Powered by Google-Search & Google-Books Chinese Standards Shop Database: 169759 (Nov 17, 2019)
 HOME   Quotation   Tax   Examples Standard-List   Contact-Us   View-Cart
  

SN/T 4148-2015

Chinese Standard: 'SN/T 4148-2015'
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusRelated Standard
SN/T 4148-2015English170 Add to Cart 0--15 minutes. Auto immediate delivery. Determinaiton of volatile organic compounds(VOCs) in packing materials. Static headspace gas chromatography Valid SN/T 4148-2015
SN/T 4148-2015Chinese18 Add to Cart <=1-day [PDF from Chinese Authority, or Standard Committee, or Publishing House]

 SN/T 4148-2015 -- Click to view the ACTUAL PDF of this standard (Auto-delivered in 0~10 minutes) In 0~10 minutes time, full copy of this English-PDF will be auto-immediately delivered to your email. See samples for translation quality.  
Detail Information of SN/T 4148-2015; SN/T4148-2015
Description (Translated English): Determinaiton of volatile organic compounds(VOCs) in packing materials. Static headspace gas chromatography
Sector / Industry: Commodity Inspection Standard (Recommended)
Classification of Chinese Standard: A82
Classification of International Standard: 55.040
Word Count Estimation: 11,183
Date of Issue: 2015-02-09
Date of Implementation: 2015-09-01
Quoted Standard: GB/T 6682
Drafting Organization: People's Republic of China Shanghai Exit Inspection and Quarantine
Administrative Organization: Certification and Accreditation Administration of the People Republic of China
Regulation (derived from): State-Quality-Inspection-Accreditation [2015] 59
Proposing organization: Certification and Accreditation Administration of the People's Republic of China
Issuing agency(ies): Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Summary: This standard specifies a static headspace packaging materials Volatile Organic Compounds (VOCs) - A gas chromatographic method. This standard applies to the determination of volatile organic compounds known in the chemical composition of packaging materials, packaging materials within the volatile thermal degradation of organic matter not covered by this standard measurement range.

