GB/T 4324.1-2012 English PDF

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GB/T 4324.1-2012: Methods for chemical analysis of tungsten -- Part 1: Determination of lead content -- Flame atomic absorption spectrometry
Status: Valid

GB/T 4324.1: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 4324.1-2012	189	Add to Cart	3 days	Methods for chemical analysis of tungsten -- Part 1: Determination of lead content -- Flame atomic absorption spectrometry	Valid
GB/T 4324.1-1984	199	Add to Cart	2 days	Methods for chemical analysis of tungsten--The square wave polarographic method for the successive determination of lead and cadmium contents	Obsolete

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Basic data

Standard ID: GB/T 4324.1-2012 (GB/T4324.1-2012)
Description (Translated English): Methods for chemical analysis of tungsten -- Part 1: Determination of lead content -- Flame atomic absorption spectrometry
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H63
Classification of International Standard: 77.120.99
Word Count Estimation: 8,893
Older Standard (superseded by this standard): GB/T 4324.1-1984
Regulation (derived from): National Standards Bulletin No. 41 of 2012
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the tungsten powder, tungsten, tungsten carbide, tungsten trioxide, tungstic acid, tungsten blue, purple tungsten, ammonium paratungstate, metatungstate Determination of lead content. This section applies to tungsten powder, tungst

GB/T 4324.1-2012: Methods for chemical analysis of tungsten -- Part 1: Determination of lead content -- Flame atomic absorption spectrometry

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Methods for chemical analysis of tungsten.Part 1. Determination of lead content.Flame atomic absorption spectrometry ICS 77.120.99 H63 National Standards of People's Republic of China Replacing GB/T 4324.1-1984 Tungsten chemical analysis method Part 1. determination of lead content Flame atomic absorption spectrometry Part 1. Determination ofleadcontent- 2012-12-31 release 2013-10-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released

Foreword

GB/T 4324 "tungsten chemical analysis method" is divided into 28 parts. - Part 1. Determination of lead content - Flame atomic absorption spectrometric method; - Part 2. Determination of bismuth content - Hydride atomic absorption spectrometry; - Part 3. Determination of tin content - Hydride atomic absorption spectrometric method; - Part 4. Determination of antimony content - Hydride atomic absorption spectrometric method; - Part 5. Determination of arsenic content - Hydride atomic absorption spectrometry; - Part 6. Determination of iron content - o - phenanthroline spectrophotometric method; - Part 7. Determination of cobalt content - Inductively coupled plasma atomic emission spectrometry; - Part 8. Determination of nickel content - Inductively coupled plasma atomic emission spectrometry, flame atomic absorption spectrometry and butanedione oxime Weight method - Part 9. Determination of cadmium content - Inductively coupled plasma atomic emission spectrometry and flame atomic absorption spectrometry; - Part 10. Determination of copper content - Flame atomic absorption spectrometric method; - Part 11. Determination of aluminum content - Inductively coupled plasma atomic emission spectrometry; - Part 12. Determination of silicon content - Chloride - molybdenum blue spectrophotometric method; - Part 13. Determination of calcium content - Inductively coupled plasma atomic emission spectrometry; - Part 14. Determination of residual residue after chlorination - Weight method; - Part 15. Determination of magnesium content - Flame atomic absorption spectrometry and inductively coupled plasma atomic emission spectrometry; - Part 16. Determination of ignition loss - Weight method; - Part 17. Determination of sodium content - Flame atomic absorption spectrometric method; - Part 18. Determination of potassium content - Flame atomic absorption spectrometric method; - Part 19. Determination of titanium content - Diantipyrylmethane spectrophotometric method; - Part 20. Determination of vanadium content - Inductively coupled plasma atomic emission spectrometry; - Part 21. Determination of chromium content - Inductively coupled plasma atomic emission spectrometry; - Part 22. Determination of manganese content - Inductively coupled plasma atomic emission spectrometry; - Part 23. Determination of sulfur content - Combustion conductivity method and high - frequency combustion infrared absorption method; - Part 24. Determination of phosphorus content - Molybdenum blue spectrophotometric method; - Part 25. Determination of oxygen - Pulse heating inert gas melting - Infrared absorption method; - Part 26. Determination of nitrogen content - Pulse heating inert gas melting - thermal conductivity method and Nessler 's reagent spectrophotometric method; - Part 27. Determination of carbon content - High frequency combustion infrared absorption method; - Part 28. Determination of molybdenum content Thiocyanate spectrophotometric method. This part is part 1 of GB/T 4324. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part of the GB/T 4324.1-1984 "tungsten chemical analysis method square wave polarographic determination of lead and cadmium." This part with GB/T 4324.1-1984 compared to the main technical changes are as follows. The method of determination is changed from "square wave polarography" to "flame atomic absorption spectrometry"; --- the scope of application increased tungsten carbide, blue tungsten, purple tungsten and ammonium metatungstate; - change the "three times" in the "number of measurements" to "secondary". This part is the national nonferrous Metals Standardization Technical Committee (SAC/TC243). This part of the drafting unit. Zhuzhou Cemented Carbide Group Co., Ltd., Northwest Nonferrous Metals Research Institute, Western Metal Materials Co., Ltd. The main drafters of this part. Yi Jianbo, Zhang Ying, Sun Baolian, Zhou Kai, Li Tuo, Luo Xiaohong, Peng Yu, Yang Jianguo, Zhao Shengzhi This part of the previous version of the standard to replace the release of the situation. --- GB/T 4324.1-1984. Tungsten chemical analysis method Part 1. determination of lead content Flame atomic absorption spectrometry

