GB/T 6730.48-2021 English PDF

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GB/T 6730.48-2021: Iron ores - Determination of bismuth content - Dethiodiantipyryl methane spectrophotometric method
Status: Valid

GB/T 6730.48: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 6730.48-2021	249	Add to Cart	3 days	Iron ores - Determination of bismuth content - Dethiodiantipyryl methane spectrophotometric method	Valid
GB/T 6730.48-1986	239	Add to Cart	2 days	Methods for chemical analysis of iron ores. The dethio diantipyryl methane photometric method for the determination of bismuth content	Obsolete

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Basic data

Standard ID: GB/T 6730.48-2021 (GB/T6730.48-2021)
Description (Translated English): Iron ores - Determination of bismuth content - Dethiodiantipyryl methane spectrophotometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D31
Word Count Estimation: 12,135
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 6730.48-2021: Iron ores - Determination of bismuth content - Dethiodiantipyryl methane spectrophotometric method

---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.
Iron ores -- Determination of bismuth content -- Dithiodiantipyryl methane spectrophotometric method ICS 73:060:10 CCSD31 National Standards of People's Republic of China Replacing GB/T 6730:48-1986 Determination of Bismuth in Iron Ore Dithiodiantipyridinemethane Spectrophotometry Published on 2021-12-31 2022-07-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration

foreword

This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted: This document is Part 48 of GB/T 6730: See Appendix A for the published part of GB/T 6730: This document replaces GB/T 6730:48-1986 "Methods for Chemical Analysis of Iron Ore Dithiodiantipyridine Methane Spectrophotometric Determination of Bismuth Compared with GB/T 6730:48-1986, except for structural adjustment and editorial changes, the main technical changes are as follows: a) Added the chapter "Normative References" (see Chapter 2); b) Changed the sample decomposition method (see 8:4:1 and 8:4:2, 4:5:1 and 4:5:2 of the 1986 edition); c) Changed the color development acidity control method (see 8:4:4:1, 4:5:4:1 of the 1986 edition); d) the selection of the reference in the measurement has been changed (see 8:4:4:1 and 8:4:4:2, 4:5:4:1 and 4:5:4:2 of the 1986 edition); e) The calculation of the analysis results has been changed (see Chapter 9, Chapter 5 of the 1986 edition): Please note that some content of this document may be patented: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed by China Iron and Steel Association: This document is under the jurisdiction of the National Standardization Technical Committee for Iron Ore and Direct Reduced Iron (SAC/TC317): This document is drafted by: Wuhan Iron and Steel Co:, Ltd:, Hebei Provincial Institute of Product Quality Supervision and Inspection: The main drafters of this document: Zhou Zheng, Yu Lujun, Zhang Ning, Yu Weihua, Zhou Honglin, Zhang Suizhong, Liu Jiantao, Li Jie, Zheng Feng, Yang Yan, Wen Bin: This document was first published in 1986 and this is the first revision:

Introduction

Iron ore is the main raw material of the iron and steel industry: In the standard system of the iron and steel field, the standard system for the determination of chemical composition of iron ore is the It plays an important role in ensuring the quality of iron ore products: This series of method standards serves the production of iron ore production, trade and application, and provide technical support for the high-quality development of my country's iron and steel industry: GB/T 6730 is a series of standards for the determination of chemical composition of iron ore, which respectively stipulates moisture, total iron, metallic iron, Ferrous, silicon, aluminum, calcium, magnesium, sulfur, phosphorus, manganese, titanium, total rare earth, barium, chromium, vanadium, tin, copper, cobalt, nickel, zinc, niobium, bismuth, potassium, sodium, carbon, lead , arsenic, cadmium, Methods for the determination of chemical components such as mercury, fluorine, chlorine, loss on ignition, and combined water: In 1986, GB/T 6730 issued 51 national standards for the determination of chemical composition of iron ore for the first time: According to the development of technology and the actual needs of production, after years of continuous formulation and revision work, a relatively complete standard system has been formed at present: The GB/T 6730 constituent documents are detailed in Appendix A: GB/T 6730:48 describes the spectrophotometric method for the determination of bismuth content in iron ore by dithiodiantipyridine methane: After this revision Consistent with international standards: Determination of Bismuth in Iron Ore Dithiodiantipyridinemethane Spectrophotometry Caution - Persons using this document should have practical experience in formal laboratory work: This document does not address all possible security issues question: It is the user's responsibility to take appropriate safety and health measures and to ensure compliance with the conditions stipulated by relevant national regulations:

1 Scope

This document specifies a method for the spectrophotometric determination of bismuth content by dithiodiantipyridinemethane: This document applies to the determination of iron ore, iron concentrate and lump ore, including the determination of bismuth content in sintered products, the determination range (mass fraction): 0:0020%~0:200%:

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document: GB/T 6682 Analysis Laboratory Water Specifications and Test Methods GB/T 6730:1 Preparation of pre-dried samples for iron ore analysis GB/T 7729 General Principles of Spectrophotometry for Chemical Analysis of Metallurgical Products GB/T 8170 Numerical Rounding Rules and Representation and Judgment of Limit Values GB/T 10322:1 Iron ore sampling and sample preparation method GB/T 12806 Laboratory glass instrument single-line volumetric flask GB/T 12807 Laboratory glass instrument indexing pipette GB/T 12808 Laboratory glass instrument single reticle pipette

3 Terms and Definitions

There are no terms and definitions that need to be defined in this document:

4 Principles

The sample is dissolved with hydrochloric acid, hydrofluoric acid and nitric acid, the sulfuric acid emits smoke, and the residue is melted with potassium pyrosulfate: In 0:5mol/L nitric acid medium, the Manganese dioxide was used as a carrier to precipitate bismuth, and the filtered precipitate was dissolved in hydrochloric acid-hydrogen peroxide solution, heated and concentrated: at a pH of 2 to 3 In the hydrochloric acid medium, bismuth and dithiodiantipyridine methane form a red complex, and the absorbance is measured at the wavelength of 525nm with a spectrophotometer: degree to calculate the bismuth content:

5 Reagents

Unless otherwise specified, only use approved analytical reagents and distilled water of grade 3 or higher in accordance with GB/T 6682 or its equivalent: Water of comparable purity: ......

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