GB/T 7731.17-2023Ferrotungsten—Determination of cobalt, nickel and aluminum contents—Inductively coupled plasma atomic emission spectrometric method (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document is Part 17 of GB/T 7731. GB/T 7731 has released the following parts.

---Determination of ferrotungsten tungsten content by cinchonine gravimetric method and ammonium nitrate gravimetric method;

---Determination of tungsten ferromanganese content by periodate spectrophotometry and flame atomic absorption spectrometry;

---Determination of tungsten iron and copper content by dicyclohexanone oxalyl dihydrazone photometry and flame atomic absorption spectrometry;

---Determination of tungsten iron phosphorus content by phosphomolybdenum blue spectrophotometry;

---Determination of ferrotungsten silicon content by silicon-molybdenum blue spectrophotometry;

---Determination of tungsten iron and arsenic content by molybdenum blue photometry and inductively coupled plasma atomic emission spectrometry;

---Determination of tungsten-iron-tin content by phenylfluorone photometry and inductively coupled plasma atomic emission spectrometry;

---Determination of iron tungsten and antimony content by Rhodamine B photometry and inductively coupled plasma atomic emission spectrometry;

---Determination of tungsten iron and bismuth content by bismuth iodide photometry and inductively coupled plasma atomic emission spectrometry;

---Determination of tungsten ferrocarbon content by infrared absorption method;

---Determination of tungsten iron sulfur content by infrared absorption method and combustion neutralization titration method;

---Determination of ferrotungsten lead content by polarography and inductively coupled plasma atomic emission spectrometry;

---Determination of tungsten ferrocobalt, nickel and aluminum content by inductively coupled plasma atomic emission spectrometry.

Introduction

Since there are many detection elements involved in the ferrotungsten detection process, the applicable scope and applicable methods of the elements are different. To ensure tungsten The iron detection standards are convenient and accurate. For the analysis methods of different elements of ferrotungsten, a national standard system has been established to support ferrotungsten detection.

GB/T 7731 Ferrotungsten series analysis methods are the basic standards for ferrotungsten testing in my country and consist of 13 parts.

---Determination of ferrotungsten tungsten content by cinchonine gravimetric method and ammonium nitrate gravimetric method. The purpose is to measure the tungsten content in ferrotungsten, using Cinchonine gravimetric method and ammonium nitrate gravimetric method.

---Determination of tungsten ferromanganese content by periodate spectrophotometry and flame atomic absorption spectrometry. The purpose is to measure the ferrotungsten Manganese content, using periodate spectrophotometry and flame atomic absorption spectrometry.

---Determination of tungsten iron and copper content by dicyclohexanone oxalyl dihydrazone photometry and flame atomic absorption spectrometry. The purpose is to measure ferrotungsten The copper content in the sample was measured using dicyclohexanone oxalyl dihydrazone photometry and flame atomic absorption spectrometry.

---Determination of tungsten iron phosphorus content by phosphomolybdenum blue spectrophotometry. The purpose is to measure the phosphorus content in ferrotungsten, using phosphorus molybdenum blue spectroscopy. Photometry.

---Determination of tungsten ferrosilicon content by silicon-molybdenum blue spectrophotometry. The purpose is to measure the silicon content in ferrotungsten, using silicon-molybdenum blue spectroscopy. Photometry.

---Determination of tungsten iron and arsenic content by molybdenum blue photometry and inductively coupled plasma atomic emission spectrometry. The purpose is to measure ferrotungsten The arsenic content in the samples was measured using molybdenum blue photometry and inductively coupled plasma atomic emission spectrometry.

---Determination of tungsten-iron-tin content by phenylfluorone photometry and inductively coupled plasma atomic emission spectrometry. The purpose is to test To measure the tin content in ferrotungsten, phenylfluorone photometry and inductively coupled plasma atomic emission spectrometry were used.

---Determination of tungsten iron and antimony content by Rhodamine B photometry and inductively coupled plasma atomic emission spectrometry. The purpose is to test To measure the antimony content in ferrotungsten, rhodamine B photometry and inductively coupled plasma atomic emission spectrometry were used.

--- Determination of tungsten iron and bismuth content by bismuth iodide photometry and inductively coupled plasma atomic emission spectrometry. The purpose is to measure tungsten The bismuth content in iron was measured using bismuth iodide photometry and inductively coupled plasma atomic emission spectrometry.

---Determination of tungsten ferrocarbon content by infrared absorption method. The purpose is to measure the carbon content in ferrotungsten, using infrared absorption method.

---Determination of tungsten iron sulfur content by infrared absorption method and combustion neutralization titration method. The purpose is to measure the sulfur content in ferrotungsten. Use infrared absorption method and combustion neutralization titration method.

---Determination of ferrotungsten lead content by polarography and inductively coupled plasma atomic emission spectrometry. The purpose is to measure the ferrotungsten Lead content was determined by polarography and inductively coupled plasma atomic emission spectrometry.

---Determination of tungsten ferrocobalt, nickel and aluminum content by inductively coupled plasma atomic emission spectrometry. The purpose is to measure the ferrotungsten Cobalt, nickel, and aluminum contents were measured using inductively coupled plasma atomic emission spectrometry.

Determination of tungsten ferrocobalt, nickel and aluminum content Inductively coupled plasma atomic emission spectrometry Warning---Personnel using this document should have regular laboratory work experience. This document does not address all possible security issues question. Users are responsible for taking appropriate safety and health measures and ensuring compliance with the conditions stipulated in relevant national laws and regulations.

1 Scope

This document specifies the measurement of cobalt, nickel, and aluminum content in ferrotungsten using inductively coupled plasma atomic emission spectrometry.

This document is applicable to the determination of cobalt, nickel and aluminum content in ferrotungsten. Determination range (mass fraction). 0.010%~5.00%.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 4010 Collection and preparation of samples for chemical analysis of iron alloys

GB/T 6682 Specifications and test methods for water used in analytical laboratories

GB/T 8170 Numerical rounding rules and expression and determination of limit values

3 Terms and definitions

There are no terms or definitions to be defined in this document.

4 Principles

The sample is decomposed with oxalic acid-hydrogen peroxide, mixed acid is added to form tungsten acid precipitate, the tungsten is separated by filtration, and the solution is introduced into inductively coupled plasma.

Measure the spectral intensity of cobalt, nickel, and aluminum in the atomic emission spectrometer, and find out the content of cobalt, nickel, and aluminum on the calibration curve.

5 Reagents and materials

Unless otherwise stated, only reagents confirmed to be of analytical grade and distilled water of grade 2 or above complying with GB/T 6682 or above are used in the analysis. Its purity is comparable to water.

5.1 Oxalic acid, excellent grade pure.

5.2 Hydrogen peroxide, density rho=1.10g/mL, excellent grade pure.

5.3 Hydrochloric acid, density rho=1.19g/mL.

5.4 Sulfuric acid, density rho=1.84g/mL.

5.5 Nitric acid, density rho=1.42g/mL.

5.6 Mixed acid, sulfuric acid. hydrochloric acid. water = 1.4.2 (when preparing, add sulfuric acid to water slowly, then add hydrochloric acid).

5.7 Standard storage solutions for cobalt, nickel and aluminum. a) Cobalt standard storage solution, 1.0 mg/mL.