GB/T 223.43-2008 in English

《GB/T 223.43-2008钢铁及合金 钨含量的测定 重量法和分光光度法》由TC183（全国钢标准化技术委员会）归口，TC183SC5（全国钢标准化技术委员会钢铁及合金化学成份测定分会）执行，主管部门为中国钢铁工业协会。
ＧＢ／Ｔ２２３的本部分代替ＧＢ／Ｔ２２３．４３―１９９４《钢铁及合金化学分析方法　钨量的测定》。 ＧＢ／Ｔ２２３的本部分规定了用辛可宁重量法和氯化四苯胂?硫氰酸盐?三氯甲烷萃取分光光度法测定钨含量。
本部分辛可宁重量法适用于合金钢、高温合金和精密合金中质量分数为１．００％～２２．００％钨量的测定。
本部分氯化四苯胂?硫氰酸盐?三氯甲烷萃取分光光度法适用于碳钢、合金钢和高温合金中质量分数为０．０５０％～１．５０％钨含量的测定。 本部分与ＧＢ／Ｔ２２３．４３―１９９４相比较主要进行了以下修改：
―――名称改为《钢铁及合金　钨含量的测定　重量法和分光光度法》；
―――增加了分析中对试剂和水的说明内容并修改溶液浓度的表示方法；
―――修改了称取试料量表示；
―――修改了结果计算式中量的表示；
―――修改规范了对精密度函数式的说明。

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