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GB/T 26416.9-2023: Chemical analysis methods for rare earth ferroalloy - Part 9: Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometry
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Chemical analysis methods for rare earth ferroalloy - Part 9: Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometry
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GB/T 26416.9-2023
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Basic data | Standard ID | GB/T 26416.9-2023 (GB/T26416.9-2023) | | Description (Translated English) | Chemical analysis methods for rare earth ferroalloy - Part 9: Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometry | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H14 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 8,858 | | Date of Issue | 2023-05-23 | | Date of Implementation | 2023-12-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 26416.9-2023: Chemical analysis methods for rare earth ferroalloy - Part 9: Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometry
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ICS 77:120:99
CCSH14
National Standards of People's Republic of China
Chemical Analysis Methods of Rare Earth Ferroalloys
Part 9: Determination of phosphorus content
Bismuth Phosphomolybdenum Blue Spectrophotometry
Released on 2023-05-23
2023-12-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Management Committee
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 for Standardization Documents"
drafting:
This document is part 9 of GB/T 26416 "Methods for Chemical Analysis of Rare Earth Ferroalloys": GB/T 26416 has issued the following
part:
--- Part 1: Determination of the total amount of rare earth;
--- Part 2: Determination of rare earth impurity content Inductively coupled plasma emission spectrometry;
--- Part 3: Determination of calcium, magnesium, aluminum, nickel, manganese content Inductively coupled plasma emission spectrometry;
--- Part 4: Determination of iron content Potassium dichromate titration method;
--- Part 5: Determination of oxygen content pulse-infrared absorption method;
--- Part 6: Determination of molybdenum, tungsten and titanium content Inductively coupled plasma emission spectrometry;
--- Part 7: Determination of carbon and sulfur content High-frequency-infrared absorption method;
--- Part 8: Photometric method for the determination of the amount of silicon;
--- Part 9: Determination of phosphorus content Bismuth phosphomolybdenum blue spectrophotometry:
Please note that some contents of this document may refer to patents: The issuing agency of this document assumes no responsibility for identifying patents:
This document is proposed and managed by the National Rare Earth Standardization Technical Committee (SAC/TC229):
This document is drafted by: Ganzhou Institute of Nonferrous Metallurgy Co:, Ltd:, Qiandong Rare Earth Group Co:, Ltd:, Sichuan Leshan Ruifengye
Gold Co:, Ltd:, China Nonferrous Metals Guilin Institute of Mineral Geology Co:, Ltd:, Dingnan Dahua New Material Resources Co:, Ltd:, North China Rare Earth (Group) Co:, Ltd:
Group) High-Tech Co:, Ltd:, Zhejiang Geological Exploration Institute of Sinochem Geology and Mine Administration:
The main drafters of this document: Xie Lingjun, Zhang Wenxing, Xiao Juan, Li Ying, Wen Bin, Chen Chong, Liu Hong, Zhu Ni, Li Jianhu, Lu Meiling, Miao Fengmei,
Xu Ning, Qiu Li, Sun Linjing, Chen Tao, Chen Chunfa:
Introduction
The rare earth iron alloy referred to in this document refers to the master alloy composed of iron and one or more rare earth elements, generally adopts molten salt electrolysis or fusion
It is mainly used as an additive for magnetic materials such as NdFeB permanent magnet materials, magnetostrictive materials, optical and magnetic recording materials, or as a deoxidizer,
Additives, etc: are used in iron and steel smelting: Chemical composition is an important assessment index of rare earth ferroalloys: GB/T 26416 "Chemical Analysis of Rare Earth Ferroalloys
Method" integrates the industry standard XB/T 616-2012 "Chemical Analysis Method of Gadolinium-Fe Alloy", XB/T 621-2016 "Chemical Analysis Method of Holmium-Fe Alloy
Analytical Methods", XB/T 623-2018 "Chemical Analysis Methods of Ferro-Cerium Alloys", XB/T 624-2018 "Chemical Analysis Methods of Ferro-Yttrium Alloys", etc:
Focusing on all rare earth ferroalloys (including ferro-lanthanum, ferrocerium, ferro-lanthanum, ferro-ndium, ferrodysprosium, ferro-gadolinium, ferro-holmium and ferro-yttrium) that have achieved large-scale production at present
