GB/T 6730.77-2019 in English

VALID

Iron ores—Determination of arsenic content—Hydride generation-atomic fluorescence spectrometric method

Issued on:2019-08-30
Implemented on:2020-07-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $220.00
$214.00

Standard No:	GB/T 6730.77-2019
Document status:	VALID
Title in English:	Iron ores—Determination of arsenic content—Hydride generation-atomic fluorescence spectrometric method
Title in Chinese:	铁矿石砷含量的测定氢化物发生-原子荧光光谱法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2019-08-30
Implemented on:	2020-07-01
ICS Classification:	73.060.10-Iron ores
Chinese Classification:	D31-Iron ore
Professional Classification:	GB-National Standard
Related Keywords:	arsenic content hydride hydride generation-atomic fluorescence spectrometry arsenic content hydride generation-atomic fluorescence spectrometer arsenic content range
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《GB/T 6730.77-2019铁矿石　砷含量的测定　氢化物发生-原子荧光光谱法》由TC317（全国铁矿石与直接还原铁标准化技术委员会）归口，主管部门为中国钢铁工业协会。

Introduction

GB/T 6730.77-2019 specifies in detail the method for determining the arsenic content in iron ore using hydride generation-atomic fluorescence spectrometry, which is applicable to natural iron ore, iron concentrate and lump ore, including sintered products. The method reduces pentavalent arsenic to trivalent arsenic by chemical reaction in hydrochloric acid medium and detects it on an atomic fluorescence spectrometer.

Overview of standard content

Scope of application

Determination range: 0.001% to 0.50%
Applicable to iron ore and its products, including sintered products

Reagents and materials

A variety of reagents are used in the analysis, including hydrochloric acid, nitric acid, hydrofluoric acid, etc. Key reagents such as thiourea-ascorbic acid mixed solution are used for pre-reduction of the test solution, and potassium borohydride solution is used as a reducing agent.

Instruments and Equipment

The main instrument is a hydride generation-atomic fluorescence spectrometer (in accordance with GB/T 21191), equipped with an arsenic hollow cathode lamp, and the detection limit is not less than 0.07μg/L.

Analysis Steps

Sample Decomposition

Method	Detailed Steps	Applicable Situations
Microwave Digestion Method	The sample is digested in a polytetrafluoroethylene digestion tank by adding hydrochloric acid, nitric acid, etc. in sequence.	Applicable to conventional samples
Conventional Acid Dissolution Method	The sample is heated and digested in a polytetrafluoroethylene beaker using a variety of strong acids.	For samples with high silicon content

Test solution aliquoting and calibration

Different volumes of test solution were aliquoted according to the arsenic content range (Table 1) and the fluorescence intensity was measured after dilution.

Table 1: Comparison of sample quantity and aliquot volume

Result calculation and quality control

Precision analysis

Arsenic content range (%)	Repeatability limit r	Reproducibility limit R
0.001-0.50%	r=0.0532X+0.00028	R=0.120X+0.00160

Result presentation and report

Analysis results according to GB/T 8170 was rounded off, retaining four decimal places when less than 0.1%, and retaining three decimal places when greater than or equal to 0.1%.

Implementation suggestions

Method advantages

High sensitivity: detection limit of 0.07μg/L
Good accuracy: linear correlation coefficient of standard curve ≥0.996
Strong applicability: applicable to a variety of iron ore samples

Precautions

Pay attention to the protection of strong acid solution during the experiment. Blank test and standard sample verification are important steps to ensure data reliability.

Future improvement direction

Explore the application of automated digestion technology
Optimize reagent ratio to improve determination efficiency

More samples: JC/T 2453-2018 QC/T 942-2021 GB 50021-2001(2009)

Sample only — not a preview of GB/T 6730.77-2019

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