SN/T 5350.2-2021 in English

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Determination of arsenic in sulfur - Atomic fluorescence spectrometer method

Issued on:2021-11-22
Implemented on:2022-06-01
File Format:PDF
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Price(USD)： $150.00
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Standard No:	SN/T 5350.2-2021
Document status:	VALID
Title in English:	Determination of arsenic in sulfur - Atomic fluorescence spectrometer method
Title in Chinese:	硫磺砷含量的测定原子荧光光谱法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2021-11-22
Implemented on:	2022-06-01
Professional Classification:	SN-Import&Export Inspection
Related Keywords:	atomic fluorescence spectrometer method introduction technical background atomic arsenic potassium borohydride solution atomic fluorescence spectrometer automatic potentiometric titration method method validation data concentration range
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Introduction

Technical Background of the Standard

This standard, as the second part of the SN/T5350 series, complements the automatic potentiometric titration method in the first part and together builds a complete technical system for sulfur quality testing. The standard was formulated based on the standardization requirements of GB/T1.1-2009 and was compiled by technical experts from Urumqi and Ningbo Customs, led by the General Administration of Customs.

Detailed explanation of the method principle

Steps	Chemical reaction	Key parameters
Microwave digestion	Sulfur→Sulfate	Nitric acid+hydrogen peroxide system
Valence state reduction	As(V)→As(III)	Thiourea-ascorbic acid mixture
Hydride generation	As(III)→AsH₃	20g/L potassium borohydride solution

Atomic fluorescence spectrometer detects the fluorescence intensity of atomic arsenic at a characteristic wavelength of 228.8nm through excitation by a special arsenic hollow cathode lamp. Its linear correlation coefficient is required to be ≥0.995 (according to JJG939).

Key operating points

Sample pretreatment: The digestion procedure needs to be strictly controlled. It is recommended to use a step-by-step heating mode (120℃→180℃→220℃)
Interference elimination: Nitrogen oxides must be removed, and the hot plate is heated at 100℃ for 1 hour
Solution preparation: The thiourea-ascorbic acid mixture must be prepared and used immediately, and the validity period shall not exceed 4 hours

Implementation suggestions

The laboratory should focus on the calibration and maintenance of the microwave digestion instrument. It is recommended to perform the following every quarter:

Pressure sensor calibration
Digestion vessel sealing test
Temperature uniformity verification

For high-content samples (＞100 mg/kg), it is recommended to use the secondary dilution method to reduce the matrix effect.

Method Validation Data

Concentration Range (mg/kg)	Repeatability Limit (r)	Reproducibility Limit (R)
0.5-10	0.016-0.311	0.097-0.361
10-100	0.311-3.11	0.361-3.66
100-250	3.11-7.78	3.66-9.01

More samples: QC/T 942-2021 JGJ 94-2008 YD/T 3934-2021

Sample only — not a preview of SN/T 5350.2-2021

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