Solid liquid integrated blowing and capturing instrumentIt is an analytical pre-processing device that integrates automation, high sensitivity, and multi scenario adaptability, widely used in environmental monitoring, food safety, industrial safety, and scientific research fields. The core principle is based on dynamic headspace technology, which uses high-speed airflow (such as helium or nitrogen) to blow the sample (solid or liquid), causing volatile organic compounds (VOCs) to detach from the matrix and accumulate in the capture tube. Then, after high-temperature analysis, they are directly separated and detected by gas chromatography (GC) or gas chromatography-mass spectrometry (GC/MS). This process achieves efficient enrichment and precise analysis of trace VOCs.

　　Solid liquid integrated blowing and capturing instrumentCore modules:

1. Sample processing system

Purging unit:

Function: Blow the surface or interior of the sample with inert gas (such as nitrogen, helium) to displace VOCs into the gas phase.

Key components:

Blowing needle: directly contacts the sample (liquid or solid), usually made of stainless steel or PTFE, to avoid adsorption or reaction.

Flow controller: Accurately adjust the blowing gas flow rate (such as 10-100 mL/min) to ensure blowing efficiency.

Heating module (optional):

Function: Heat liquid samples or purge gases (such as 40 ℃~100 ℃) to promote VOCs volatilization.

Application: Suitable for samples with low volatility at low temperatures, such as oils and soils.

2. Capture system

Capture pipe:

Function: Absorb and blow out VOCs, commonly filled with Tenax (2,6-diphenyl-phenylene dioxide), activated carbon, or silica gel.

Features: High specific surface area, high temperature resistance (can withstand thermal desorption at 250 ℃~300 ℃).

Cold trap (optional):

Function: Capture high boiling point substances at low temperatures (such as -30 ℃) to prevent contamination caused by entering the GC column.

Principle: Low temperature focusing is achieved through liquid nitrogen or semiconductor refrigeration.

3. Thermal desorption system

Function: Instantly desorb VOCs from the capture tube at high temperatures (such as 250 ℃~300 ℃) and load them into GC or MS analysis.

Key components:

Heating furnace: program-controlled temperature, controllable heating rate (such as 10 ℃/s).

Desorption gas flow path: Inert gas (such as helium) sends the desorbed VOCs into the chromatographic column.