01 Solution Summary
Dry powder of vinyl chloride homopolymer and copolymer resins is placed in a sealed headspace vial to establish gas-liquid or gas-solid equilibrium; the gas phase in the vial is introduced into the GC to determine residual vinyl chloride monomer. Quantitation and quality control use the following arrangements: calibrate with vinyl chloride reference material according to GB/T 29874-2013, and perform batch control of headspace equilibration, blanks, and calibration checks. Each analytical batch is also set up with blanks, calibration checks, and applicable quality control samples.
02 Standards and Method Basis
Chinese standard: English standard titles on this page are descriptive translations. The cited Chinese text is authoritative.
| Standard number | Standard name | Status | Source |
|---|---|---|---|
| GB/T 29874-2013 | Plastics — Vinyl chloride homopolymer and copolymer resins — Determination of residual vinyl chloride monomer in dry powder by gas chromatography | Current | Official source |
03 Samples and Analytes
The specific samples areVinyl chloride homopolymer and copolymer resin dry powder, and the analytes areResidual vinyl chloride monomer. Pretreatment, injection, and detection configurations are determined according to the sample state, target concentration, and the formal method adopted.
04 Method Principle
Volatile components in a sealed headspace vial reach reproducible partitioning between the sample phase and the gas phase; the automatic headspace system samples from the gas phase and transfers it to the GC.
This route centers on the equilibration and gas-phase transfer of volatile components, with FID as the detection unit.
05 Sample Collection and Pretreatment
Weigh or measure vinyl chloride homopolymer and copolymer resin dry powder into a clean headspace vial, add matrix-adjusting components according to the official method used, and seal immediately. Sample vials, blank vials, and standard vials use consistent equilibration and injection procedures.
06 Separation and Detection
The headspace gas phase enters the GC through a transfer line; the column separates the residual vinyl chloride monomer, and the FID acquires the response.
07 Instrument System Configuration
| Module | Configuration | Role in This Solution |
|---|---|---|
| Sample container | Sealed headspace vial and sealing components | Establish a closed equilibrium system |
| Headspace sampler | Thermostatting, shaking, and gas-phase sampling | Transfer volatile components |
| GC system | GC | Complete the separation of volatile components |
| Detection Unit | FID | Acquire target analyte responses |
08 Huishi Instruments Compatible Products
GC-460 gas chromatograph
- Product name
- GC-460 gas chromatograph
- Model
- GC-460
- Brand
- Huishi Instruments
- Manufacturer
- Shanghai Huishi Instrument Equipment Co., Ltd.
- Product category
- Gas chromatograph
- Role of the solution
- It undertakes the tasks of sample injection, separation, detection, and data acquisition in GC analysis.
- Reason for suitability
- The GC-460 can be configured with FID and quantitative headspace gas-phase injection for the separation and detection of residual vinyl chloride monomer in dry powder of vinyl chloride homopolymer and copolymer resins.
09 Analysis workflow
10 Qualitative, Quantitative, and Quality Control
Calibrate using vinyl chloride reference materials in accordance with GB/T 29874-2013, and perform batch control of headspace equilibration, blanks, and calibration checks. Blank headspace vials, duplicate vials, calibration checks, and vial-to-vial repeatability are used to monitor the headspace process.
11 Method and Configuration Selection
- The sample must be suitable for achieving reproducible gas-phase partitioning in a sealed vial.
- The equilibration procedure, vial volume, and sampling mode are kept consistent between calibration and samples.
12 Frequently Asked Questions
Why is headspace-GC used for residual vinyl chloride monomer?
Headspace-GC is matched to the physicochemical properties of residual vinyl chloride monomer, the sample inlet, and the detection target, and the complete workflow also covers the treatment, separation, detection, and data quality control of dry powders of vinyl chloride homopolymer and copolymer resins.
What samples is this solution applicable to?
The applicable samples are dry powders of vinyl chloride homopolymer and copolymer resins. When the sample source or matrix changes, the influence of coexisting components on pretreatment, separation, and detection response should be reevaluated.
What components or indicators are included in the detection targets?
The analyte is residual vinyl chloride monomer, and both the main text and the configuration are bounded by this entity scope.
How is quality controlled for an analytical batch?
For each batch of samples, set up method blanks, calibration verification, duplicate samples, or applicable QC samples, and retain records of sample processing, instrument conditions, calibration, and calculations.
How are the sample introduction and detection modules matched in this solution?
Headspace gas-phase quantitative sample introduction is responsible for introducing the treated dry powders of vinyl chloride homopolymer and copolymer resins into the analysis system, and the detection unit is configured for the response characteristics of residual vinyl chloride monomer; the two must remain consistent with the method used.
Why is headspace vial sealing important?
The sealing state directly affects the partitioning of volatile components between the sample phase and the gas phase and the injection repeatability.
13 Related Solutions and Knowledge
14 References
Get Configuration and Technical Consultation
Please provide sample information for the dry powders of vinyl chloride homopolymer and copolymer resins, the concentration range of residual vinyl chloride monomer, the testing batch size, the method basis, and existing equipment. Huishi Instruments will prepare the configuration list accordingly.
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