:: ISO IS 17075 edition 1 version 1
ICS:: 59.140.30

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Описание (английский):

ISO 17075-1:2017 specifies a method for determining chromium(VI) in solutions leached from leather under defined conditions. The method described is suitable to quantify the chromium(VI) content in leathers down to 3 mg/kg. ISO 17075-1:2017 is applicable to all leather types. The results obtained from this method are strictly dependent on the extraction conditions. Results obtained by using other extraction procedures (extraction solution, pH, extraction time, etc.) are not comparable with the results produced by the procedure described in this document. If a leather sample is tested with both this document and ISO 17075-2, the results obtained with ISO 17075-2 are considered as the reference. The advantage of the method described in ISO 17075-2 is that there are no interferences from the colour of the extract. Nevertheless, interlaboratory trials do not show significant differences (see Annex C) and the results are comparable between both methods.

Технические детали

Технический комитет: IULTCS - International Union of Leather Technologists and Chemists Societies
SKU: ISO 17075-1:2017

Abstract

Overview

ISO 17075-1:2017 - Leather - Chemical determination of chromium(VI) content in leather - Part 1: Colorimetric method defines a laboratory procedure to quantify extractable chromium(VI) in leather. The standard specifies a colorimetric assay based on 1,5‑diphenylcarbazide (DPC) that yields a red/violet complex measured photometrically at 540 nm, and is suitable for results down to 3 mg/kg (expressed on dry mass). The method is applicable to all leather types and stresses that extraction conditions (solution, pH, time) directly determine reported values.

Key topics and requirements

Extraction conditions: Leaching of chromium(VI) is carried out in a phosphate buffer at pH 7.0–8.0 under defined degassed conditions (argon or nitrogen) - results are strictly dependent on these parameters.
Sample prep and mass: Typical analytical sample ≈ 2 g cut to small pieces (ISO 4044 referenced); extraction performed with mechanical shaking (≈ 3 h at ~100 min‑1).
Colorimetric reaction: Chromium(VI) oxidizes DPC to form a colored complex measured at 540 nm; absorbance is used for quantification.
Interference control: Co‑extracted dyes and coloured substances can be removed using solid phase extraction (SPE) cartridges (e.g., RP C18 or activated magnesium silicate) prior to colorimetric analysis.
Calibration and standards: The standard provides procedures for preparing calibration and stock solutions (potassium dichromate used as a chromium(VI) standard).
Detection limit and comparability: Method quantifies down to 3 mg/kg; results are not comparable with other extraction procedures unless those follow the same conditions. If both ISO 17075‑1 and ISO 17075‑2 are used, ISO 17075‑2 (ion chromatography) is considered the reference method.
Quality controls: Blank, calibration, and recovery checks (including matrix and SPE influences) are required.

Applications and users

ISO 17075-1:2017 is used for:

Leather manufacturers and finishers for in‑house quality control.
Independent testing laboratories performing compositional analysis.
Product compliance and safety teams assessing chromium(VI) content in leather goods.
Material scientists and R&D evaluating tanning processes and mitigation measures. Practical uses include batch release testing, supplier verification, and investigation of colored/leather treated materials where a colorimetric approach is suitable.

Related standards

ISO 17075-2 - Ionic chromatography method (reference method; fewer color interferences).
ISO 2418 - Sampling location for leather testing.
ISO 4044:2017 - Preparation of chemical test samples.
ISO 3696 - Water for analytical use.

Keywords: ISO 17075-1:2017, chromium(VI) in leather, colorimetric method, leather testing, solid phase extraction, diphenylcarbazide, photometric detection, pH 7–8, limit of quantification 3 mg/kg.

Overview

Key topics and requirements

Extraction conditions: Leaching of chromium(VI) is carried out in a phosphate buffer at pH 7.0–8.0 under defined degassed conditions (argon or nitrogen) - results are strictly dependent on these parameters.
Sample prep and mass: Typical analytical sample ≈ 2 g cut to small pieces (ISO 4044 referenced); extraction performed with mechanical shaking (≈ 3 h at ~100 min‑1).
Colorimetric reaction: Chromium(VI) oxidizes DPC to form a colored complex measured at 540 nm; absorbance is used for quantification.
Interference control: Co‑extracted dyes and coloured substances can be removed using solid phase extraction (SPE) cartridges (e.g., RP C18 or activated magnesium silicate) prior to colorimetric analysis.
Calibration and standards: The standard provides procedures for preparing calibration and stock solutions (potassium dichromate used as a chromium(VI) standard).
Detection limit and comparability: Method quantifies down to 3 mg/kg; results are not comparable with other extraction procedures unless those follow the same conditions. If both ISO 17075‑1 and ISO 17075‑2 are used, ISO 17075‑2 (ion chromatography) is considered the reference method.
Quality controls: Blank, calibration, and recovery checks (including matrix and SPE influences) are required.

Applications and users

ISO 17075-1:2017 is used for:

Leather manufacturers and finishers for in‑house quality control.
Independent testing laboratories performing compositional analysis.
Product compliance and safety teams assessing chromium(VI) content in leather goods.
Material scientists and R&D evaluating tanning processes and mitigation measures. Practical uses include batch release testing, supplier verification, and investigation of colored/leather treated materials where a colorimetric approach is suitable.

Related standards

ISO 17075-2 - Ionic chromatography method (reference method; fewer color interferences).
ISO 2418 - Sampling location for leather testing.
ISO 4044:2017 - Preparation of chemical test samples.
ISO 3696 - Water for analytical use.

Keywords: ISO 17075-1:2017, chromium(VI) in leather, colorimetric method, leather testing, solid phase extraction, diphenylcarbazide, photometric detection, pH 7–8, limit of quantification 3 mg/kg.

ISO 17075-1:2017 PDF

Технические детали

Abstract

Overview

Key topics and requirements

Applications and users

Related standards

Похожие стандарты

Abstract

Overview

Key topics and requirements

Applications and users

Related standards

Похожие стандарты

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