GB/T 23513.4-2009 English PDF

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GB/T 23513.4-2009: Chemical analysis methods for germanium concentrate -- Part 4: Determination of fluoride content -- ISE
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Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 23513.4-2009	139	Add to Cart	3 days	Chemical analysis methods for germanium concentrate -- Part 4: Determination of fluoride content -- ISE	Valid

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Basic data

Standard ID: GB/T 23513.4-2009 (GB/T23513.4-2009)
Description (Translated English): Chemical analysis methods for germanium concentrate -- Part 4: Determination of fluoride content -- ISE
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H66
Classification of International Standard: 77.120.99
Word Count Estimation: 6,683
Date of Issue: 2009-04-08
Date of Implementation: 2010-02-01
Regulation (derived from): National Standard Approval Announcement 2009 No.4 (Total No.144)
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 determination of germanium concentrate fluorine content. This section applies to the determination of germanium concentrate fluorine content. Measuring range: 0. 01 to 1. 0%.

GB/T 23513.4-2009: Chemical analysis methods for germanium concentrate -- Part 4: Determination of fluoride content -- ISE

---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.
Chemical analysis methods for germanium concentrate Part 4. Determination of fluoride content ISE. ICS 77.120.99 H66 National Standards of People's Republic of China Chemical analysis methods for germanium concentrate Part 4. Determination of the amount of fluorine Ion Selective Electrode Posted 2009-04-08 2010-02-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 23513 "Chemical analysis methods for germanium concentrate" is divided into five parts. --- Part 1. Determination of germanium content of potassium iodate titration; --- Part 2. Determination of arsenic content ammonium ferrous sulfate titration; --- Part 3. Determination of sulfur content of barium sulfate gravimetric method; --- Part 4. Determination of the amount of fluorine ion selective electrode method; --- Part 5. silicon dioxide content - Gravimetric method. This is Part 4. 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 responsible for drafting unit. Yunnan Lincang Xinyuan Germanium Industry Co., Ltd. Participated in the drafting of this section. Lingnan Shaoguan smelter, Huaihua City, Hong Jiang Hengchang Germanium Co., Ltd., Nanjing Germanium Factory limited liability Any company, Beijing State Technology Co., Ltd. crystal-infrared optics. The main drafters of this section. East Bowen, Li Hecheng, universal Kun, Zheng Hong, high Meng Ming, Sun Yan. Chemical analysis methods for germanium concentrate Part 4. Determination of the amount of fluorine Ion Selective Electrode

1 Scope

GB/T 23513 provisions of this part of the determination of germanium concentrate fluorine content. This section applies to the determination of germanium concentrate fluorine content. Measuring range. 0.01% to 1.0%.

2 principle of the method

Sample melted with sodium hydroxide, water extraction and separation of most of the metal ions, sodium citrate at a pH of about 6.5 buffer medium, Fluorine ion selective electrode as indicator electrode, a saturated calomel electrode as the reference electrode, measuring the potential difference between the solution in the determination of fluorine ion meter.

3 Reagents

Unless otherwise stated, only confirmed in the analysis of analytical grade reagents and distilled water or equivalent purity. 3.1 Sodium peroxide (Na2O2). 3.2 Sodium hydroxide (NaOH). Nitrate 3.3 (ρ1.42g/mL). 3.4 absolute ethanol (CH3CH2OH). 3.5 nitric acid (1 + 1). 3.6 sodium citrate buffer solution [Ba (Na3C6H5O7 · 2H2O) = 1mol/L]. 294g sodium citrate were dissolved in 900mL of water, plus 10mL of nitric acid (3.3), add water to 1000mL, pH of about 6.5. 3.7 fluoro standard stock solution. Weigh 2.2100g advance at 105 ℃ excellent pure sodium sulfate 2h time, placed in a plastic cup, add water Dissolved and transferred to 1000mL volumetric flask, immediately constant volume of water, and mix. Move quickly into dry plastic bottle preservation, this solution of fluorine 1mg/mL. 3.8 fluoro standard solution A. Pipette 20.00mL fluoro standard stock solution in 200mL volumetric flask with water to volume, and mix. Into dry Plastic bottle, a fluorine-containing solution was 100μg/mL. 3.9 fluoro standard solution B. Pipette 10.00mL fluoro standard solution in 100mL flask with water to volume, and mix. Into dry plastic Bottle, the solution of fluorine 10.00μg/mL.

4 Instrument

4.1 Nickel Crucible, with cover, 30mL. 4.2 ion meter or pH, mV readings to 1/10mV. 4.3 FISE. 4.4 saturated calomel electrode. 4.5 polyethylene beaker.200mL, 50mL. 4.6 plastic flask.200mL, 100mL, 50mL. 4.7 magnetic stirrer. a stirring rod coated with polyethylene. 4.8 plastic funnel. ......

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