GB/T 23368.2-2009 English PDF

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GB/T 23368.2-2009: Methods for chemical analysis of ammonium metatungstate -- Part 2: Determination of zinc content -- Flame atomic absorption spectrometry
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 23368.2-2009	139	Add to Cart	3 days	Methods for chemical analysis of ammonium metatungstate -- Part 2: Determination of zinc content -- Flame atomic absorption spectrometry	Valid

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Basic data

Standard ID: GB/T 23368.2-2009 (GB/T23368.2-2009)
Description (Translated English): Methods for chemical analysis of ammonium metatungstate -- Part 2: Determination of zinc 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: 6,65
Date of Issue: 2009-03-19
Date of Implementation: 2010-01-01
Regulation (derived from): National Standard Approval Announcement 2009 No.3 (Total No.143)
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 method for measuring the amount of tungsten, zinc ammonium bias. This section applies to partial determination of the amount of zinc ammonium tungstate. Measurement range of 0. 0003% to 0. 020 %.

GB/T 23368.2-2009: Methods for chemical analysis of ammonium metatungstate -- Part 2: Determination of zinc 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 ammonium metatungstate.Part 2. Determination of zinc content.Flame atomic absorption spectrometry ICS 77.120.99 H63 National Standards of People's Republic of China Chemical analysis of ammonium paratungstate Part 2. Determination of zinc contents Flame Atomic Absorption Spectrometry Posted 2009-03-19 2010-01-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 23368 "partial ammonium tungsten chemical analysis methods" is divided into two parts. --- Part 1. Determination of the amount of water insoluble weighing method; --- Part 2. Determination of zinc content - Flame atomic absorption spectrometric method. This is Part 2. This part is proposed by the China Nonferrous Metals Industry Association. The non-ferrous metal part by the National Standardization Technical Committee. This section is Ganzhou Huaxing Tungsten Products Co., Ltd., China Nonferrous Metals Industry Institute of Standards Metrology and Quality is responsible for drafting. This section is Chongyi Zhangyuan Tungsten Co., Ltd., Ganzhou Nonferrous Metallurgy Research Institute participated in the drafting. The main drafters of this section. Zhang Qian, Wang Changji, Huang new Gewei Hong, Wei Ling, Li Ping, Pan Jianzhong, Zhongdao Guo. Chemical analysis of ammonium paratungstate Part 2. Determination of zinc contents Flame Atomic Absorption Spectrometry

1 Scope

This section GB/T 23368 specifies the determination of the amount of zinc ammonium tungstate bias. This section applies to the determination of ammonium tungstate partial zinc content was measured in the range of 0.0003% to 0.020%.

2 Method summary

After the sample was decomposed by ammonia, citric acid complex tungsten, atomic absorption spectrometry determination of zinc content at 213.9nm by standard addition method.

3 Reagents

3.1 Ammonia (ρ0.90g/mL), pure class distinctions. 3.2 citric acid solution (500g/L). 3.3 HCl (1 + 1). 3.4 hydrochloric acid (1 + 19). 3.5 standard zinc stock solution. Weigh 0.1000g metallic zinc [(Zn) ≥99.99%] in 250mL beaker, add 20mL hydrochloric acid (3.3) low heat to dissolve and remove cooling. Moved into 1000mL volumetric flask with hydrochloric acid (3.4) diluted to the mark, and mix. This solution 1mL containing 100μg zinc. 3.6 Zinc standard solution. Pipette 10.00mL standard zinc stock solution (3.5) into 100mL volumetric flask, dilute to the mark with hydrochloric acid (3.4) Degree, and mix. This solution 1mL containing 10μg zinc.

4 Instrument

Atomic absorption spectrometer, with zinc hollow cathode lamp. Under optimum working conditions for those who can reach the following indicators can be used. --- Characteristic concentration. In line with the measuring solution matrix solution, characterized in zinc concentration should not exceed 0.0041μg/mL; --- Precision. standard solution with the highest concentration of 10 times the absorbance measurements, the standard deviation should not exceed 1.5% of the average absorbance; With the lowest concentration of standard solution (not "zero" concentration of the standard) measuring the absorbance of 10 times, the standard deviation should not exceed the maximum The average concentration of 0.5% absorbance; --- Linear curve. The curve is divided into five sections according to concentration, absorbance difference between the absorbance difference between the highest and the lowest segment of the segment Ratio should not be less than 0.7.

5 Sample

Ammonium paratungstate samples do not need special treatment, it can be directly used for analysis. Step 6 Analysis 6.1 Sample Table 1. Weigh the sample to the nearest 0.0001g. ......

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