GB/T 24583.1-2019Vanadium-nitrogen alloy - Determination of the vanadium content - Ammonium ferrous sulfate titration method (English PDF)

Foreword

GB/T 24583 Vanadium-nitrogen alloy analysis method is divided into 8 parts:

- GB/T 24583.1 Vanadium-nitrogen - Determination of vanadium content - Ammonium ferrous sulfate titration method;

- GB/T 24583.2 Vanadium-nitrogen - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas;

- GB/T 24583.3 Vanadium-nitrogen - Determination of nitrogen content - Distillation-neutralization titration method;

- GB/T 24583.4 Vanadium-nitrogen - Determination of carbon content - Infrared absorption method;

- GB/T 24583.5 Vanadium-nitrogen - Determination of phosphorus content - Bismuth molybdenum blue spectrophotometric method;

- GB/T 24583.6 Vanadium-Nitrogen alloy - Determination of sulfur content - The infrared absorption method;

- GB/T 24583.7 Vanadium-nitrogen - Determination of oxygen content - Infrared absorption method;

- GB/T 24583.8 Vanadium-nitrogen - Determination of silicon, manganese, phosphorus, aluminum content - Inductively coupled plasma atomic emission spectrometric method.

This Part is Part 1 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 24583.1-2009 "Vanadium-Nitrogen alloy - Determination of vanadium content - The ammonium ferrous sulfate titration method". Compared with GB/T 24583.1-2009, the main technical changes in this Part are as follows:

- Modify "Normative references" (see Clause 2; Clause 2 of the 2009 edition);

- ADD "Instruments" (see Clause 5);

- Modify the concentration and calibration method of the standard titration solution of ammonium ferrous sulfate (see 4.11; 4.10 of the 2009 edition);

- Modify the method of sampling and sample preparation (see Clause 6;

Caution - The personnel using this Part shall have hands-on experience in formal laboratory work. This Part does not address all possible safety problems. 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 vanadium content in vanadium-nitrogen alloy by ammonium ferrous sulfate titration method.

This Part applies to the determination of vanadium content in vanadium-nitrogen alloy. Measuring range (mass fraction): >=60.00%.

2 Normative references

The following documents are indispensable for the application of this document.

For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document.

GB/T 6379.1 Accuracy (trueness and precision) of measurement methods and results - Part 1: General principles and definitions

GB/T 6379.2 Accuracy (trueness and precision) of measurement methods and results - Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method

GB/T 6682 Water for analytical laboratory use - Specification and test methods

GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values

GB/T 12805 Laboratory glassware - Burettes

GB/T 12806 Laboratory glassware - One-mark volumetric flasks

4 Reagents and materials

DILUTE to the mark and mix well.

4.11 Standard titration solution of ammonium ferrous sulfate, about 0.07 mol/L.

4.12 Vanadium pentoxide solution, 4.0 mg/mL.

7 Analytical procedures

ammonium ferrous sulfate to titrate. When closing to the end point, TITRATE slowly until the solution is changed from fuchsia to bright yellow-green as the end point. The volume of the standard titration solution of ammonium ferrous sulfate consumed is V3. The sample analysis reagent blank V0=V2-V3.