01 Solution Summary
Chloroform, carbon tetrachloride, and volatile halogenated hydrocarbons covered by the method in ambient air sampling samples are collected and enriched by sorbent tubes, then introduced into GC or GC-MS after thermal desorption and focusing transfer. Quantification and quality control use the following arrangement: for chloroform, carbon tetrachloride, and volatile halogenated hydrocarbons covered by the method, calibration relationships are established using reference materials matched to the detection channel, and the identification basis, quantification mode, and result units are all subject to the applicable method; blanks, calibration checks, duplicate samples, and QC samples form batch quality control. Analysis batches also include blanks, calibration checks, and applicable QC samples.
02 Standards and Method Basis
Method basis: application method. The laboratory may enter the name and version of the adopted formal method into the project file.
03 Samples and Analytes
The specific samples areAmbient air sampling samples, and the analytes areChloroform, carbon tetrachloride, and the volatile halogenated hydrocarbons covered by the method. Pretreatment, injection, and detection configurations are determined according to the sample state, target concentration, and the formal method adopted.
04 Method Principle
When air or exhaust gas passes through the sorbent tube, target VOCs are enriched by the sorbent material. The thermal desorption device heats the sorbent tube to release target compounds and sends them into the chromatographic system through a focusing and transfer flow path.
05 Sample Collection and Pretreatment
Before use, sorbent tubes are blank-checked and labeled; after sampling, both ends are sealed, and they are transported and stored according to the applicable method. Thermal desorption batches include unsampled tube blanks and applicable spiked tubes.
06 Separation and Detection
The desorbed components enter the GC system, where they are separated, and the response is acquired by the ECD. The transfer path remains inert and minimizes cold spots.
07 Instrument System Configuration
| Module | Configuration | Role in This Solution |
|---|---|---|
| Sampling | Sorbent tubes and sampling pumps | Enrich target VOCs |
| Thermal desorption and injection | Thermal desorption transfer injection | Release, focus, and transfer target analytes |
| Chromatographic system | GC | Complete separation of components |
| Detection Unit | ECD | 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 an ECD and thermal desorption transfer injection for the separation and detection of chloroform, carbon tetrachloride, and the volatile halogenated hydrocarbons covered by the method in ambient air sampling samples.
09 Analysis workflow
10 Qualitative, Quantitative, and Quality Control
Calibration relationships are established for chloroform, carbon tetrachloride, and the volatile halogenated hydrocarbons covered by the method using reference materials matched to the detection channel; identification criteria, quantification mode, and result units are based on the applicable method; blanks, calibration checks, parallel samples, and quality control samples form batch quality control. Sorbent tube blanks, transport blanks, spiked tubes, and calibration checks are used to monitor background and recovery.
11 Method and Configuration Selection
- The sorbent material is matched to the target VOC range.
- The desorption, focusing, and transfer flow path serves as a continuous sample introduction chain.
12 Frequently Asked Questions
Why are chloroform, carbon tetrachloride, and the volatile halogenated hydrocarbons covered by the method analyzed by thermal desorption-GC?
Thermal desorption-GC matches the physicochemical properties, sample inlet, and detection targets of chloroform, carbon tetrachloride, and the volatile halogenated hydrocarbons covered by the method, and the complete workflow also covers the treatment, separation, detection, and data quality control of ambient air sampling samples.
What samples is this solution applicable to?
The applicable samples are ambient air sampling samples. When the sample source or matrix changes, the effect of coexisting components on pretreatment, separation, and detection response should be re-evaluated.
What components or indicators are included in the detection targets?
The analytes are chloroform, carbon tetrachloride, and the volatile halogenated hydrocarbons covered by the method; the main text and configuration are both bounded by this analyte 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.
What information is required before configuration?
It is recommended to provide real samples, a list of target compounds, expected concentration ranges, testing batch size, the method to be followed, and existing equipment conditions.
How are results kept traceable?
Sample numbers, reference materials, processing batches, instrument methods, raw data, calibration results, and review records together form the result traceability chain.
Why does thermal desorption use sorbent tubes?
Sorbent tubes can enrich VOCs from air during the sampling stage and then release them into the chromatographic system through controlled heating.
13 Related Solutions and Knowledge
Get Configuration and Technical Consultation
Please provide sample information for the ambient air sampling samples, the concentration ranges of chloroform, carbon tetrachloride, and the volatile halogenated hydrocarbons covered by the method, the testing batch size, the method basis, and existing equipment. Huishi Instruments will use this to prepare a configuration list.
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