1 Scope

This part of GB/T 4324 specifies tungsten powder, tungsten, tungsten carbide, tungsten trioxide, tungstic acid, blue tungsten, tungsten, ammonium paratungstate, ammonium metatungstate Determination of lead content in the method. This part is applicable to the determination of lead content in tungsten powder, tungsten, tungsten carbide, tungsten trioxide, tungstic acid, blue tungsten, purple tungsten, ammonium paratungstate and ammonium metatungstate set. The measurement range is 0.0003% ~ 0.0050%.

2 method summary

Tungsten powder, tungsten, fine, medium tungsten carbide decomposition with hydrogen peroxide; blue tungsten with hydrogen peroxide and sodium hydroxide decomposition; tungsten trioxide, tungstic acid, Ammonium tungstate, ammonium metatungstate with sodium hydroxide decomposition; purple tungsten, coarse particles of tungsten carbide oxidation of tungsten trioxide after decomposition with sodium hydroxide. In alkaline The solution was enriched with iron (Ⅲ) as a coprecipitant, the residual tungsten was complexed with citric acid, and the amount of lead was measured on an atomic absorption spectrometer.

3 reagent

Unless otherwise stated, the reagents used in this section are analytical reagents that conform to national standards or industry standards, and the water used is distilled water. 3.1 Hydrogen peroxide (ρ1.10g/mL), excellent grade pure. 3.2 sodium hydroxide solution (200g/L), with excellent grade pure reagent preparation. 3.3 high ammonium ferric sulfate solution (50g/L). 3.4 nitric acid (1 1). 3.5 citric acid solution (500g/L), with excellent grade pure reagent preparation. 3.6 Sodium hydroxide wash solution (1 g/L). 3.7 Lead standard solution. Weigh 0.1000g of metal lead (wPb ≥ 99.99%) in 250mL beaker, add 20mL nitric acid (3.4), cover The upper surface of the dish, low temperature heated to completely dissolved, remove and cool to room temperature, the solution into the 1000mL volumetric flask, diluted with water to the scale, mixed uniform. This solution 1mL containing 100μg of lead.

4 instruments

Atomic Absorption Spectrometer with Lead Hollow Cathode Lamp. In the best working conditions of the instrument, who can achieve the following indicators can be used. --- Characteristic concentration. In the solution consistent with the substrate of the measurement solution, the characteristic mass concentration of lead is not more than 0.3μg/mL; Precision. the maximum concentration of the standard solution measured 10 times the absorbance, the standard deviation should not exceed 1.0% of the average absorbance; The standard deviation should not exceed the maximum of 10 absorbance measured with the lowest concentration of the standard solution (not the "zero concentration" standard solution) Concentration Standard solution 0.5% of the average absorbance; --- Working curve linearity. the working curve according to the concentration is divided into five segments, the highest section of the difference between the absorbance difference and the lowest of the difference in absorbance Ratio, should not be less than 0.7. ......

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