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GB/T 24227-2009 English PDF

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US$209.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 24227-2009: Chromium ores and concentrates -- Determination of silicon content -- Spectrophotometric method and gravimetric method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 24227-2009	209	Add to Cart	3 days	Chromium ores and concentrates -- Determination of silicon content -- Spectrophotometric method and gravimetric method	Valid

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Basic data

Standard ID: GB/T 24227-2009 (GB/T24227-2009)
Description (Translated English): Chromium ores and concentrates -- Determination of silicon content -- Spectrophotometric method and gravimetric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D33
Classification of International Standard: 73.060.30
Word Count Estimation: 9,983
Date of Issue: 2009-07-15
Date of Implementation: 2010-04-01
Adopted Standard: ISO 5997-1984, MOD
Regulation (derived from): National Standard Approval Announcement 2009 No.9 (Total No.149)
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 Chromium ores and concentrates silicon content spectrophotometry and gravimetric method. This standard applies to chrome ore and chrome ore shoot most of the determination of silicon -containing. Measuring range (mass fraction): 0. 05% -0. 5 % spectrophotometry, gravimetric method 0. 5% -15. 0 %, this standard shall comply with the relevant provisions of GB/T 24228 's.

GB/T 24227-2009: Chromium ores and concentrates -- Determination of silicon content -- Spectrophotometric method and gravimetric 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.
Chromium ores and concentrates. Determination of silicon content. Spectrophotometric method and gravimetric method ICS 73.060.30 D33 National Standards of People's Republic of China Determination of Chromium ores and concentrates silicon content Spectrophotometric and gravimetric method (ISO 5997. 1984Chromiumoresandconcentrates- spectrometricmethodandgravimetricmethod, MOD) Posted 2009-07-15 2010-04-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This revised standard adopts ISO 5997. 1984 "chrome ore and chrome ore silicon content determination of molecular absorption spectrometric method and gravimetric method." (In English). This standard and ISO 5997. 1984 as compared to, mainly to do the following changes. --- "2 Normative references" in place of national standards with international standards corresponding; --- 3.2.6.2 in the "Silicon standard solution" by the ISO 5997. 1984's "1mL of the standard solution containing silicon 0.0050mg" revised The standard "1mL of the standard solution containing silicon 0.0025mg"; --- Added "3.4 Sampling and sample preparation"; --- Added "3.5.1 Determination of times"; --- Added "4.4 Sampling and sample preparation"; --- Added "4.5.1 Determination of times"; --- Added "5 test report." The standard proposed by China Iron and Steel Association. This standard by the National Standardization Technical Committee of pig iron and ferroalloy. This standard was drafted. Tianjin People's Republic of China Exit Inspection and Quarantine, metallurgical industry Information Standards Institute, Ningbo Inspection and Phytophthora Institute of Science and Technology. The main drafters of this standard. Wei Hongbing, Gu Songhai, Wang Haoyun, Li Anmin, Feng Yuxin, Yangli Fei, Zhu Xiaoyan, Chen Zibin. Determination of Chromium ores and concentrates silicon content Spectrophotometric and gravimetric method Warning --- personnel should use this standard regular laboratory work experience. This standard does not point out all possible security asked question. Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant state laws and regulations.

1 Scope

This standard specifies the determination of Chromium ores and concentrates silicon content gravimetric method and spectrophotometry. This standard applies to the determination of Chromium ores and concentrates silicon content. Measurement range (mass fraction). 0.05% ~ spectrophotometry 0.5%; 0.5% by weight of law to 15.0%, this standard shall comply with the relevant provisions of GB/T 24228 of.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD) GB/T 12806 Laboratory glassware single marking flask (GB/T 12806-1991, eqvISO 1042. 1983) GB/T 12808 standard laboratory glassware single line pipette (GB/T 12808-1991, eqvISO 648. 1977) GB/T 24228 Chromium ores and concentrates - General method (GB/T 24228-2009, ISO 6629. 1981, MOD) GB/T 24220 chrome ore samples were analyzed for moisture intrudes Gravimetric method (GB/T 24220-2009, ISO 6129. 1981, MOD) GB/T 24243 chrome ore samples taken parts (GB/T 24243-2009, ISO 6153. 1989, IDT) ISO 6154 chrome ore sample preparation

3 spectrophotometry

3.1 Principle Sample decomposition with mixed flux to the flooding melt. Adjusting the pH of the solution with hydrochloric acid, in the presence of citric acid, ammonium molybdate and silica Reaction of silicon molybdate yellow heteropoly acid, ascorbic acid be reduced to the blue silicon molybdate complex. Generated by spectrophotometer Complex photometric measurements. 3.2 Reagents Unless otherwise stated, use only reagents of recognized analytical grade and distilled water or equivalent purity of its water, in line with the provisions of GB/T 6682's. 3.2.1 mixed flux, take 100g of anhydrous sodium carbonate, 50g sodium tetraborate (pre-ignition to no foaming) and 0.5g of potassium nitrate in corundum or hard Finely ground steel in a mortar mix. 3.2.2 hydrochloric acid, ρ1.19g/mL. 3.2.3 hydrochloric acid, 1 + 3. 3.2.4 mixed acid, 5g of citric acid and 1g of ascorbic acid dissolved in 100mL of water. Formulated with time. 3.2.5 ammonium molybdate solution, 50g/L. Ammonium molybdate solution is prepared by recrystallization, quartz, or stored in a polyethylene container. When recrystallization, the ammonium molybdate was dissolved in 250g 400mL water, heated to 70 ℃ ~ 80 ℃, filtered with filter paper slowly cooled to room temperature. 300mL distillation of ethanol was added under stirring, ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 24227-2009_English be delivered?

Answer: Upon your order, we will start to translate GB/T 24227-2009_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 24227-2009_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 24227-2009_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.