GB/T 42794-2023 Ferronickel - Determination of carbon, sulfur, silicon, phosphorus, nickel, cobalt, chromium and copper contents -
Spark atomic emission spectrometry
WARNING - Persons using this document shall be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions.
1 Scope
This document describes the determination of carbon, sulfur, silicon, phosphorus, nickel, cobalt, chromium and copper contents in ferronickel by spark atomic emission spectrometry.
This document is applicable to the routine chemical composition analysis of ferronickel products. The determination ranges of each element are shown in Table 1.
Table 1 Elements and determination ranges
Element Determination range (mass fraction)
%
C 0.017~2.5
S 0.018~0.25
Si 0.06~4.2
P 0.005~0.040
Ni 14.5~42.0
Co 0.10~2.2
Cr 0.25~2.3
Cu 0.003~0.25
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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 6379.6 Accuracy (trueness and precision) of measurement methods and results - Part 6: Use in practice of accuracy values
GB/T 25050 Ferronickel ingots or pieces - Sampling for analysis
GB/T 25051 Ferronickel shot - Sampling for analysis
3 Terms and definitions
No terms and definitions are defined in this document.
4 Rationale
The prepared ferronickel bulk sample generates electric discharge against the counter electrode under the action of the spark light source. The electric spark melts the specimen surface, further vaporizes and excites it to emit light. When the atoms or ions of the element to be determined are excited, electrons transition between different energy levels inside the atoms. Characteristic spectral lines are generated when electrons transition from a high energy level to a low energy level. The spectral intensities of the characteristic lines of the selected analytical elements and the internal standard element are measured. The content of the element to be determined is calculated via the calibration curve based on the spectral intensity (or intensity ratio) of the element to be determined in the sample.
5 Reagents and materials
5.1 Electrode brush
An electrode brush is a steel wire brush used to remove the black residual deposits on the electrode tip after the excitation of the specimen.
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Rationale
5 Reagents and materials
6 Instruments
7 Sampling and sample preparation
8 Instrument preparation and analytical conditions
9 Analytical procedure
10 Precision
11 Judgment of trueness of laboratory measurement results
12 Test report
Annex A (Normative) Acceptance procedure of test results
Annex B (Informative) Information of common precision tests
GB/T 42794-2023 Ferronickel - Determination of carbon, sulfur, silicon, phosphorus, nickel, cobalt, chromium and copper contents -
Spark atomic emission spectrometry
WARNING - Persons using this document shall be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions.
1 Scope
This document describes the determination of carbon, sulfur, silicon, phosphorus, nickel, cobalt, chromium and copper contents in ferronickel by spark atomic emission spectrometry.
This document is applicable to the routine chemical composition analysis of ferronickel products. The determination ranges of each element are shown in Table 1.
Table 1 Elements and determination ranges
Element Determination range (mass fraction)
%
C 0.017~2.5
S 0.018~0.25
Si 0.06~4.2
P 0.005~0.040
Ni 14.5~42.0
Co 0.10~2.2
Cr 0.25~2.3
Cu 0.003~0.25
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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 6379.6 Accuracy (trueness and precision) of measurement methods and results - Part 6: Use in practice of accuracy values
GB/T 25050 Ferronickel ingots or pieces - Sampling for analysis
GB/T 25051 Ferronickel shot - Sampling for analysis
3 Terms and definitions
No terms and definitions are defined in this document.
4 Rationale
The prepared ferronickel bulk sample generates electric discharge against the counter electrode under the action of the spark light source. The electric spark melts the specimen surface, further vaporizes and excites it to emit light. When the atoms or ions of the element to be determined are excited, electrons transition between different energy levels inside the atoms. Characteristic spectral lines are generated when electrons transition from a high energy level to a low energy level. The spectral intensities of the characteristic lines of the selected analytical elements and the internal standard element are measured. The content of the element to be determined is calculated via the calibration curve based on the spectral intensity (or intensity ratio) of the element to be determined in the sample.
5 Reagents and materials
5.1 Electrode brush
An electrode brush is a steel wire brush used to remove the black residual deposits on the electrode tip after the excitation of the specimen.
Contents of GB/T 42794-2023
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Rationale
5 Reagents and materials
6 Instruments
7 Sampling and sample preparation
8 Instrument preparation and analytical conditions
9 Analytical procedure
10 Precision
11 Judgment of trueness of laboratory measurement results
12 Test report
Annex A (Normative) Acceptance procedure of test results
Annex B (Informative) Information of common precision tests
