GB/T 7629-2008 English PDF

US$239.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 7629-2008: Determination of vitamin B2 in cereals
Status: Obsolete

GB/T 7629: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 7629-2008	239	Add to Cart	3 days	Determination of vitamin B2 in cereals	Obsolete
GB/T 7629-1987	199	Add to Cart	2 days	Method for the determination of vitamin B2 in cereals	Obsolete

Similar standards

GB 7718   GB/T 5532   GB 7718   GB/T 5534   

Basic data

Standard ID: GB/T 7629-2008 (GB/T7629-2008)
Description (Translated English): Determination of vitamin B2 in cereals
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: X04
Classification of International Standard: 67.060
Word Count Estimation: 6,648
Date of Issue: 2008-05-27
Date of Implementation: 2008-10-01
Older Standard (superseded by this standard): GB/T 7629-1987
Quoted Standard: GB 5491; GB/T 6682
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 fluorescence spectrophotometry cereals Vitamin B2 principle, reagents and materials, equipment, sample preparation, analysis step, calculated results and repeatability. This standard applies to the determination of vitamin B2 grains. This standard detection limit was 0. 06��g.

GB/T 7629-2008: Determination of vitamin B2 in cereals

---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.
Determination of vitamin B2 in cereals ICS 67.060 X04 National Standards of People's Republic of China Replacing GB/T 7629-1987 Determination of vitamin B2 in cereals Posted 2008-05-27 2008-10-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard reference AACCMethod86-70 "Riboflavin-FluorometricMethod" (2000, in English). This standard is GB/T 7629-1987 "Determination of cereal vitamin B2" amendments. This standard and GB/T 7629-1987 the main technical differences are as follows. --- Provides for sampling, and sample method; --- Hydrochloric acid extraction to extract; --- Adds a blank sample of high oxidation conditions specified; --- Cancel the dry basis measurement result of the requirements; --- Increased repeatability when measuring low levels of vitamin B2 grain requirements. The standard proposed by the National Food Authority. This standard by the National Standardization Technical Committee OILS. This standard was drafted. the National Food Authority feed grain Wuhan Quality Supervision and Inspection Center. The main drafters of this standard. Yang Lin, Qu Liwen, Liu Xiaomin, money Chuang, He Yifan. This standard replaces the standards previously issued as follows. --- GB/T 7629-1987. Determination of vitamin B2 in cereals

1 Scope

This standard specifies the fluorescence spectrophotometry principle grain vitamin B2, reagents and materials, equipment, sample preparation, Step analysis, the results of calculation and repeatability. This standard applies to the determination of grains of vitamin B2. The standard detection limit of 0.06μg.

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 5491 grain and oilseeds testing for sampling, and sample method GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-1992, neq ISO 3696. 1987) Principle 3 Vitamin B2 (riboflavin) fluorescence at 445nm excitation light in a certain concentration range of fluorescence intensity and the concentration of vitamin B2 It is proportional. Vitamin B2 extracted sample with sulfuric acid, reduction with sodium dithionite vitamin B2 generate non-fluorescent substance. The reduced The ratio of the difference between the internal standard vitamin B2 standard solution before and after the fluorescence intensity of the fluorescence intensity was calculated vitamin B2 content in the sample.

4 Reagents and materials

Unless otherwise specified, the reagents were of analytical grade, test water should be consistent with GB/T 6682 in the three water specifications. Amount of water was added 2.8mL of concentrated sulfuric acid, diluted to 1000mL. Weigh 340g of hydrated sodium acetate (CH3COONa · 3H2O) were dissolved in water and diluted to 1000mL. Weigh 4g potassium permanganate (KMnO4) was dissolved in water and diluted to 100mL, the preparation day use, stored in a brown reagent bottle. 4.4 Ba solution of hydrogen peroxide (H2O2) = 100 m1 L/L The amount of 10mL of hydrogen peroxide (H2O2,30%) diluted with water to 100mL, using now. 4.5 Vitamin B2 standard solution Vitamin B2 placed in a desiccator over phosphorus pentoxide desiccant placed 24h. Weigh accurately 50mg of vitamin B2 products fitted 1500mL water and 2.4mL of glacial acetic acid 2000mL flask, heating to fully dissolve, cooled and transferred to a flask with water to volume 2000mL, mix well and then transferred to a brown bottle, toluene dropping coverage, stored in a refrigerator (4 ℃) in. Imbibe 20mL vitamin B2 stock solution (Ⅰ) (4.5.1) was diluted with water volume to 50mL; stored in a refrigerator (4 ℃) in. Imbibe 10mL vitamin B2 standard stock solution (Ⅱ) (4.5.2) was diluted with water volume to 100mL, now with the current, protected from light. ......

Image     

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 7629-2008_English be delivered?

Answer: Upon your order, we will start to translate GB/T 7629-2008_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 7629-2008_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 7629-2008_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 7629-2008?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 7629-2008 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.