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GB/T 22661.8-2008 English PDF

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US$139.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 22661.8-2008: Chemical analysis methods of potassium fluoborate -- Part 8: Determination of free borate content -- Sodium hydrogen titration volumetric method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 22661.8-2008	139	Add to Cart	3 days	Chemical analysis methods of potassium fluoborate -- Part 8: Determination of free borate content -- Sodium hydrogen titration volumetric method	Valid

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Basic data

Standard ID: GB/T 22661.8-2008 (GB/T22661.8-2008)
Description (Translated English): Chemical analysis methods of potassium fluoborate -- Part 8: Determination of free borate content -- Sodium hydrogen titration volumetric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H61
Classification of International Standard: 77.120.10
Word Count Estimation: 6,638
Date of Issue: 2008-12-29
Date of Implementation: 2009-11-01
Quoted Standard: GB/T 22661.1-2008
Regulation (derived from): National Standard Approval Announcement 2008 No.23 (Total No.136)
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 the determination of free boric acid and potassium fluoride acid content. This section applies to the determination of free boric acid content of boric acid and potassium fluoride. Measuring range: �� 1. 00%.

GB/T 22661.8-2008: Chemical analysis methods of potassium fluoborate -- Part 8: Determination of free borate content -- Sodium hydrogen titration 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 methods of potassium fluoborade Part 8. Determination of free borade content Sodium hydrogen titration volumetric method. ICS 77.120.10 H61 National Standards of People's Republic of China Chemical analysis methods of potassium fluoroborate Determination of free acid content. Part 8 Sodium hydroxide volumetric method Posted 2008-12-29 2009-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 22661 "potassium fluoroborate chemical analysis method" is divided into 10 parts. --- Part 1. Preparation and storage of test samples; --- Part 2. Determination of the weight of water in the wet method; --- Part 3. Determination of potassium fluoride boric acid sodium hydroxide volumetric method; --- Part 4. Determination of magnesium by flame atomic absorption spectrometry; --- Part 5. Determination of calcium content by flame atomic absorption spectrometry; --- Part 6. Determination of silicon content - Molybdenum blue spectrophotometric method; --- Part 7. Determination of sodium content by flame atomic absorption spectrometry; --- Part 8. Determination of the free boronic acid sodium volumetric method; --- Part 9. Determination of the chlorine content of mercuric nitrate volumetric method; --- Part 10. Determination of phosphorus pentoxide content - Molybdenum blue spectrophotometric method. This section GB/T 22661 Part 8. 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 drafted. Hunan Nonferrous fluorine chemical limited liability company. Participated in the drafting of this section. Fluoride Chemicals Co., Ltd., Zhengzhou Research Institute, Aluminum Corporation of China, Hengyang City State Friends Chemical Technology Co., Ltd. The main drafters of this section. Li Zhijian, Zhu Liang, Liao Zhihui, Li Yongqiang, Wang Hui, Chen Chun, Feng Jingdong, Liu Zhihong Huang Ju in particular, Liu Min. Chemical analysis methods of potassium fluoroborate Determination of free acid content. Part 8 Sodium hydroxide volumetric method

1 Scope

This section GB/T 22661 specifies the method for determination of potassium fluoroborate free boric acid content. This section applies to the determination of free boric acid content of potassium fluoroborate. Measuring range. ≤1.00%.

2 Normative references

The following documents contain provisions which, through reference GB/T 22661 in this section constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section. GB/T 22661.1-2008 Chemical analysis methods of potassium fluoroborate Part 1. Preparation and storage of test samples

3 Method summary

Reinforcing mannitol boronic acid, using phenolphthalein as indicator, titrated with standard sodium hydroxide droplets given.

4 Reagents

4.1 methyl red - bromocresol green mixed indicator. a methyl red ethanol solution (2g/L) and three bromocresol green ethanol solution (1g/L) mixing. 4.2 phenolphthalein indicator. 10g/L. 4.3 mannitol. AR. 4.4 sodium hydroxide standard titration solution. Ba (NaOH) = 0.1mol/L. Preparation of standard stock solution of sodium hydroxide 4.4.1 Weigh 2020g sodium hydroxide solution was 10L carbon dioxide-free pure water, stored in plexiglass bottle. Depending sodium carbonate Low sodium content, add two barium chloride (estimate each containing 1g of sodium carbonate plus 5g two barium chloride) was allowed to stand for several hours, so that barium carbonate precipitation was complete. Pipette the supernatant, add appropriate amount of sodium sulfate, after mixing overnight. 1L solution of sodium hydroxide containing about 5mol, whichever supernatant using or filter. 4.4.2 preparation of sodium hydroxide solution Pipette 200mL sodium hydroxide standard stock solution (4.4.1) in plexiglass flask, add carbon dioxide-free pure water will dilute 10L, mixing, Place the next calibration. 4.4.3 Calibration Weigh 0.5105g of potassium hydrogen phthalate reference reagent (at 110 ℃ ± 5 ℃ drying 2h ~ 3h, cooled to room temperature in a desiccator) to 250mL flask, add carbon dioxide-free water 80mL, heated to dissolve, add 1 drop of methyl orange indicator, with sodium hydroxide solution For calibration Droplet to the solution as a yellow end point mutation. 4.4.4 the actual concentration of sodium hydroxide standard titration solution (Ba) according to formula (1). Ba = m1 Vp × 0.2042 (1) ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 22661.8-2008_English be delivered?

Answer: Upon your order, we will start to translate GB/T 22661.8-2008_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 22661.8-2008_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 22661.8-2008_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.