Online VOC gas chromatograph

Online VOC gas chromatograph
The online VOC gas chromatograph uses a combination of chromatographic column combination, central cutting technology, back blowing and venting technology, and a combination of hydrogen flame ionization detector (FID) and micro cell electron capture detector (μ - ECD) technology for the detection of methane, carbon dioxide, and N2O. The sample is brought into the chromatographic column for pre separation by carrier gas, and after oxygen is released, CH4 and CO2 (converted by Ni) are detected by the FID detector, while N2O is switched to the μ - ECD detector for detection.
1、 Principle
The water sample blown from the external environment is first removed of moisture by an online water removal device, and then adsorbed into a combination of adsorption tubes. The adsorption tubes are quickly heated to 250 ℃ for desorption, and the switching valve V1 is switched from OFF to ON. The carrier gas 1 enters the pre column separation with the gas sample thermally decomposed. After the target compound enters the analysis column, V1 is closed, and the carrier gas 2 blows the high boiling point compound back out of the pre column. The target compound continues to separate in the analysis column. The FID detector detects signals of benzene derivatives, while the ECD detector detects signals of halogenated hydrocarbons.
2、 Characteristics:
>Full online analysis: Sample enrichment, desorption, and sample analysis are all conducted online;
>Rapid heating and instant desorption injection greatly reduce analysis errors;
>Adopting the pre-treatment technology of blowing and capturing, the blowing bubbles are evenly and finely distributed, which can meet the requirements of PPT level sample detection;
>The entire high-temperature tracing system effectively reduces losses during sample transportation;
>Using gas chromatography to determine VOCs in water, which complies with the national standard method;
>The instrument has power on self-test function, power-off protection function, automatic restart function and alarm function to ensure system safety and stability;
>Using automatic electronic flow control technology (EPC) to control carrier gas, air, and hydrogen, with high precision (0.01psi), good repeatability and reproducibility;
>All core components are used, with high reliability and long service life.
3、 Application Fields
Environmental water, surface water, seawater, groundwater, domestic sewage, industrial wastewater