GB/T 24583.3-2019 English PDF

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GB/T 24583.3-2019: Vanadium-nitrogen - Determination of nitrogen content - Distillation-neutralization titration method
Status: Valid

GB/T 24583.3: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 24583.3-2019	199	Add to Cart	3 days	Vanadium-nitrogen - Determination of nitrogen content - Distillation-neutralization titration method	Valid
GB/T 24583.3-2009	279	Add to Cart	3 days	Vanadium -- Nitrogen alloy -- Determination of nitrogen content -- The distillation-neutralization titration method	Obsolete

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GB/T 24583.4   GB/T 24583.1   GB/T 24583.2   GB/T 24583.6   GB/T 24583.7   GB/T 24583.5   

Basic data

Standard ID: GB/T 24583.3-2019 (GB/T24583.3-2019)
Description (Translated English): Vanadium-nitrogen - Determination of nitrogen content - Distillation-neutralization titration method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H11
Classification of International Standard: 77.100
Word Count Estimation: 10,168
Date of Issue: 2019-06-04
Date of Implementation: 2020-05-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 24583.3-2019: Vanadium-nitrogen - Determination of nitrogen content - Distillation-neutralization titration 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.
Vanadium-nitrogen--Determination of nitrogen content--Distillation-neutralization titration method ICS 77.100 H11 National Standards of People's Republic of China Replace GB/T 24583.3-2009 Determination of nitrogen content of vanadium-nitrogen alloy Distillation-neutralization titration Published on.2019-06-04 2020-05-01 implementation State market supervision and administration China National Standardization Administration issued

Foreword

The analysis method of GB/T 24583 vanadium nitrogen alloy is divided into 8 parts. --- GB/T 24583.1 Determination of vanadium content of vanadium-nitrogen alloys - Ammonium sulphate titration method; --- GB/T 24583.2 Determination of nitrogen content of vanadium-nitrogen alloys - Inert gas fusion heat conduction method; --- GB/T 24583.3 Determination of nitrogen content of vanadium-nitrogen alloys - Distillation - Neutralometric titration; --- GB/T 24583.4 Determination of carbon content of vanadium-nitrogen alloys - infrared absorption method; --- GB/T 24583.5 Determination of phosphorus content of vanadium-nitrogen alloys - bismuth phosphorus molybdenum blue spectrophotometric method; --- GB/T 24583.6 Determination of sulfur content of vanadium-nitrogen alloys by infrared absorption method; --- GB/T 24583.7 Determination of oxygen content of vanadium-nitrogen alloys - infrared absorption method; --- GB/T 24583.8 Determination of silicon, manganese, phosphorus and aluminium content of vanadium-nitrogen alloys by inductively coupled plasma atomic emission spectrometry. This part is the third part of GB/T 24583. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 24583.3-2009 "Determination of Nitrogen Content of Vanadium Nitrogen Alloys by Distillation - Neutralization Titration". This part and Compared with GB/T 24583.3-2009, the main technical changes are as follows. --- Change the measurement range (mass score) to "8.00%~20.00%" (see Chapter 1, Chapter 1 of the.2009 edition); ---Modified "normative references" (see Chapter 2, Chapter 2 of the.2009 edition); --- Revised the method of preparation and preparation of the sample (see Chapter 6, Chapter 6 of the.2009 edition); --- Modified by "heating and dissolving on a low temperature electric furnace" to "heating on an electric furnace until smoke is dissolved" (see 7.4, 7.4 of.2009 edition); --- Revised the determination and representation of the analysis results (see 8.2, 7.7.2 of the.2009 edition); --- Replace the allowable difference with the reproducibility limit r and the reproducibility limit R of the inter-laboratory precision test data statistics (see Chapter 9, Chapter 9 of the.2009 edition). This part was proposed by the China Iron and Steel Association. This part is under the jurisdiction of the National Technical Committee for the Production of Pig Iron and Ferroalloys (SAC/TC318). This section drafted by. Pangang Group Co., Ltd., Hegang Co., Ltd. Chengde Branch, the national quality supervision and inspection of vanadium and titanium products Center, Jiaocheng Yiwang Ferroalloy Co., Ltd., Qingdao Zhongkelian Laboratory Technology Service Co., Ltd., Metallurgical Industry Information Standards Institute. The main drafters of this section. Zhong Hua, Zhong Li, Wang Xuemei, Liu Chaoyang, Zheng Xiaomin, Su Yang, Li Lanjie, Yang Xinneng, Zhou Kailu, Zhang Wei, Liu Lin, Liu Yajian, Lu Chunsheng. The previous versions of the standards replaced by this section are. ---GB/T 24583.3-2009. Determination of nitrogen content of vanadium-nitrogen alloy Distillation-neutralization titration Cautions - Personnel using this section should have hands-on experience in formal laboratory work. This section does not point out all possible security questions. question. It is the responsibility of the user to take appropriate safety and health measures and to ensure compliance with the conditions set by the relevant national regulations.

1 Scope

This part of GB/T 24583 specifies the determination of nitrogen in vanadium-nitrogen alloys by distillation-neutralization titration. This section applies to the determination of nitrogen content in vanadium-nitrogen alloys. Measuring range (mass fraction). 8.00%~20.00%.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 6379.1 Accuracy of measurement methods and results (accuracy and precision) Part 1. General and definition GB/T 6379.2 Accuracy of measurement methods and results (accuracy and precision) Part 2. Determination of standard method of measurement Basic method of sex and reproducibility GB/T 6682 Analytical laboratory water specifications and test methods GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values GB/T 20567 vanadium nitrogen alloy

3 Principle

The sample is decomposed in a sulfur-phosphorus mixed acid medium, wherein the nitrogen is converted into an ammonium salt, and under the action of excess alkali, the generated ammonia gas is accompanied by water vapor. It is separated by distillation, and the vapor is condensed to form ammonia water. Absorbing ammonia water with boric acid solution, using sulfamic acid standard titration solution Titration.

4 reagents and materials

In the analysis, unless otherwise stated, only approved analytical reagents and distilled water of Grade III and above in accordance with GB/T 6682 are used. Or deionized water or water of equivalent purity. 4.1 sulfuric acid, ρ = 1.84 g/mL. 4.2 Phosphoric acid, ρ = 1.70 g/mL. 4.3 Boric acid solution, 25g/L. 4.4 sodium hydroxide solution, 500g/L. Weigh 500g of sodium hydroxide, dissolve it in 800mL of water, add a few grains of zinc, heat and boil for 10min, remove the cooling, remove the residual zinc particles, Dilute to 1000 mL with water, mix and store in plastic bottles. Note. Slowly add sodium hydroxide to the beaker with water and stir constantly. If the exotherm is large, it can be formulated in a water-cooled environment. 4.5 Methyl red-methine blue mixed indicator. 0.125 g of methyl red and 0.083 g of methylene blue were weighed, dissolved in 100 mL of ethanol, stored in a brown bottle, and mixed. ......

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