SN/T 4678-2016 in English

VALID

Determination of uranium and thorium in food for export一Inductively coupled plasma mass spectrometry method

Issued on:2016-12-12
Implemented on:2017-07-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $160.00
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Standard No:	SN/T 4678-2016
Document status:	VALID
Title in English:	Determination of uranium and thorium in food for export一Inductively coupled plasma mass spectrometry method
Title in Chinese:	出口食品中铀、钍的测定方法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:	2016-12-12
Implemented on:	2017-07-01
Professional Classification:	SN-Import&Export Inspection
Related Keywords:	plasma mass spectrometry method introduction analysis plasma mass spectrometry thorium recoveries uranium recoveries immediate use method validation data validation
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Introduction

Analysis of the core content of the standard

This standard uses inductively coupled plasma mass spectrometry to determine the content of uranium (238U) and thorium (232Th) in food. The detection limit of the method is 0.025mg/kg, covering major food categories such as grains, fruits and vegetables, meat, fish, shrimp and dairy products.

Key Technical Points

Key Links	Technical Parameters	Quality Control
Sample Pretreatment	Sealed Microwave Digestion (120→160→195℃ Gradient Temperature Ramp)	The digestion solution must be clear and transparent
Instrumental Analysis	RF power 1300W, nebulizer gas 0.975L/min	Bismuth (209Bi) as internal standard
Calibration Curve	6-point calibration (0.5-15μg/L)	Prepared for immediate use

Method Validation Data

Validation across seven matrices showed uranium recoveries of 86.2%-120.0% and thorium recoveries of 80.6%-121.1%. The higher uranium recovery in the milk powder matrix may be due to organic interference; increasing the digestion time is recommended.

Recommendations for Standard Implementation

Collision cell parameters for different brands of ICP-MS need to be optimized to eliminate polyatomic interferences
It is recommended to add a pre-digestion step for high-fat samples
Matrix-matched standards should be included in each batch of testing

Analysis of Technological Evolution

Compared to traditional α-spectroscopy, ICP-MS reduces analysis time from 7 days to 2 hours, increasing throughput by 20-fold. The 2016 version of the standard added a bismuth internal standard system, significantly improving long-term stability (RSD <5%).

More samples: NB/T 47013.2-2015 JC/T 2453-2018 GB 50021-2001(2009)

Sample only — not a preview of SN/T 4678-2016

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