GB/T 10267.2-2025 English PDF

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GB/T 10267.2-2025: Methods for analysis of calcium metal - Part 2: Determination of micro-amounts of silicon by spectrophotometry
Status: Valid

GB/T 10267.2: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 10267.2-2025	219	Add to Cart	3 days	Methods for analysis of calcium metal - Part 2: Determination of micro-amounts of silicon by spectrophotometry	Valid
GB/T 10267.2-1988	139	Add to Cart	2 days	Method for analysis of calcium metal. The determination of micro-amounts of silicon by photometric method

Basic data

Standard ID: GB/T 10267.2-2025 (GB/T10267.2-2025)
Description (Translated English): Methods for analysis of calcium metal - Part 2: Determination of micro-amounts of silicon by spectrophotometry
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H12
Classification of International Standard: 77.120
Word Count Estimation: 10,145
Date of Issue: 2025-08-01
Date of Implementation: 2026-02-01
Older Standard (superseded by this standard): GB/T 10267.2-1988
Issuing agency(ies): State Administration for Market Regulation, Standardization Administration of China

GB/T 10267.2-2025: Methods for analysis of calcium metal - Part 2: Determination of micro-amounts of silicon by spectrophotometry

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT10267.2-2025
ICS 77.120 CCSH12 National Standard of the People's Republic of China Replaces GB/T 10267.2-1988 Metal Calcium Analysis Method Part 2.Photometric determination of trace amounts of silicon Released on August 1, 2025 Implementation on February 1, 2026 State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Principle 1 5 Reagents or materials 1 6 Instruments and Equipment 2 7 Sample 2 8 Test Step 2 9 Experimental data processing 3 10 Precision 3 11 Quality Assurance and Control 3 12 Test Report 3 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 is Part 2 of GB/T 10267 “Analysis of Metallic Calcium”. GB/T 10267 has been published in the following parts. --- Part 1.Determination of chlorine by chloride ion selective electrode method; --- Part 2.Photometric determination of trace silicon; --- Part 3.Direct determination of iron, nickel, copper, manganese and magnesium by atomic absorption spectrophotometry; --- Part 4.Spectrophotometric determination of aluminum using 8-hydroxyquinoline-chloroform extraction; --- Part 5.Determination of nitrogen using the distillation-Nessler reagent photometric method. This document replaces GB/T 10267.2-1988 "Analysis of metallic calcium - Photometric determination of trace amounts of silicon" and GB/T 10267.2- Compared with 1988, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) The description of the relevant content in "Scope" has been changed (see Chapter 1, Chapter 1 of the 1988 edition); b) Added relevant content of standard substances/standard samples in “reagents or materials” (see 5.14); c) Added the requirements for sample status in "Sample" (see 7.1); d) The limitation of the “sand bath” heating method in the “blank test” has been changed (see 8.2, 5.2.2 of the 1988 edition); e) The calculation formula in “Test Data Processing” has been changed (see Chapter 9, Chapter 6 of the 1988 edition); f) The description of the relevant content in "Precision" has been changed (see Chapter 10, Chapter 7 of the 1988 edition); g) Added the description of “quality assurance and control” (see Chapter 11); h) Added the description of the relevant content of "test report" (see Chapter 12). 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 Element Co., Ltd., Sichuan Honghua Industrial Co., Ltd., China National Nuclear Corporation 404 Co., Ltd., Hanzhong Zinc Industry Special Materials Co., Ltd. The main drafters of this document are. Shen Yanan, Chen Yanhong, Yang Guangyu, Yang Yongming, Wang Yunjuan, Yang Lichun, Yuan Yulong, Zhao Shenglu, Ji Qiuyu, Jia Lingyu, Li Jiajia, An Ning, Sun Xin, Liu Qing, Duan Changping, and Luo Yuanyuan. The previous versions of this document and the documents it replaces are as follows. ---First published in 1988 as GB/T 10267.2-1988; ---This is the first revision.

