GB/T 21863-2008 English PDF

US$394.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 21863-2008: Gel permeation chromatography (GPC) -- Tetrahydrofuran as elution solvent
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21863-2008	394	Add to Cart	3 days	Gel permeation chromatography (GPC) -- Tetrahydrofuran as elution solvent	Valid

Similar standards

GB/T 21617   GB 23350   GB/T 21622   GB/T 21854   GB/T 21855   GB/T 21853   

Basic data

Standard ID: GB/T 21863-2008 (GB/T21863-2008)
Description (Translated English): Gel permeation chromatography (GPC) -- Tetrahydrofuran as elution solvent
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A80
Classification of International Standard: 13.300
Word Count Estimation: 20,248
Date of Issue: 2008-05-12
Date of Implementation: 2008-09-01
Quoted Standard: GB/T 3186-2006; GB/T 6379.1; GB/T 20777-2006; DIN 50014
Adopted Standard: DIN 55672-1-2007, IDT
Regulation (derived from): Announcement of Newly Approved National Standards 2008 No. 8 (No. 121 overall)
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 gel permeation chromatography in tetrahydrofuran, the molecular weight distribution of the dissolved polymer, the number average molecular weight Mn and the weight average molecular weight Mw of the methods and test conditions. If the sample/eluent/separation materials specific interaction occurring in the system, even a single chromatographic separation of the polymer obtained with good reproducibility and does not apply to this method. Gel permeation chromatography is a relative measurement method to use a commercially available linear, using an absolute method polystyrene standards of known molecular weight substances to be corrected. As a result, polymers having different structures can only be the same as the structure of the sample specimen set reference value. This standard does not apply to determination of Mw greater than 106g/mol polymers. This standard calibration method can not be implemented.

GB/T 21863-2008: Gel permeation chromatography (GPC) -- Tetrahydrofuran as elution solvent

---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.
Gel permeation chromatography (GPC). Tetrahydrofuran as elution solvent ICS 13.300 A80 National Standards of People's Republic of China Gel permeation chromatography (GPC) Tetrahydrofuran as eluent Posted 2008-05-12 2008-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is identical with the German Organization for Standardization DIN55672-1.2007 "gel permeation chromatography (GPC) - Part 1. tetrahydrocannabinol Furan (THF) as an elution solvent "(in German). The Standard Appendix A, Appendix C is a normative appendix, Appendix B is an informative annex. This standard is managed by the National Standardization Technical Committee chemicals dangerous (SAC/TC251) and focal points. This standard was drafted. China Inspection and Quarantine Science Research Institute, the Chemical Institute of Standardization. The main drafters of this standard. Yu Wen Lin, Falls Apart, Wang Junbing, Zhou Xin, Hao Nan, Mei Jian, Wang Xiaobing, Wang Lifeng, Sun Xin, Wang Zheng. This standard is the first release. Gel permeation chromatography (GPC) Tetrahydrofuran as eluent

1 Scope

This standard specifies the molecular weight distribution by gel permeation chromatography (GPC) measurement was dissolved in tetrahydrofuran (THF) in the polymer, the number average Molecular weight M shape and weight average molecular weight M methods and test conditions. If the sample/eluent/separation material system specific interactions (such as absorption), even if the individual polymer obtained chromatographed Away and there is good reproducibility of the method is not applicable. Gel permeation chromatography (GPC) is a method of measuring a relative, a commercially available linear needed, using methods known absolute molecular weight of polystyrene standards Substance corrected. As a result, the polymer samples having different structures can only be used as a reference value of the same structure as the sample group. This standard does not apply to determination of M is greater than 106g/mol of the polymer (see Appendix C). This standard correction method can not be implemented (such as the elimination peak diffusion). If you need to determine the absolute molar mass, you should use the absolute method (Example Such as. used to determine the M-shaped membrane osmotic pressure method, or M light scattering method).

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 3186-2006 Paints, varnishes and raw materials for paints and varnishes - Sampling (ISO 15528.2000, IDT) GB/T 6379.1 measurement methods and results of Accuracy (trueness and precision) - Part 1. General principles and definitions (GB/T 6379.1-2004, ISO 5725-1.1994, IDT) GB/T 20777-2006 Paints and varnishes examination and preparation of samples (ISO 1513.1992, IDT) DIN50014 climate and atmospheric pressure using standard techniques

3 Terms and Definitions

The following terms and definitions apply to this standard. 3.1 Gel permeation chromatography, is a special form of liquid chromatography, the polymer sample was dissolved in molecular dispersion in an eluent, based on the solute molecule Size fractionation volume, macromolecules elute first, followed by elution of small molecules, the molecular weight of the polymer was isolated according to the size. Elution volumes specified Under the test conditions are a function of a single polymer molecule. 4. Summary Sample was dissolved in eluent to prepare a sample solution to be tested (concentration of less than 5g/L), and the sample solution was injected into the divisible part GPC system. Eluent solute elutes from the column, the detector is continuously detected, which corresponds to a concentration usually consists of a differential refractive index detector test Amount, thereby obtaining the corresponding chromatograms using a calibration curve of the system is determined to calculate the relative molecular weight distribution, the number average molecular weight and the weight average M-shaped And a weight average molecular weight M number than M/M shape.

5 Test Equipment

5.1 General Gel permeation chromatography (GPC) instrument consists of the following parts (see Figure 1), these parts were described in detail hereinafter. ......

Image     

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 21863-2008_English be delivered?

Answer: Upon your order, we will start to translate GB/T 21863-2008_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 21863-2008_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 21863-2008_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.