GB/T 14352.21-2021 English PDF

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GB/T 14352.21-2021: Methods for chemical analysis of tungsten ores and molybdenum ores - Part 21: Determination of arsenic content - Hydride generation atomic fluorescence spectrometry
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 14352.21-2021	169	Add to Cart	3 days	Methods for chemical analysis of tungsten ores and molybdenum ores - Part 21: Determination of arsenic content - Hydride generation atomic fluorescence spectrometry	Valid

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SN/T 2763.6   GB/T 14353.18   SN/T 3365   GB/T 14352.24   GB/T 14352.20   GB/T 14352.22   

Basic data

Standard ID: GB/T 14352.21-2021 (GB/T14352.21-2021)
Description (Translated English): Methods for chemical analysis of tungsten ores and molybdenum ores - Part 21: Determination of arsenic content - Hydride generation atomic fluorescence spectrometry
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D40
Word Count Estimation: 9,996
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 14352.21-2021: Methods for chemical analysis of tungsten ores and molybdenum ores - Part 21: Determination of arsenic content - Hydride generation atomic fluorescence spectrometry

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Methods for chemical analysis of tungsten ores and molybdenum ores - Part 21.Determination of arsenic content - Hydride generation atomic fluorescence spectrometry ICS 73.060 D40 National Standards of People's Republic of China Chemical analysis methods of tungsten ore and molybdenum ore Part 21.Determination of Arsenic Hydride Generation-Atomic Fluorescence Spectrometry Released on 2021-03-09 2021-10-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Table of contents

Foreword Ⅰ 1 Scope 1 2 Normative references 1 3 Principle 1 4 Reagent 1 5 Apparatus and equipment 2 6 Sample 2 7 Analysis step 2 7.1 Sample size 2 7.2 Blank test 2 7.3 Verification test 2 7.4 Decomposition of the sample 2 7.5 Preparation of calibration solution series 3 7.6 Determination 3 7.7 Drawing the calibration curve 3 8 Result calculation 3 9 Precision and accuracy 3 10 Quality Assurance and Control 4 Appendix A (informative appendix) Instrument reference working conditions and related instructions 5 Appendix B (informative appendix) Precision and accuracy summary table 6

Foreword

GB/T 14352 "Methods for Chemical Analysis of Tungsten Ore and Molybdenum Ore" has 22 parts, including 25 chemical analyses of 34 elements method. ---Part 1.Determination of tungsten content; ---Part 2.Determination of the amount of molybdenum; ---Part 3.Determination of copper content; ---Part 4.Determination of lead content; ---Part 5.Determination of zinc content; ---Part 6.Determination of cadmium content; ---Part 7.Determination of the amount of cobalt; ---Part 8.Determination of nickel content; ---Part 9.Determination of Sulfur Content; ---Part 10.Determination of arsenic content; ---Part 11.Determination of the amount of bismuth; ---Part 12.Determination of silver content; ---Part 13.Determination of tin content; ---Part 14.Determination of Gallium Content; ---Part 15.Determination of Germanium Content; ---Part 16.Determination of selenium content; ---Part 17.Determination of the amount of tellurium; ---Part 18.Determination of rhenium content; ---Part 19.Determination of bismuth, cadmium, cobalt, copper, iron, lithium, nickel, phosphorus, lead, strontium, vanadium and zinc content inductively coupled plasma atomic emission Spectroscopy; ---Part 20.Determination of niobium, tantalum, zirconium, hafnium and 15 rare earth elements by inductively coupled plasma mass spectrometry; ---Part 21.Determination of Arsenic Content Hydride Generation-Atomic Fluorescence Spectrometry; ---Part 22.Determination of the amount of antimony hydride generation-atomic fluorescence spectrometry. This part is Part 21 of GB/T 14352. This section was drafted in accordance with the rules given in GB/T 1.1-2009. This part was proposed by the Ministry of Natural Resources of the People's Republic of China. This part is under the jurisdiction of the National Standardization Technical Committee for Natural Resources and Land and Space Planning (SAC/TC93). Drafting units of this section. Jiangsu Geological Survey Research Institute, China Natural Resource Economics Research Institute. The main drafters of this section. Cai Yuman, Li Ming, Shen Wenjin, Lu Lijun, Chen Zhibing, Yang Cheng, Huang Guangming, Zhang Peixin, Chang Qing, Gao Xiangyun. Chemical analysis methods of tungsten ore and molybdenum ore Part 21.Determination of Arsenic Hydride Generation-Atomic Fluorescence Spectrometry

1 Scope

This part of GB/T 14352 specifies the determination of arsenic content in tungsten ores and molybdenum ores by hydride generation-atomic fluorescence spectrometry. This section applies to the determination of arsenic content in tungsten ores and molybdenum ores by hydride generation-atomic fluorescence spectrometry. The detection limit of arsenic in this method is 0.18μg/g. The determination range of arsenic in this method is 0.2μg/g~2000μg/g.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 6682 Analytical laboratory water specifications and test methods GB/T 14505 General rules and general regulations of rock and ore chemical analysis methods

3 Principle

The sample was decomposed by hydrochloric acid and nitric acid to prepare a sample solution. The pentavalent arsenic in the solution is reduced to trivalent arsenic by the thiourea-ascorbic acid solution. three The valence arsenic ion reacts with potassium borohydride to generate arsine hydrogen, which is introduced into the atomizer by carrier gas (argon), and is illuminated by the high-intensity hollow cathode lamp of arsenic. The generated ground state arsenic atom is excited to a high energy state, and when it is deactivated back to the ground state, it emits fluorescence with a characteristic wavelength, and its fluorescence intensity is the same as that in the sample. The content of arsenic is directly proportional, and the amount of arsenic in the solution is quantitatively determined by the calibration curve method.

4 Reagents

Unless otherwise specified, analytically pure chemical reagents that meet national standards are used in the analysis, and the pure water used is in compliance with GB/T 6682 regulations. Set secondary water. 4.1 Hydrochloric acid [ρ(HCl)=1.19g/mL]. 4.2 Nitric acid [ρ(HNO3)=1.42g/mL]. 4.3 Hydrochloric acid solution (11). 4.4 Citric acid-potassium iodide solution. Weigh 20g of citric acid, 5g of potassium iodide and dissolve in water, dilute to 100mL with water, and shake well. 4.5 Thiourea-ascorbic acid solution (ρ=100g/L). Weigh 10g thiourea and 10g ascorbic acid, dissolve in water and dilute to 100mL. 4.6 Potassium borohydride solution (ρ=20g/L). Weigh 20g of potassium borohydride and dissolve it in 1000mL of water to which 2g of sodium hydroxide has been added. 4.7 Hydrochloric acid solution (1 9). 4.8 Arsenic standard solution. a) Arsenic standard stock solution [ρ(As)=100.0μg/mL] Weigh 0.1320g spectral pure arsenic trioxide, place it in a 100mL beaker, add 10mL sodium hydroxide solution (100g/L) ......

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