introduction

This document is an important standard in the field of metal calcium detection in my country. Since its release in 1988, it has provided a reference for the determination of silicon content in metal calcium. It has a scientific basis and is widely used in the nuclear industry, metallurgy and new materials research and development. GB/T 10267 "Analysis of Metallic Calcium" aims to provide the analysis method of the chemical composition of metallic calcium and is intended to consist of 5 parts. --- Part 1.Determination of chlorine using a chloride ion selective electrode. The purpose is to establish a method for the determination of chlorine content in metallic calcium. --- Part 2.Photometric determination of trace silicon. The purpose is to establish a method for the determination of silicon content in metallic calcium. --- Part 3.Direct determination of iron, nickel, copper, manganese and magnesium by atomic absorption spectrophotometry. The purpose is to establish the direct determination of iron, nickel, copper, manganese and magnesium in metallic calcium. Direct determination method of manganese and magnesium content. --- Part 4.8-Hydroxyquinoline-chloroform extraction spectrophotometric determination of aluminum. The purpose is to establish the determination of aluminum content in metallic calcium. Determine the method. --- Part 5.Determination of nitrogen by distillation-Nessler reagent photometric method. The purpose is to establish a method for the determination of nitrogen content in metallic calcium. With the advancement of analytical technology and the diversification of heating methods, silicon standard stock solutions can be directly purchased from certified national standard solutions. The photometric method for determining silicon content is simple to operate and reflects the latest level of industry development. The detection method is scientific and reliable for metallic calcium products produced by various processes. Metal Calcium Analysis Method Part 2.Photometric determination of trace amounts of silicon

1 Scope

This document describes the analytical method for the photometric determination of silicon content in metallic calcium, including reagents or materials, instruments and equipment, samples, test steps, procedures, test data processing, precision, quality assurance and control, and test reporting. This document is applicable to the determination of silicon content in metallic calcium. Measurement range. 10μg/g~320μg/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 Principles The sample is dissolved in hydrochloric acid solution. Under certain concentration of hydrochloric acid, ammonium molybdate reacts with silicon in metallic calcium to form silicon molybdenum yellow, which increases the salt content in the solution. The concentration of acid was adjusted to eliminate the interference of phosphorus, and molybdenum yellow was reduced to molybdenum blue with ascorbic acid. Its absorbance was measured at 650nm. The silicon content in the sample was obtained from the curve.

5 Reagents or materials

Unless otherwise specified, the water used for analysis was deionized water with a conductivity of ≤0.10 mS/m (25°C). 5.1 Hydrochloric acid. analytical grade, ρ(HCl) = 1.19 g/mL. 5.2 Ammonium molybdate. analytical grade. 5.3 Ascorbic acid. analytical grade. 5.4 Calcium carbonate. spectrally pure. 5.5 Silicon dioxide. spectrally pure, calcined at 750°C–850°C for 2 h before use and cooled to room temperature in a desiccator. 5.6 Ammonia. Premium grade ammonia needs to be purified before use. 5.7 Anhydrous sodium carbonate. standard reagent. 5.8 p-Nitrophenol. analytical grade. 5.9 Hydrochloric acid solution. φ(HCl) = 50%, prepared by mixing (5.1) with water. 5.10 Ammonium molybdate solution. ρ[(NH4)6MO7O24·4H2O]=50 g/L. Weigh 5.0 g of ammonium molybdate (5.2) into a beaker, dissolve it in water and dilute it to 100 mL. Store it in a plastic bottle and filter it if necessary. 5.11 Ascorbic acid solution. ρ(C6H8O6) = 10 g/L. Weigh 1.0 g of ascorbic acid (5.3) into a beaker, dissolve it in water and dilute to 100 mL, mix well, and prepare it before use. 5.12 Matrix calcium solution. ρ(Ca) = 0.05 g/mL. Weigh 12.51 g of calcium carbonate (5.4) into a plastic beaker, add 20 mL of water, and slowly add 25 mL of hydrochloric acid solution (5.1) in several times. ......

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