SH/T 1831-2020 in English

VALID

Determination of free acrylonitrile content in acrylonitrile-butadiene rubber-Headspace gas chromatography

Issued on:2020-12-09
Implemented on:2021-04-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $180.00
$175.00

Standard No:	SH/T 1831-2020
Document status:	VALID
Title in English:	Determination of free acrylonitrile content in acrylonitrile-butadiene rubber-Headspace gas chromatography
Title in Chinese:	丙烯腈-丁二烯橡胶中游离丙烯腈含量的测定顶空气相色谱法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-12-09
Implemented on:	2021-04-01
Professional Classification:	SH-Petrochemical
Related Keywords:	acrylonitrile-butadiene rubber-headspace gas chromatography introduction technical background gas chromatography system free acrylonitrile content headspace gas chromatography free acrylonitrile
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Introduction

Technical Background of the Standard

This standard was first published in 2020, filling the gap in the detection method of free acrylonitrile in acrylonitrile-butadiene rubber (NBR) in my country. As a toxic residual monomer, the content of free acrylonitrile directly affects the safety and environmental performance of rubber products.

Core principle of the method

Detection was achieved by using headspace gas chromatography (HS-GC) technology through the following steps:

Steps	Technical parameters	Function
Sample pretreatment	Particle size ≤3mm, 0.3g±0.1mg	Ensure sample representativeness
Solvent system	Tetralin solution containing BHT (200mg/L)	Inhibit oxidation reaction
Equilibrium conditions	Constant temperature oscillation at 100℃ for 150min	Gas-liquid distribution balance

Key instrument configuration

The standard requires the use of a gas chromatography system equipped with a flame ionization detector (FID), and the chromatographic column must meet the following requirements:

Specifications:50m×0.32mm×0.33μm
Stationary phase:Nitroterephthalic acid-modified polyethylene glycol
Detection limit:1.8mg/kg

Method validation data

According to the inter-laboratory comparison results in Appendix A:

Sample	Average value (mg/kg)	Repeatability (r)	Reproducibility (R)
NBR-1	16.41	2.13	3.49
NBR-2	59.45	1.61	6.29

Industry Application Suggestions

In rubber product manufacturers, it is recommended that:

Establish a standard solution gradient (0.2-20mg/L) to cover samples with different contents
Perform regular chromatographic column aging (180℃≥1h)
For high-content samples (>20mg/kg), it is recommended to dilute and retest

Technology Development Outlook

Future improvements may be in the following directions:

Use mass spectrometry (MS) to improve qualitative capabilities
Develop fast equilibration technology to shorten the equilibration time by 150min
Establish international comparison with ISO standards

More samples: NB/T 47013.2-2015 JJG 21-2008 DL/T 5154-2012

Sample only — not a preview of SH/T 1831-2020

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