01 Solution Summary
Ambient air sampling samples enter a dedicated GC flow path through airtight sampling and gas valve quantitative injection, where total hydrocarbons, methane, and non-methane total hydrocarbons are separated and determined. Quantitation and quality control use the following arrangements: identification is based on the retention behavior of target components and reference materials; calibration is performed by external standard or internal standard according to the applicable method using reference materials corresponding to total hydrocarbons, methane, and non-methane total hydrocarbons; injection blanks, calibration checks, and parallel determinations are used to monitor contamination and response stability. Each analytical batch also includes blanks, calibration checks, and applicable quality control 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 areTotal hydrocarbons, methane, and non-methane total hydrocarbons. Pretreatment, injection, and detection configurations are determined according to the sample state, target concentration, and the formal method adopted.
04 Method Principle
After gas samples are airtight-connected and purged, they enter the chromatographic system by gas valve quantitative injection. Different components are separated via dedicated flow paths, and responses are acquired by FID.
05 Sample Collection and Pretreatment
The sampling container, pressure-reducing components, tubing materials, and purging process are compatible with the sample and target components, and sampling and injection records cover pressure, connection, and purging status.
06 Separation and Detection
The gas path, valve system, and chromatographic column are configured around total hydrocarbons, methane, and non-methane total hydrocarbons, and FID is used to record the responses of target components.
07 Instrument System Configuration
| Module | Configuration | Role in This Solution |
|---|---|---|
| Gas sampling | Airtight container, pressure-reducing, and connection components | Obtain a representative gas sample |
| Valve injection | Gas valve quantitative injection. | Quantitatively introduce the sample |
| GC flow path | GC | Complete separation of target components |
| Detection Unit | FID | Acquire component 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 gas valve quantitative injection, and is used for the separation and detection of total hydrocarbons, methane, and non-methane total hydrocarbons in ambient air sampling samples.
09 Analysis workflow
10 Qualitative, Quantitative, and Quality Control
Identification is based on the retention behavior of the target components and reference materials; using reference materials corresponding to total hydrocarbons, methane, and non-methane total hydrocarbons, external standard or internal standard calibration is employed according to the applicable method; injection blanks, calibration checks, and parallel determinations are used to monitor contamination and response stability. Standard gases, system blanks, calibration checks, and replicate injections are used to monitor gas tightness and response stability.
11 Method and Configuration Selection
- Gas path materials are compatible with samples and target components.
- The detection channel is limited to FID.
- The gas valve and sample loop meet batch repeatability requirements.
12 Frequently Asked Questions
Why is gas analysis GC used for total hydrocarbons, methane, and non-methane total hydrocarbons?
Gas analysis GC matches the physicochemical properties, sample inlet, and detection targets of total hydrocarbons, methane, and non-methane total hydrocarbons; the complete route simultaneously 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 detection targets are total hydrocarbons, methane, and non-methane total hydrocarbons, and 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.
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.
13 Related Solutions and Knowledge
Get Configuration and Technical Consultation
Please provide sample information for the ambient air sampling samples, the concentration ranges of total hydrocarbons, methane, and non-methane total hydrocarbons, detection batch size, method basis, and existing equipment. Huishi Instruments will then compile a configuration list.
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