ISO 19071:2016 PDF

Leather — Chemical tests — Determination of chromium (VI) and the reductive potential for chromium tanning agents

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Название (английский):

ISO 19071:2016

Leather — Chemical tests — Determination of chromium (VI) and the reductive potential for chromium tanning agents

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 25 февраля 2016 г.
Издание:: ISO IS 19071 edition 1 version 1
ICS:: 59.140.30

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Срок поставки:1 раб. дн. (перевод)

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Описание (английский):

ISO 19071:2016 specifies a test method for the determination of chromium (VI) content in chromium tanning agents. The results give information about the reductive potential of the chromium tanning agent.

Технические детали

Технический комитет: IULTCS - International Union of Leather Technologists and Chemists Societies
SKU: ISO 19071:2016

Abstract

Overview

ISO 19071:2016 - Leather - Chemical tests - Determination of chromium (VI) and the reductive potential for chromium tanning agents - specifies a validated laboratory method to determine chromium (VI) content in chromium tanning agents and to quantify the agent’s reductive potential. The standard is intended for analytical laboratories, leather manufacturers, chemical suppliers and regulatory compliance testing (e.g., REACH).

Key topics and technical requirements

Scope and purpose: Measurement of Cr(VI) in chromium tanning agents and assessment of reductive potential that can reduce Cr(VI) recovery.
Principle: Dissolve the tanning agent in water, react Cr(VI) with 1,5-diphenylcarbazide to form a coloured complex, extract the complex into n‑hexanol, and determine absorbance by photometry at 540 nm.
Standard addition procedure: Because many tanning agents contain reducing substances, ISO 19071 requires the standard addition method - repeating the test with incremental added Cr(VI) to determine true Cr(VI) and the reductive potential.
Reagents and apparatus: Analytical-grade reagents including diphenylcarbazide, n‑hexanol, phosphoric acid; equipment such as separation funnel, horizontal shaker (≈250 r/min), spectrophotometer (540 nm) and photometric cell (20 mm typical).
Sampling and sample prep: Homogenize samples; solids powdered if necessary; prepare analytical solution and analyze immediately.
Quality control and calibration: Daily recovery check (control sample 15 µg Cr(VI)) and calibration curve (5–35 µg Cr(VI) levels) are required.
Calculation and reporting: Use linear regression of absorbance vs. added Cr(VI)/sample amount. If calculated Cr(VI) is positive, report the content in mg/kg to 0.1 mg/kg. If negative (common), report Cr(VI) as “less than 3 mg/kg (

Overview

Key topics and technical requirements

Scope and purpose: Measurement of Cr(VI) in chromium tanning agents and assessment of reductive potential that can reduce Cr(VI) recovery.
Principle: Dissolve the tanning agent in water, react Cr(VI) with 1,5-diphenylcarbazide to form a coloured complex, extract the complex into n‑hexanol, and determine absorbance by photometry at 540 nm.
Standard addition procedure: Because many tanning agents contain reducing substances, ISO 19071 requires the standard addition method - repeating the test with incremental added Cr(VI) to determine true Cr(VI) and the reductive potential.
Reagents and apparatus: Analytical-grade reagents including diphenylcarbazide, n‑hexanol, phosphoric acid; equipment such as separation funnel, horizontal shaker (≈250 r/min), spectrophotometer (540 nm) and photometric cell (20 mm typical).
Sampling and sample prep: Homogenize samples; solids powdered if necessary; prepare analytical solution and analyze immediately.
Quality control and calibration: Daily recovery check (control sample 15 µg Cr(VI)) and calibration curve (5–35 µg Cr(VI) levels) are required.
Calculation and reporting: Use linear regression of absorbance vs. added Cr(VI)/sample amount. If calculated Cr(VI) is positive, report the content in mg/kg to 0.1 mg/kg. If negative (common), report Cr(VI) as “less than 3 mg/kg (

ISO 19071:2016 PDF

Технические детали

Abstract

Overview

Key topics and technical requirements

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Abstract

Overview

Key topics and technical requirements

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