ISO 27587:2021 PDF

Leather — Chemical tests — Determination of free formaldehyde in process auxiliaries

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Title (English):

ISO 27587:2021

Leather — Chemical tests — Determination of free formaldehyde in process auxiliaries

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 8
Publication date:: February 19, 2021
Edition:: ISO IS 27587 edition 2 version 1
ICS:: 59.140.30

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Description (English):

This document specifies a method for the determination of free formaldehyde, which is released under dynamic conditions when the sample is heated in an inert dry atmosphere, in process auxiliaries for leather. The analytical result obtained according to this procedure is expressed in milligrams per kilogram (mg/kg) sample.

Technical details

Technical committee: IULTCS - International Union of Leather Technologists and Chemists Societies
SKU: ISO 27587:2021

Abstract

Overview

ISO 27587:2021 - Leather - Chemical tests - Determination of free formaldehyde in process auxiliaries specifies a quantitative analytical method to measure free formaldehyde released from leather process auxiliaries when heated under dynamic, inert conditions. The procedure captures released formaldehyde on 2,4‑dinitrophenylhydrazine (DNPH) cartridges, elutes the derivative with acetonitrile, and quantifies it by HPLC with UV or DAD detection. Results are reported in milligrams per kilogram (mg/kg) of sample.

Key topics and technical requirements

Principle: Thermal release of formaldehyde in an inert, dry atmosphere; trapping with DNPH; HPLC analysis of DNPH‑derivative.
Sample preparation: Typical sample mass 0.1–2.0 g (adjust for liquids); heat in a U‑tube immersed to a defined level in an oil bath at (90 ± 3) °C for 30 min.
Inert atmosphere: Nitrogen purge; initial purge recommended at 500 ml/min (15 min), analysis flow adjusted between 150–350 ml/min.
Trapping media: DNPH cartridges sized for carbonyl capacity (example capacity 6 400 µg); recommended cartridge excess capacity ≥20% of predicted formaldehyde.
Elution and analysis: Elute cartridges with HPLC‑grade acetonitrile, filter (e.g., 0.45 µm), and analyse by RP‑C18 HPLC using UV/DAD. Annex B provides suggested HPLC conditions.
Calibration and quantitation: External standard calibration using derivatized formaldehyde‑DNPH in the range 0.5 µg/10 ml to 100 µg/10 ml. Calculation converts calibration result to mg/kg sample.
Quality control: Blank checks for reagent and system background (blank must be

Related standards

Other ISO standards

Overview

Key topics and technical requirements

Principle: Thermal release of formaldehyde in an inert, dry atmosphere; trapping with DNPH; HPLC analysis of DNPH‑derivative.
Sample preparation: Typical sample mass 0.1–2.0 g (adjust for liquids); heat in a U‑tube immersed to a defined level in an oil bath at (90 ± 3) °C for 30 min.
Inert atmosphere: Nitrogen purge; initial purge recommended at 500 ml/min (15 min), analysis flow adjusted between 150–350 ml/min.
Trapping media: DNPH cartridges sized for carbonyl capacity (example capacity 6 400 µg); recommended cartridge excess capacity ≥20% of predicted formaldehyde.
Elution and analysis: Elute cartridges with HPLC‑grade acetonitrile, filter (e.g., 0.45 µm), and analyse by RP‑C18 HPLC using UV/DAD. Annex B provides suggested HPLC conditions.
Calibration and quantitation: External standard calibration using derivatized formaldehyde‑DNPH in the range 0.5 µg/10 ml to 100 µg/10 ml. Calculation converts calibration result to mg/kg sample.
Quality control: Blank checks for reagent and system background (blank must be

ISO 27587:2021 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

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Abstract

Overview

Key topics and technical requirements

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