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GB/T 11926-2025: Determination of phosphorus in uranium dioxide powder and pellets - Molybdenum blue spectrophotometric method
Status: Valid GB/T 11926: Evolution and historical versions
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Determination of phosphorus in uranium dioxide powder and pellets - Molybdenum blue spectrophotometric method
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GB/T 11926-2025
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| GB/T 11926-1989 | English | 159 |
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Uranium dioxide powder and pellet. Determination of phosphorus. Molybdenum blue spectrophotometric method
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GB/T 11926-1989
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Basic data | Standard ID | GB/T 11926-2025 (GB/T11926-2025) | | Description (Translated English) | Determination of phosphorus in uranium dioxide powder and pellets - Molybdenum blue spectrophotometric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | F46 | | Classification of International Standard | 27.120 | | Word Count Estimation | 10,158 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2025-08-29 | | Older Standard (superseded by this standard) | GB/T 11926-1989 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 11926-2025: Determination of phosphorus in uranium dioxide powder and pellets - Molybdenum blue spectrophotometric method
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ICS 27.120
CCSF46
National Standard of the People's Republic of China
Replaces GB/T 11926-1989
Determination of phosphorus in uranium dioxide powder and pellets
Molybdenum blue spectrophotometry
Released on August 29, 2025
Implementation on August 29, 2025
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Ascorbic acid-molybdenum blue spectrophotometry 1
5 Bismuth salt ascorbic acid-molybdenum blue spectrophotometry 3
6 Experimental data processing 4
7 Precision 5
8 Test Report 5
Preface
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 replaces GB/T 11926-1989 "Determination of phosphorus in uranium dioxide powder and pellets - Molybdenum blue spectrophotometric method"
Compared with GB/T 11926-1989, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
--- Changed the range from “(50~300)μg/g” to “10μg/g~300μg/g” (see Chapter 1, Chapter 1 of the 1989 edition);
--- Changed the sample weight in the ascorbic acid-molybdenum blue spectrophotometry method from 0.2g to 0.2g and 0.5g (see 4.4.2, 1989
Chapter 6 of the.2001 edition);
--- Changed the content of sample dissolution in the test steps, and changed the dissolution method of powder and pellets in the ascorbic acid-molybdenum blue spectrophotometry to
Harmonization (see 4.5.2, Chapter 6 of the 1989 edition);
--- Added the detection method of "Bismuth salt ascorbic acid-molybdenum blue spectrophotometry" (see Chapter 5).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed and coordinated by the National Technical Committee for Nuclear Energy Standardization (SAC/TC58).
This document was drafted by. China National Nuclear Corporation Northern Nuclear Fuel Components Co., Ltd., China National Nuclear Corporation Jianzhong Nuclear Fuel Components Co., Ltd., and China Nuclear Industry Beijing Chemical Industry Co., Ltd.
Metallurgical Research Institute, Nuclear Industry Standardization Institute.
The main drafters of this document are. Yang Lichun, Tang Hui, Zhao Shenglu, Pan Cuicui, Chen Huihui, Li Honggang, Yang Yongming, Guo Guolong, Yang Xuewei, Niu Li,
Cui Jing, Li Xin, Zhao Bing, Chen Changyou, Wang Haisheng, Dong Qiushi, and Zhao Suyu.
The previous versions of this document and the documents it replaces are as follows.
---First published in 1989 as GB/T 11926-1989;
---This is the first revision.
Determination of phosphorus in uranium dioxide powder and pellets
Molybdenum blue spectrophotometry
1 Scope
This document describes the determination of phosphorus content in uranium dioxide powder and pellets using the molybdenum blue spectrophotometric method.
This document is applicable to the determination of phosphorus in uranium dioxide powder and pellets, and is used as a reference for the determination of phosphorus in uranium oxides such as uranium trioxide.
The determination range of this document is 10μg/g~300μg/g, and the allowable impurity amount is Co0.2mg/g; Ni0.4mg/g; Fe, Mn, Cr, Sn,
Cu, V, W, Si, Ti, F, and Zn are all 0.5 mg/g.
2 Normative references
This document has no normative references.
3 Terms and Definitions
There are no terms or definitions that require definition in this document.
4 Ascorbic acid-molybdenum blue spectrophotometry
4.1 Principle
The sample is dissolved in hydrochloric acid-hydrogen peroxide or nitric acid-perchloric acid. In the hydrochloric acid medium, the phosphorus in the sample reacts with ammonium molybdate to form phosphomolybdate yellow heteropolyphosphate.
The sample was reduced to phosphomolybdenum blue heteropoly acid by ascorbic acid and the absorbance of phosphomolybdenum blue was measured at 650nm.
Phosphorus content.
4.2 Reagents or materials
Unless otherwise specified, the reagents used in the analysis are all high-grade pure reagents that meet national standards, and the water used for analysis is of low conductivity (25°C).
Deionized water at 0.10mS/m.
4.2.1 Hydrochloric acid. ρ(HCl) = 1.19 g/mL.
4.2.2 Hydrogen peroxide. ω(H2O2)=30%.
4.2.3 Hydrochloric acid solution. φ(HCl) = 50%, prepared by mixing hydrochloric acid (4.2.1) with water.
4.2.4 Ammonium molybdate solution. ρ[(NH4)6Mo7O24·4H2O]=50g/L.
Weigh 25g of ammonium molybdate (analytical grade) and dissolve it in hot water (water temperature 50℃~60℃), dilute to 500mL, shake well, and store in a plastic bottle.
Filter if necessary.
4.2.5 Ascorbic acid solution. ρ(C6H8O6) = 10 g/L.
Weigh 1.0 g of ascorbic acid (analytical grade) and dissolve it in water, dilute to 100 mL, shake well, and prepare before use.
4.2.6 Phosphorus standard stock solution.
Accurately weigh about 1.098 g of potassium dihydrogen phosphate standard material (pre-dried at 105°C for 1.5 h) to the nearest 0.1 mg and place it in 100 mL
Dissolve in water in a beaker, transfer to a 500mL volumetric flask, add 5mL of hydrochloric acid (4.2.1), dilute to the mark with water, and shake well.
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