GB/T 21994.4-2008 English PDF

US$139.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 21994.4-2008: Chemical analysis of magnesium fluoride -- Part 4: Determination of magnesium -- EDTA volumetric method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21994.4-2008	139	Add to Cart	3 days	Chemical analysis of magnesium fluoride -- Part 4: Determination of magnesium -- EDTA volumetric method	Valid

Similar standards

GB/T 20975.29   GB/T 20975.28   GB/T 20975.30   GB/T 21994.3   GB/T 21994.5   GB/T 21994.2   

Basic data

Standard ID: GB/T 21994.4-2008 (GB/T21994.4-2008)
Description (Translated English): Chemical analysis of magnesium fluoride -- Part 4: Determination of magnesium -- EDTA volumetric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H12
Classification of International Standard: 77.040.30
Word Count Estimation: 6,617
Date of Issue: 2008-06-09
Date of Implementation: 2008-12-01
Quoted Standard: GB/T 21994.1-2008
Regulation (derived from): National Standard Approval Announcement 2008 No.9 (Total No.122)
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 the amount of magnesium in magnesium fluoride. This section applies to the determination of magnesium fluoride, magnesium content. Measuring range: 25% to 40%.

GB/T 21994.4-2008: Chemical analysis of magnesium fluoride -- Part 4: Determination of magnesium -- EDTA volumetric method

---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 of magnesium fluoride Part 4. Determination of magnesium EDTA volumetric method ICS 77.040.30 H12 National Standards of People's Republic of China Chemical analysis of magnesium fluoride Determination of magnesium content. Part 4 EDTA volumetric method Posted 2008-06-09 2008-12-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 21994 "Chemical analysis of magnesium fluoride" is divided into eight sections. --- Part 1. Preparation and storage of test samples; --- Part 2. Determination of the weight of water in the wet method; --- Part 3. Determination of distillation of fluorine content - thorium nitrate volumetric method; --- Part 4. Determination of magnesium content - EDTA volumetric method; --- Part 5. Determination of calcium content by flame atomic absorption spectrometry; --- Part 6. Determination of silicon dioxide content - Molybdenum blue spectrophotometric method; --- Part 7. Determination of iron oxide content phenanthroline spectrophotometry; --- Part 8. Determination of sulfate content of barium sulfate 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 Hunan Nonferrous fluorine chemical limited liability company, China Nonferrous Metals Industry Institute of Standards Metrology and Quality is responsible for drafting. This section is drafted. Hunan Nonferrous fluorine chemical limited liability company. Participated in the drafting of this section. Fluoride Chemicals Co., Ltd., Silver fluoride limited liability company. The main drafters of this section. Li Zhijian, Liao Zhihui, Chen Xiang Yu, Zhu Liang, Xu Jin Xue, Wang Jianping, Guo Xianhui, Bo, Li Ye. Chemical analysis of magnesium fluoride Determination of magnesium content. Part 4 EDTA volumetric method

1 Scope

This section provides the determination of the amount of magnesium in the magnesium fluoride. This section applies to the determination of magnesium fluoride, magnesium content. Measuring range. 25% to 40%.

2 Normative references

The following documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to this part of the research agreement Whether the latest versions of these documents. For undated references, the latest edition to adapt to this section. GB/T 21994.1-2008 Chemical analysis of magnesium fluoride - Part 1. Sample Preparation and Storage

3 Method summary

Sample with hydrofluoric acid, sulfuric acid decomposition, acidic chrome blue K- naphthol green B as indicator, titrated with EDTA solution.

4 Reagents

4.1 Hydrofluoric acid (40%). 4.2 sulfate (1 + 1). 4.3 hydrochloride (3mol/L). 4.4 methyl orange indicator (1g/L). Ammonia 4.5 (1 + 1). 4.6 ammonium chloride washing solution. Weigh 1g of ammonium chloride dissolved in 500mL of water, add 2 drops of methyl orange indicator, with ammonia (1 + 1) and Adjusted hydrochloric acid (3mol/L) just yellow, and 2 drops of excess. 4.7 nitric acid (1 + 1). Triethanolamine 4.8 (1 + 2). 4.9 ammonia buffer solution (pH = 10). Weigh 67.5g of ammonium chloride was dissolved in 200mL of water, 510mL of concentrated aqueous ammonia was added, diluted to 1000mL, mix, sealed. 4.10 calcium indicator. Weigh 1g and 10g anhydrous sodium sulfate and calcium indicator put an agate mortar and grind evenly, put the dryer saved. 4.11 Magnesium indicator. Weigh acid chrome blue K0.1144g, naphthol green B0.2856g, was dissolved in 100mL of water, stored in a brown bottle spare. 4.12 xylenol orange indicator (1g/L). Weigh 0.1000g xylenol orange indicator directly dissolved in 100mL of water, stored in a 150mL brown dropper bottle aside. 4.13 HCl (1 + 1). 4.14 of potassium hydroxide. 4.15 potassium hydroxide solution (200g/L). 4.16 acetic acid - sodium acetate buffer solution pH = (5.5 ~ 6). Weigh 120.5g anhydrous sodium acetate is dissolved in water, was added 10mL of glacial acetic Dilute acid, add water to 1000mL, mixing spare. ......

Image     

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 21994.4-2008_English be delivered?

Answer: Upon your order, we will start to translate GB/T 21994.4-2008_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 21994.4-2008_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 21994.4-2008_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.