GB/T 4702.7-2016 English PDF

US$119.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 4702.7-2016: Chromium metal -- Determination of nitrogen content -- Distillation-nessler reagent spectrophotometric method
Status: Valid

GB/T 4702.7: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 4702.7-2016	119	Add to Cart	3 days	Chromium metal -- Determination of nitrogen content -- Distillation-nessler reagent spectrophotometric method	Valid
GB/T 4702.7-1984	239	Add to Cart	2 days	Methods for chemical analysis of chromium metal--The atomic absorption spectrophotometric method for the determination of iron content	Obsolete

Similar standards

GB/T 5686.2   GB/T 5686.4   GB/T 4336   GB/T 4702.3   GB/T 4702.6   GB/T 4702.15   

Basic data

Standard ID: GB/T 4702.7-2016 (GB/T4702.7-2016)
Description (Translated English): Chromium metal -- Determination of nitrogen content -- Distillation-nessler reagent spectrophotometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H11
Classification of International Standard: 77.100
Word Count Estimation: 6,698
Date of Issue: 2016-08-29
Date of Implementation: 2017-07-01
Regulation (derived from): National Standard Announcement 2016 No.14
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

GB/T 4702.7-2016: Chromium metal -- Determination of nitrogen content -- Distillation-nessler reagent spectrophotometric 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 nitrogen content - Distillation-nessler using spectrophotometric method ICS 77.100 H11 National Standards of People's Republic of China Determination of chromium content in metals Distillation Separation - Nessler Reagent Spectrophotometry Chromiummetal ─Determinationofnitrogencontent 2016-08-29 released 2017-07-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released

Foreword

GB/T 4702 is divided into 16 parts. - Part 1. Determination of chromium chromium content - Ammonium ferrous sulfate titration method Part 2. Determination of chromium content in metallic materials - Perchloric acid gravimetric method Part 3. Determination of chromium content in metals - Bismuth - phosphorus - molybdenum blue spectrophotometric method - Part 4. Determination of metallic chromium content - Ethylenediamine tetraacetic acid disodium titration and flame atomic absorption spectrometry - Part 5. Determination of metallic chromium content - Ethylenediamine tetraacetic acid disodium titration and flame atomic absorption spectrometry - Part 6. Determination of metallic ferrochromium, aluminum, silicon and copper content - Inductively coupled plasma atomic emission spectrometric method - Part 7. Determination of chromium content in metals - Distillation separation - Nessler reagent spectrophotometric method - Part 8. Methods for chemical analysis of chromium metal - Distillation - molybdenum blue spectrophotometric method for the determination of arsenic content Part 9. Methods for chemical analysis of metallic chromium - Determination of antimony content by crystal violet spectrophotometry - Part 10. Methods for chemical analysis of metallic chromium - The copper reagent spectrophotometric method for the determination of copper content - Part 11. Methods for chemical analysis of metallic chromium - Determination of tin content by alizarin violet spectrophotometry - Part 12. Determination of chromium, nitrogen and hydrogen content of metals - Inhalation of inert gases - Infrared absorption method and thermal conductivity method Part 13. Methods for chemical analysis of metallic chromium - The polarographic method for the determination of lead content - Part 14. Methods for chemical analysis of metallic chromium - The infrared absorption method for the determination of carbon content - Part 15. Determination of chromium, tin, bismuth, antimony and arsenic content of metallic chromium - Mass spectrometry - Part 16. Determination of chromium content in metals - Infrared absorption method and combustion neutralization titration method This part is part 7 of GB/T 4702. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part is made by China Iron and Steel Industry Association. This section is under the jurisdiction of the National Technical Committee on Standardization of Pig Iron and Ferroalloys (SAC/TC318). This part of the drafting unit. CITIC Jinzhou Metal Co., Ltd., Metallurgical Industry Information Standards Institute. The main drafters of this part. Jin Aidi, Yang Yuhong, Liu Kun, Chen Zibin, Lu Chunsheng. Determination of chromium content in metals Distillation Separation - Nessler Reagent Spectrophotometry WARNING - Personnel using this section should have practical experience in formal laboratory work. This section does not indicate all possible security questions It is the responsibility of the user to take appropriate safety and health measures and to ensure compliance with the conditions set forth in the relevant national regulations.

1 Scope

This part of GB/T 4702 specifies the determination of nitrogen content by distillation separation - Nessler reagent spectrophotometry. This part is applicable to the determination of nitrogen content in metal chromium, the determination range (mass fraction). 0.002% ~ 0.150%.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. GB/T 4010 Ferroalloy chemical analysis of the sample to take and preparation GB/T 6682 Analytical laboratory water specifications and test methods Metallurgical products - Chemical analysis - Spectrophotometric methods GB/T 12806 laboratory glass instrument single standard line capacity bottle GB/T 12807 Laboratory glass instruments - Index pipettes GB/T 12808 Laboratory glass instruments Single line pipettes

3 principle

The sample was dissolved in dilute sulfuric acid at low temperature to convert its converted nitrogen to ammonium salt. The cooled solution was transferred to a distillation flask and a certain amount of hydrogen Sodium oxide solution, through the water vapor, so that nitrogen in the form of ammonia to escape, dilute sulfuric acid solution absorption to Nessler reagent color, by spectrophotometry Measured its absorbance.

4 Reagents and Materials

Unless otherwise stated, only the confirmed analytical reagent is used in the analysis, and the water used is distilled or deionized or substantially pure water, Should comply with GB/T 6682 level water requirements. 4.1 sulfuric acid, 1 4, with the preparation. 4.2 sodium hydroxide solution, 500g/L (excellent grade pure). 4.3 sulfuric acid absorption solution, 1mL concentrated sulfuric acid dissolved in.2000mL water. 4.4 nitrogen standard solution 4.4.1 Weigh 0.3826g ammonium chloride (content of more than 99.9%, 105 ℃ ± 5 ℃ oven temperature 1h, cooled to room temperature), dissolved 100mL of water, into the 1000mL volumetric flask, diluted with water to the mark, mix, this solution 1mL containing 100.0μg nitrogen. 4.4.2 Remove the nitrogen standard solution (see 4.4.1) 50.0mL, placed in a 500mL volumetric flask, diluted with water to the mark, mix, this solution 1mL ......

Image     

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 4702.7-2016_English be delivered?

Answer: Upon your order, we will start to translate GB/T 4702.7-2016_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 4702.7-2016_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 4702.7-2016_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 4702.7-2016?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 4702.7-2016 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.