SIST EN ISO 23649:2025 PDF

Chemicals for the leather tanning industry - Determination of cyclosiloxanes in waterproofing fatliquors (ISO 23649:2025)

Название (английский):

SIST EN ISO 23649:2025

Chemicals for the leather tanning industry - Determination of cyclosiloxanes in waterproofing fatliquors (ISO 23649:2025)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 17
Дата публикации:: 12 марта 2025 г.
Издание:: ISO 23649:2025
ICS:: 59.140.30

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Описание (английский):

This document specifies a method for determining the total content of the following cyclosiloxanes in chemicals for the leather tanning industry: — octamethylcyclotetrasiloxane (D4); — decamethylcyclopentasiloxane (D5); — dodecamethylcyclohexasiloxane (D6); This method requires the use of gas chromatography (GC) equipped with a single quadrupole mass spectrometer (MS) to identify and quantify the cyclosiloxanes.

Технические детали

Технический комитет: IUSN - Leather
SKU: SIST EN ISO 23649:2025

Abstract

Overview

EN ISO 23649:2025 - Chemicals for the leather tanning industry: Determination of cyclosiloxanes (ISO 23649:2025) specifies a standardized analytical method for measuring the total content of three cyclosiloxanes - octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5) and dodecamethylcyclohexasiloxane (D6) - in chemicals used in leather tanning (for example, silicone-based waterproofing fatliquors and finishing agents). The method uses gas chromatography with a single quadrupole mass spectrometer (GC‑MS) following sample solubilisation and liquid–liquid extraction.

Key topics and requirements

Analytes: D4, D5, D6 (cyclosiloxanes) - all noted in the document as classified in the EU as persistent, bioaccumulative and toxic (PBT).
Analytical technique: Gas chromatography (GC) coupled with a single quadrupole mass spectrometer (MS) for identification and quantification.
Sample preparation:
- Solubilise the chemical specimen in water (water grade 1, ISO 3696).
- Perform liquid–liquid extraction using an n‑hexane : ethyl acetate (50:50 v/v) mixture.
- Use internal standardisation to compensate for matrix effects and recovery.
- Annex C covers sample preparation for non‑water‑soluble chemicals.
Calibration and quantification:
- External calibration with correction for the internal standard recovery.
- Stock solutions and internal standards (examples: Naphthalene‑D8 or Tetrakis(trimethylsilyloxy)silane) are specified.
Apparatus and reagents: Ultrasonic bath, shaker, centrifuge, syringe membrane filters (e.g., 0.2 µm), GC vials, analytical balance, n‑hexane, ethyl acetate, sodium chloride, anhydrous MgSO4, and certified reference cyclosiloxanes.
Supporting information:
- Annex A: recommended chromatographic operating parameters for GC‑MS.
- Annex B: method precision / reliability data.
- Annex C: normative sample prep for non‑water‑soluble matrices.

Applications and users

Overview

Key topics and requirements

Analytes: D4, D5, D6 (cyclosiloxanes) - all noted in the document as classified in the EU as persistent, bioaccumulative and toxic (PBT).
Analytical technique: Gas chromatography (GC) coupled with a single quadrupole mass spectrometer (MS) for identification and quantification.
Sample preparation:
- Solubilise the chemical specimen in water (water grade 1, ISO 3696).
- Perform liquid–liquid extraction using an n‑hexane : ethyl acetate (50:50 v/v) mixture.
- Use internal standardisation to compensate for matrix effects and recovery.
- Annex C covers sample preparation for non‑water‑soluble chemicals.
Calibration and quantification:
- External calibration with correction for the internal standard recovery.
- Stock solutions and internal standards (examples: Naphthalene‑D8 or Tetrakis(trimethylsilyloxy)silane) are specified.
Apparatus and reagents: Ultrasonic bath, shaker, centrifuge, syringe membrane filters (e.g., 0.2 µm), GC vials, analytical balance, n‑hexane, ethyl acetate, sodium chloride, anhydrous MgSO4, and certified reference cyclosiloxanes.
Supporting information:
- Annex A: recommended chromatographic operating parameters for GC‑MS.
- Annex B: method precision / reliability data.
- Annex C: normative sample prep for non‑water‑soluble matrices.

SIST EN ISO 23649:2025 PDF

Технические детали

Abstract

Overview

Key topics and requirements

Applications and users

Abstract

Overview

Key topics and requirements

Applications and users

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