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GB/T 7731.7-2008: Ferrotungsten -- Determination of tin content -- Phenylfluorone photometric method and inductively coupled plasma-atomic emission spectrometry
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 7731.7-2008	English	229	Add to Cart	3 days [Need to translate]	Ferrotungsten -- Determination of tin content -- Phenylfluorone photometric method and inductively coupled plasma-atomic emission spectrometry
GB/T 7731.7-1987	English	199	Add to Cart	2 days [Need to translate]	Methods for chemical analysis of ferrotungsten--The phenylfluorone photometric method for the determination of tin content

GB/T 7731.7-2008: Ferrotungsten -- Determination of tin content -- Phenylfluorone photometric method and inductively coupled plasma-atomic emission spectrometry

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Ferrotungsten. Determination of tin content. Phenylfluorone photometric method and inductively coupled plasma-atomic emission spectrometry ICS 77.100 H11 National Standards of People's Republic of China Replacing GB/T 7731.7-1987 Tungsten, iron, tin content - Spectrophotometric And inductively coupled plasma atomic emission spectrometry Posted 2008-05-13 2008-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

"Spectrophotometric determination of tin content of iron chemical analysis of tungsten Phenylfluorone" This Part replaces GB/T 7731.7-1987. This portion of the GB/T 7731.7-1987 comparison, the main changes are as follows. --- Newly added by inductively coupled plasma atomic emission spectrometry; --- Standard text format has been revised text. This section is informative Appendix A Appendix. This part is proposed by the China Iron and Steel Association. This section is under the jurisdiction of Metallurgical Industry Information Standards Institute. This section is drafted. Sichuan Investment Emei Ferroalloy (Group) Co., Ltd. The main drafters of this section. should Tang Hua, Fang Yan, Liu Huili, Zhangying Xia. This part of the standard replaces the previous editions are. --- GB/T 7731.7-1987. Tungsten, iron, tin content - Spectrophotometric And inductively coupled plasma atomic emission spectrometry Warning. Use of this section shall be a person experiences regular laboratory work. This section does not indicate that all possible security issues. Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.

1 Scope

This section specifies the determination of the amount of tin tungsten iron spectrometry with Spectrophotometric and inductively coupled plasma atomic emission. This section applies to the determination of tungsten iron tin content measurement range (mass fraction). 0.01% to 0.12%.

2 Normative references

The following documents contain provisions which, through reference in this section constitute provisions of this section. For dated references, subsequent All amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to reach an agreement under this section Research on whether to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section. GB/T 4010 alloy chemical analysis and preparation of samples 3 Method One. Spectrophotometric 3.1 Principle Sample with nitric acid - hydrofluoric acid dissolution, white smoke sulfuric acid, tartaric acid containing sulfuric acid solution, hydrogen sulfide tin and copper, Arsenic and other co-precipitation, separation. Nitric acid and sulfuric acid dissolved in sulfuric acid and potassium permanganate and manganese tin and manganese dioxide coprecipitation separation. use Hydrochloric acid and hydrogen peroxide dissolved by adding tartaric acid, oxalic acid, polyvinyl alcohol masking interfering elements to adjust the pH value of the aqueous ammonia was added Phenylfluorone Tin tin generation - Phenylfluorone complex, measuring the absorbance. 3.2 Reagents and materials Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled water or its equivalent purity water. 3.2.1 tartaric, solid. 3.2.2 ascorbic acid, solid. 3.2.3 hydrofluoric acid, ρ1.15g/mL. 3.2.4 nitrate, ρ1.42g/mL. 3.2.5 sulfate, ρ1.84g/mL. 3.2.6 hydrogen peroxide, ρ1.10g/mL. 3.2.7 hydrochloric acid, 1 + 1. 3.2.8 nitric acid, 1 + 1. 3.2.9 sulfate, 1 + 1. 3.2.10 ammonia, ρ0.90g/mL. 3.2.11 ammonia, 1 + 8. 3.2.12 hydrogen sulfide. 3.2.13 tartaric acid washing liquid, take 1g of tartaric acid were dissolved in 100mL saturated hydrogen sulfide sulfuric acid (1 + 100). 3.2.14 manganese sulfate solution, 20g/L, manganese sulfate weighed 20g [MnSO4 · (4 ~ 6) H2O) was dissolved in water and diluted to 1000mL, Mix well. 3.2.15 potassium permanganate solution, 30g/L. ...