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GB/T 4702.4-2008 English PDF

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US$189.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 4702.4-2008: Chromium metal -- Determination of iron content -- EDTA titrimetric method and flame atomic absorption spectrometric method
Status: Valid

GB/T 4702.4: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 4702.4-2008	189	Add to Cart	3 days	Chromium metal -- Determination of iron content -- EDTA titrimetric method and flame atomic absorption spectrometric method	Valid
GB/T 4702.4-1984	199	Add to Cart	2 days	Methods for chemical analysis of chromium metal--The EDTA volumetric method for the determination of iron content	Obsolete

Similar standards

GB/T 5686.2 GB/T 5686.4 GB/T 4336 GB/T 4702.6 GB/T 4702.7 GB/T 4702.3

Basic data

Standard ID: GB/T 4702.4-2008 (GB/T4702.4-2008)
Description (Translated English): Chromium metal -- Determination of iron content -- EDTA titrimetric method and flame atomic absorption spectrometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H11
Classification of International Standard: 77.100
Word Count Estimation: 8,838
Date of Issue: 2008-05-13
Date of Implementation: 2008-11-01
Older Standard (superseded by this standard): GB/T 4702.4-1984; GB/T 4702.7-1984
Quoted Standard: GB/T 4010
Regulation (derived from): National Standard Approval Announcement 2008 No.8 (Total No.121)
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 in iron content disodium edetate titration and flame atomic absorption spectrometry. This section applies to the determination of chromium in iron content. Measuring range (mass fraction): 0. 10% to 1. 00 %.

GB/T 4702.4-2008: Chromium metal -- Determination of iron content -- EDTA titrimetric method and flame atomic absorption spectrometric 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 metal. Determination of iron content. EDTA titrimetric method and flame atomic absorption spectrometric method ICS 77.100 H11 National Standards of People's Republic of China Replacing GB/T 4702.4-1984, GB/T 4702.7-1984 Determination of chromium iron content Disodium EDTA titration and Flame Atomic Absorption Spectrometry Posted 2008-05-13 2008-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This part is GB/T 4702.4-1984 "Methods for chemical analysis of chromium metal - The EDTA volumetric method for the determination of iron content" and GB/T 4702.7- 1984 "Methods for chemical analysis of chromium metal atomic absorption spectrophotometry of iron content," the integration of amendments. This Part replaces GB/T 4702.4-1984 and GB/T 4702.7-1984. This portion of the GB/T 4702.4-1984 and GB/T 4702.7-1984 comparison, the main changes are as follows. --- As hydrochloric acid, perchloric acid instead of perchloric acid decomposition sample; --- With ammonium chloride, hexamine in place of ammonia separation interference; --- Play with hydrochloric acid instead of sodium chloride in addition to residual chromium. This part is proposed by the China Iron and Steel Association. This section is under the jurisdiction of Metallurgical Industry Information Standards Institute. This section is drafted. Minmetals (Hunan) ferroalloy limited liability company. The main drafters of this section. Huang, Deng Zhihong, Lilong Long, Wang Yanrong, Peng strong again. This part of the standard replaces the previous editions are. --- GB/T 4702.4-1984; --- GB/T 4702.7-1984. Determination of chromium iron content Disodium EDTA titration and Flame Atomic Absorption Spectrometry Warning. Use of this section shall be a person experiences regular laboratory work. This section does not indicate that all possible security issues. Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.

1 Scope

This section provides disodium EDTA titration and flame atomic absorption spectrometric method for the determination of chromium in iron content. This section applies to the determination of chromium in iron content. Measurement range (mass fraction). 0.10% to 1.00%.

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 reference documents, the latest versions apply to this section. GB/T 4010 alloy chemical analysis and preparation of the sample Method 3 a. Titration disodium ethylenediaminetetraacetate 3.1 Principle Sample was dissolved with hydrochloric acid, perchloric acid smoke, made basic with ammonia to separate most of the chromium. Was dissolved in nitric hydroxide precipitate, add The smoke perchlorate, chromium acid to produce a chlorinated volatile chromium residue was treated with hydrochloric acid, water and dissolved salts, the pH is adjusted to sulfosalicylic acid as indicator. With disodium edetate titrate, according to the consumption of standard solution, the iron content calculated. 3.2 Reagents and materials Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled water or its equivalent purity water. 3.2.1 ammonium chloride as a solid. 3.2.2 ammonia, ρ0.90g/mL. 3.2.3 perchloric acid, ρ1.67g/mL. 3.2.4 nitrate, ρ1.42g/mL. 3.2.5 hydrochloric acid, ρ1.19g/mL. 3.2.6 hydrochloric acid, 1 + 1. 3.2.7 hydrochloric acid, 1 + 2. 3.2.8 hexamethylenetetramine solution, 250g/L. 3.2.9 hexamethylenetetramine solution, 5g/L. 3.2.10 sulfosalicylic acid solution, 50g/L. 3.2.11 ammonia buffer solution, pH10. Weigh 67.5g of ammonium chloride (3.2.1) dissolved in water, aqueous ammonia was added 570mL (3.2.2), washed with water Diluted to 1000mL, and mix. 3.2.12 iron standard solution, 0.1000mg/mL. 3.2.12.1 weighed 1.000g iron (more than 99.90%) were placed in 300mL beaker, add 30mL hydrochloric acid (3.2.7), thermal decomposition, ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 4702.4-2008_English be delivered?

Answer: Upon your order, we will start to translate GB/T 4702.4-2008_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 4702.4-2008_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 4702.4-2008_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.

Question 5: Should I purchase the latest version GB/T 4702.4-2008?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 4702.4-2008 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.