SN/T 5242-2020 in English

VALID

Textiles for import and export Determination of germanium-Inductively coupled plasma mass spectrometry method

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

Price(USD)： $130.00
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Standard No:	SN/T 5242-2020
Document status:	VALID
Title in English:	Textiles for import and export Determination of germanium-Inductively coupled plasma mass spectrometry method
Title in Chinese:	进出口纺织品锗含量的测定电感耦合等离子体质谱法
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
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Introduction

Analysis of the core content of the standard

This standard uses inductively coupled plasma mass spectrometer as the core detection equipment, and uses microwave digestion pre-treatment technology to achieve trace detection of germanium in textiles. The method's lower limit of determination is 0.020 mg/kg, which meets the internationally accepted textile safety supervision requirements.

Comparison of key technologies

Technical elements	This standard method	Conventional AAS method	Advantages
Detection limit	0.020 mg/kg	0.50 mg/kg	Sensitivity increased by 25 times
Analysis time	Single sample＜5min	＞15min	Efficiency increased by 3 times
Anti-interference ability	Mass number resolution	Spectral interference	Eliminate matrix effects

Key points for standard implementation

Quality control case

When a laboratory used Bruker M90 ICP-MS to detect polyester samples, the signal intensity of 72Ge was increased by 40% by optimizing the nebulizer gas flow rate (0.90 L/min) and sampling depth (7.0 mm), and the RSD was controlled at <5%.

Digestion program optimization

The microwave digestion program recommended by the standard adopts a segmented heating strategy: 200℃ for 25 minutes, which not only ensures the complete decomposition of organic matter, but also avoids the loss of germanium volatilization. In actual application, the ratio of nitric acid (5mL) and hydrogen peroxide (3mL) needs to be adjusted according to the sample material.

Technology Evolution Analysis

Compared with the traditional method, this standard has three breakthroughs: 1) Introducing the 115In internal standard calibration system; 2) Using the nickel sampling cone to improve ion transmission efficiency; 3) Standardizing the 0.45μm aqueous membrane filtration process. These improvements stabilize the method recovery rate between 85-113%.

Implementation Recommendations

Laboratories should regularly calibrate the injection efficiency of the nebulizer
Different fabric types need to verify the completeness of digestion (cotton fabrics are recommended to increase the pre-digestion time)
Standard solutions should be stored strictly under the conditions of 0-5℃/1 month

More samples: QC/T 942-2021 JJG 21-2008 GB 50021-2001(2009)

Sample only — not a preview of SN/T 5242-2020

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