SN/T 4148-2015
SN
ENTRY-EXIT INSPECTION AND QUARANTINE
INDUSTRY STANDARD OF PRC
Determination of volatile organic compounds (VOCs)
in packing materials – Static headspace gas
chromatography
包装材料中挥发性有机物(VOCs)的测定
静态顶空-气相色谱法
ISSUED ON. FEBRUARY 09, 2015
IMPLEMENTED ON. SEPTEMBER 01, 2015
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC
Table of contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Principle ... 5 
5 Reagents and materials ... 5 
6 Devices ... 7 
7 Sample preparation and storage ... 9 
8 Analysis steps ... 10 
9 Precision ... 13 
APPENDIX A (Informative) Typical headspace-gas chromatographic conditions
... 15 
APPENDIX B (Normative) Standard addition method ... 17 
Appendix C (Informative) Examples of volatile organic compounds
chromatogram in styrene polymer package ... 19 
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by AND shall be under the jurisdiction of the
National Certification and Accreditation Administration.
The drafting organizations of this standard. Shanghai Entry-exit Inspection and
Quarantine Bureau of the People's Republic of China.
The main drafters of this standard. Cheng Yuxiao, Li Hongtao, Ma Ming, Qiang
Yin, Zhou Yuyan.
Determination of volatile organic compounds (VOCs)
in packing materials – Static headspace gas
chromatography
1 Scope
This standard specifies the method for the measurement of volatile organic
compounds (VOCs) in packing materials through the static headspace gas
chromatography.
This standard is applicable to the measurement of volatile organic compounds
of the known chemical compositions in in packing materials; however, the
volatile organic compounds as generated due to the thermal degradation of
packing materials are not covered by the measurement scope of this standard.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 6682 Water for analytical laboratory use – Specification and tests
methods
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Packaging materials
It is the general term of the materials that are used to manufacture the
packaging containers AND constitute the packaging of the packed product.
3.2
Polymer packaging
immediately with water, OR otherwise seek treatment immediately if
serious. The volatile substances such as vinyl chloride and acrylonitrile
shall not be released into the laboratory air. It shall prepare and treat the
standard sample in a well-ventilated fume hood.
The reagents and water used in this standard are, unless otherwise noted or
required, analytical pure reagents and class III water as specified in GB/T 6682.
5.1 Methanol
5.2 Solvents. it is used to dissolve the polymer, AND it shall not contain any
interference which has the same retention time as that of the volatile component
to be measured. Typical polymer solvents include.
a) Dimethylformamide (DMF);
b) Dimethylacetamide (DMAC);
c) Propylene carbonate;
d) O-dichlorobenzene.
Note. The volatile contaminants in the solvent can be removed through an inert
gas purging for 24 h ~ 48 h.
5.3 Diluent. it is used to dilute and prepare the standard working solution of
volatile organic compounds, its retention time in the gas chromatography shall
be inconsistent with that of the substance to be measured, AND the commonly
used diluent includes.
a) Water;
b) n-Hexadecane.
5.4 Volatile organic standard sample. the highest concentrations available for
commercial analysis of volatile organic compounds by this method. Examples
of volatile organic compounds that may be present in the styrene polymer
package are as follows.
a) Styrene;
b) Acrylonitrile.
c) Butadiene;
d) Benzene;
Note. Suitable detectors include the following detectors.
a) Flame ionization detector (FID), which is used for the detection of
conventional organic volatiles;
b) Mass spectrometer (MSD), which is used for the detection of conventional
organic volatiles;
c) Electron capture detector (ECD), which is used for the detection of halides;
d) Nitrogen and phosphorus detector (NPD), which is used for the detection
of acrylonitrile.
6.2 Gas chromatographic column. Select a capillary gas chromatographic
column which can separate the components to be measured. As for the volatile
organic analysis of the styrene polymer package (1, 3-butadiene, acrylonitrile,
styrene, benzene, toluene, ethylbenzene, cumene), it is preferable to select HP-
INNOWA x 60 m x 0.32 mm (inner diameter) x 0.25 μm OR its equivalent.
6.3 Automatic headspace sampler. it is composed of the thermostatic sample
tray and the related accessories as required to reach to the requirements for
headspace vapour automatic sample injection.
6.4 Headspace bottle. 20 mL ~ 25 mL, with a rubber stopper gasket.
6.5 Syringe. it is calibrated; and the gas-tight syringes for headspace gas
chromatographic sample injection can be heated during sampling and injection
process.
6.6 Low-temperature freezing mill. with sieves of different apertures.
6.7 Constant temperature oven. it can maintain the temperature of 80 °C ~
150 °C (± 2 °C).
6.8 Analytical balance. its sensitivity is 0.0001 g.
Note 1. AVOID contacting with heated portion of the chromatograph, such
as detectors, columns, sample trays, hot vials, etc.
Note 2. Once heated, pressure is created in the sample vial containing the
polymer volatile components. After analysis, it shall use the syringe to empty
the pressure in the vial.
8.1.3 Headspace analysis conditions
The headspace heating temperature and time conditions are selected in
accordance with 8.1.2. Other headspace conditions are dependent on the
instrument used. OPTIMIZE the relevant parameters to obtain stable analysis
results and large detection signal values. The typical headspace analysis
conditions are shown in Appendix A.
8.2 Calibration
8.2.1 Calibration with solvent dissolution
Accurately PIPETTE the standard working solution A of certain volume [5.6.b)]
into the headspace bottle; the pipetted solution volume shall be consistent with
the volume of the solvent which is used to dissolve the sample in 7.4; quickly
SEAL the headspace bottle; PREPARE for the headspace-gas
chromatographic analysis. The calibration curve shall contain at least 5 different
concentrations.
8.2.2 Calibration without solvent dissolution
USE the calibrated syringe (6.5) to pipette a certain volume (2.0 µL ~ 10.0 µL)
of standard working solution B [5.6.c)] to the bottom of the headspace bottle;
quickly SEAL the headspace bottle; PREPARE for the headspace-gas
chromatographic analysis. The calibration curve shall contain at least 5 different
concentrations.
8.2.3 If the substrate of the sample to be measured has a great influence on
the measurement results of some volatile organic compounds, USE the
aforementioned two methods for measurement; if the recovery rate of the
sample to be measured cannot reach to the analysis requirements, it is allowed
to use the standard addition method in the Appendix B for detection.
Note. The calibration method described above requires periodic and repeated
calibration of the standard sample, AND the repeated calibration period is
determined based on the stability status of the chromatograph.
8.3 Headspace sample injection
8.3.1 Automatic sample analysis
PLACE the calibrated sample as mentioned in 8.2 AND the tested samples as
prepared in 7.4 and 7.5 into the constant t......
Related standard:   SN/T 4157-2015  SN/T 1504.5-2017
   
 
Privacy   ···   Product Quality   ···   About Us   ···   Refund Policy   ···   Fair Trading   ···   Quick Response
Field Test Asia Limited | Taxed in Singapore: 201302277C | Copyright 2012-2019