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Chlorinated methane for industrial use -- Determination of purity -- Gas chromatography
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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 | 11,15 |
| 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
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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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