GB/T 21541-2008 English PDF

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GB/T 21541-2008: Chlorinated methane for industrial use -- Determination of purity -- Gas chromatography
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21541-2008	259	Add to Cart	3 days	Chlorinated methane for industrial use -- Determination of purity -- Gas chromatography	Valid

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Basic data

Standard ID: GB/T 21541-2008 (GB/T21541-2008)
Description (Translated English): Chlorinated methane for industrial use -- Determination of purity -- Gas chromatography
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G16
Classification of International Standard: 71.080.20
Word Count Estimation: 11,179
Date of Issue: 2008-04-01
Date of Implementation: 2008-09-01
Quoted Standard: GB/T 9722-2006
Regulation (derived from): National Standard Approval Announcement 2008 No.5 (Total No.118)
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 provides industry with methylene chloride, chloroform, experimental methods CTC component measured. Determination of carbon tetrachloride and impurity content, This standard does not apply to cyclopentene industry as a stabilizer with methylene chloride, chloroform.

GB/T 21541-2008: Chlorinated methane for industrial use -- Determination of purity -- Gas chromatography

---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.
Chlorinated methanes for industrial use. Determination of purity. Gas chromatography ICS 71.080.20 G16 National Standards of People's Republic of China Determination of chlorinated methane product purity for industrial use Gas chromatography Posted 2008-04-01 2008-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

Appendix A of this standard is a normative appendix. Appendix B of this standard is an informative annex. The standard proposed by China Petroleum and Chemical Industry Association. This standard by the National Standardization Technical Committee branch of organic chemistry (SAC/TC63/SC2) centralized. This standard was drafted. Zhejiang Quzhou of fluorine chemistry Co., national fluoride materials engineering and technology research center. The main drafters of this standard. Liu Hongxiu, Chenke Feng, Tang Yueming, Zhang, Wuzhou An, Zhong Jun, Mi Hong, Chen Caiqin, Tanxian Wen. This standard is the first release. Determination of chlorinated methane product purity for industrial use Gas chromatography

1 Scope

This standard specifies the test industry with dichloromethane (CH2Cl2), chloroform (CHCl3), carbon tetrachloride (CCl4) component measured method. This standard applies not cyclopentene as a stabilizer industrial dichloromethane (CH2Cl2), chloroform (CHCl3), Carbon tetrachloride (CCl4) and determination of impurity content.

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 9722-2006 General chemical reagent gas chromatography

3 Method summary

Under the selected chromatographic operating conditions, after chlorinated methane vaporized sample through the column, so that the various components measured want to separate from the flame Ionization detector to calculate the corrected area normalization method, net of sample water to give chlorinated methane product purity quality scores.

4 Reagents and materials

4.1 Nitrogen. purity of greater than 99.8% volume fraction; 4.2 Hydrogen. volume fraction purity greater than 99.8%; 4.3 Air. silica gel and molecular sieve drying, purification; 4.4 dichloromethane. purity mass fraction ≥99.9%, as a calibration standard sample background; 4.5 chloroform. purity mass fraction ≥99.9%, as a calibration standard sample background; 4.6 CTC. purity mass fraction ≥99.9%, as a calibration standard sample background; Each impurity components 4.7 calibration standard sample. purity or quality chromatography fraction ≥99.5%.

5 Instruments

5.1 Gas chromatograph. with a flame ionization detector (FID), capillary column may be analyzed. In line with GB/T 9722-2006 Chromatographic conditions specified in 6.4.2 to benzene as a sample, the detection limit D≤5 × 10-10g/s; 5.2 Recorder. chromatography workstation or processor; 5.3 Injector. micro syringe 1μL, or autosampler; 5.4 with a septum screw top bottle. 100mL.

6 chromatography conditions

Recommended chromatographic columns and operating conditions are shown in Table 1. A typical chromatogram chlorinated methane and relative retention times given in Appendix A. other You can achieve the same degree of separation columns and chromatographic operating conditions can be used. ......

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