01 Solution Summary
Benzene series compounds such as benzene, toluene, ethylbenzene, and xylene in ambient air sampling samples are collected and enriched by sorbent tubes, then enter GC or GC-MS after thermal desorption and focusing transfer. Quantitation and quality control use the following arrangements: identification is based on the retention behavior of the target components and standard substances; calibration is performed according to the applicable method by external standard or internal standard using standard substances corresponding to benzene series compounds such as benzene, toluene, ethylbenzene, and xylene; injection blanks, calibration checks, and parallel determinations are used to monitor contamination and response stability. 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 |
|---|---|---|---|
| HJ 583-2010 | Ambient air—Determination of benzene series compounds—Solid adsorption/thermal desorption-gas chromatography | Current | Official source |
03 Samples and Analytes
The specific samples areAmbient air sampling samples, and the analytes areBTEX compounds such as benzene, toluene, ethylbenzene, and xylene. 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
Desorbed components enter the GC system, where they are separated, and responses are acquired by FID. The transfer path is kept inert and cold spots are reduced.
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 | 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 thermal desorption transfer injection for the separation and detection of benzene series compounds such as benzene, toluene, ethylbenzene, and xylene in ambient air sampling samples.
09 Analysis workflow
10 Qualitative, Quantitative, and Quality Control
Identification is performed based on the retention behavior of target components and reference standards; calibration is performed using reference standards corresponding to benzene, toluene, ethylbenzene, xylene, and other benzene series compounds by external standard or internal standard according to the applicable method; injection blanks, calibration checks, and parallel determinations are used to monitor contamination and response stability. 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 is thermal desorption-GC used for benzene, toluene, ethylbenzene, xylene, and other benzene series compounds?
Thermal desorption-GC matches the physicochemical properties, sample inlet, and detection targets of benzene series compounds such as benzene, toluene, ethylbenzene, and xylene; the complete route 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 benzene, toluene, ethylbenzene, xylene, and other benzene series compounds; both the main text and 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?
Thermal desorption transfer injection is responsible for introducing the processed ambient air sampling samples into the analysis system; the detection unit is configured for the response characteristics of benzene series compounds such as benzene, toluene, ethylbenzene, and xylene; both must be consistent with the method used.
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
14 References
Get Configuration and Technical Consultation
Please provide the sample information for the ambient air sampling samples, the concentration range of benzene series compounds such as benzene, toluene, ethylbenzene, and xylene, the testing batch size, the method basis, and the existing equipment. Huishi Instruments will then prepare the configuration list accordingly.
Information submitted.