etc:) The chemical analysis method standards for the indicators that need to be assessed in production and application, including the total amount of rare earth, the content of rare earth impurities, and the content of non-rare earth impurities
detection etc: According to the different detection objects and detection methods, as well as the differences in substrates, etc:, GB/T 26416 consists of the following parts:
--- Part 1: Determination of the total amount of rare earth;
--- Part 2: Determination of rare earth impurity content Inductively coupled plasma emission spectrometry;
--- Part 3: Determination of calcium, magnesium, aluminum, nickel, manganese content Inductively coupled plasma emission spectrometry;
--- Part 4: Determination of iron content Potassium dichromate titration method;
--- Part 5: Determination of oxygen content pulse-infrared absorption method;
--- Part 6: Determination of molybdenum, tungsten and titanium content Inductively coupled plasma emission spectrometry;
--- Part 7: Determination of carbon and sulfur content High-frequency-infrared absorption method;
--- Part 8: Photometric method for the determination of the amount of silicon;
--- Part 9: Determination of phosphorus content Bismuth phosphomolybdenum blue spectrophotometry:
The above-mentioned standards have clarified the scope of application, standardized reagents, materials, test equipment and procedures, and have been repeatedly tested by many laboratories:
The precision data given by the repeated tests and verifications has enhanced the consistency and comparability of data between different laboratories, and provided a basis for the quality assurance of rare earth ferroalloys:
Establish a rigorous and standardized standardization work foundation:
This document mainly adopts the bismuth phosphomolybdenum blue spectrophotometric method to determine the phosphorus content in rare earth iron alloys, which has the advantages of wide measurement range, high sensitivity and stability:
Good sex and other characteristics: The precision data in this document is based on the joint test conducted by 7 laboratories on 5 samples with different levels in 2022:
Each laboratory independently measures the phosphorus content of each level 11 times under repeatability conditions, and conducts statistics according to GB/T 6379:2
analyze:
Chemical Analysis Methods of Rare Earth Ferroalloys
Part 9: Determination of phosphorus content
Bismuth Phosphomolybdenum Blue Spectrophotometry
1 Scope
This document describes the rare earth ferroalloys (lanthanum ferroalloy, cerium ferroalloy, lanthanum ferrocerium alloy, neodymium ferroalloy, dysprosium ferroalloy, gadolinium ferroalloy, holmium ferroalloy
Alloy, yttrium-iron alloy) Determination of phosphorus content:
This document is applicable to rare earth iron alloys (lanthanum-iron alloy, cerium-iron alloy, lanthanum-cerium-iron alloy, neodymium-iron alloy, dysprosium-iron alloy, gadolinium-iron alloy, holmium-iron alloy
Alloy, yttrium-iron alloy) Determination of phosphorus content: Measuring range (mass fraction): 0:0050%~0:20%:
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references
For documents, only the version corresponding to the date is applicable to this document; 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 8170 Numerical rounding off rules and expression and determination of limit values
3 Terms and Definitions
This document does not have terms and definitions that need to be defined:
4 Method Summary
The sample is decomposed by hydrochloric acid and nitric acid, and perchloric acid is added to smoke, and phosphorous acid is oxidized to orthophosphoric acid: In sulfuric acid medium, phosphorus, bismuth and ammonium molybdate
A yellow phosphorus, bismuth, and molybdenum ternary heteropolyacid is formed, which is reduced to a blue complex with ascorbic acid, and the absorption is measured at a spectrophotometer wavelength of 700nm:
Photometrically, calculate the phosphorus content:
5 Reagents or Materials
Unless otherwise specified, in the analysis, only reagents confirmed to be of analytical grade or higher and distilled substances of grade two or higher in accordance with GB/T 6682 were used:
Distilled or deionized water or water of equivalent purity: Prefer certified standard solutions:
5:1 Hydrochloric acid (ρ=1:19g/mL, superior grade):
5:2 Nitric acid (ρ=1:42g/mL, superior grade):
5:3 Perchloric acid (ρ=1:67g/mL):
5:4 Mixed acid solution: Add 37:5mL of hydrochloric acid (5:1) and 12:5mL of nitric acid (5:2), add 50mL of water, and mix well:
5:5 Sulfuric acid (1 3; superior grade):
5:6 Bismuth nitrate solution (10g/L): weigh 10g bismuth nitrate, put it in a:200mL beaker, add 30mL nitric acid (5:2), heat to dissolve
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