SN/T 5258-2020 in English

VALID

Determination of ultraviolet absorbers UV-320and UV-328 in coatings-High performance liquid chromatography

Issued on:2020-08-27
Implemented on:2021-03-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $180.00
$175.00

Standard No:	SN/T 5258-2020
Document status:	VALID
Title in English:	Determination of ultraviolet absorbers UV-320and UV-328 in coatings-High performance liquid chromatography
Title in Chinese:	涂料中UV-320和UV-328紫外线吸收剂的测定高效液相色谱法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-08-27
Implemented on:	2021-03-01
Professional Classification:	SN-Import&Export Inspection
Related Keywords:	high performance liquid chromatography coatings-high performance liquid chromatography introduction analysis ultraviolet absorbers benzotriazole ultraviolet absorbers uv-328 content
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Introduction

Analysis of the core content of the standard

This standard establishes for the first time a method system for the determination of two benzotriazole ultraviolet absorbers in coatings by high performance liquid chromatography. The technical points include:

Technical Parameters	UV-320	UV-328
CAS No.	3846-71-7	25973-55-1
Detection Wavelength	340nm
Detection Limit	25mg/kg

Method principle and technological innovation

Adopting gradient elution technology (acetonitrile/water system), by optimizing the extraction solvent:

Solvent-based coatings: n-hexane ultrasonic extraction
Water-based coatings: tetrahydrofuran-n-hexane (1:1) mixed extraction

Actual application case

A certain coatings export company found that the UV-328 content reached 1,200mg/kg according to this standard. By adjusting the formula, the concentration was successfully controlled within the limit of EU REACH regulations.

Key operating points

The sample preparation needs to be leveled into a uniform film and completely dried
The extraction temperature is strictly controlled at 35±1℃
The chromatographic column should be C18 reverse phase column (250mm×4.6mm, 5μm)

Standard implementation suggestions

Steps	Precautions
Preparation of standard solution	Store in dark at 0-4℃ and prepare before use
Method validation	Two levels of spike recovery tests are required, 200mg/kg and 1000mg/kg
Quality Control	Each batch of samples should be accompanied by blank and quality control samples

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

Sample only — not a preview of SN/T 5258-2020

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