1 Scope
This Part of GB/T 223 specifies Cinchonine gravimetric method and tetraphenylarsonium chloride - rhodanate - methenyl choloride extraction spectrophotometric method for determination of tungsten content.
Cinchonine gravimetric method stated in this Part is applicable to determination of tungsten alloyed steel, high temperature alloy and precision alloy with tungsten mass fraction of 1.00%~22.00%.
The tetraphenylarsonium chloride - rhodanate - methenyl choloride extraction spectrophotometric method stated in this Part is applicable to determination of tungsten in carbon steel, alloyed steel and high temperature alloy with tungsten mass fraction of 0.050%~1.50%.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this Part of GB/T 223. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties whose enter into agreement according to this Part are encouraged to research whether the latest editions of these documents are applied or not. For undated references, the latest edition of the normative document referred to applies.
GB/T 223.12 Methods for chemical analysis of iron, steel and alloy The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content
GB/T 223.14 Methods for Chemical Analysis Of Iron, Steel And Alloy - The Ammonium Ferrous Sulfate Titration Method tor the Determination Of Vanadium Content
GB/T 223.26 Methods for Chemical Analysis of Iron Steel and Alloy - the Thiocyanate Direct Photometric Method for the Determination of Molybderum Content
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 20066 Steel and Iron - Sampling and Preparation of Samples for the Determination of Chemical Composition
Contents
1 Scope
2 Normative References
3 Method 1: Cinchonine Gravimetric Method
4 Method 2: Tetraphenylarsonium chloride - rhodanate - methenyl choloride extraction spectrophotometric method
5 Test Report
Appendix A (Informative) Source Data of Precision Test
