At present, the main method for the detection of environmental water samples (VOCs) in China is static headspace analysis, but the sensitivity is low, which can not meet the needs of trace detection. VOCs in drinking water, surface water and seawater are analyzed by purging trap and gas chromatography, using micron/L level (even ng/L level), and the detection limit is 10-1000 times lower than that of static headspace technology.

The purge analysis method of volatile or semi-volatile organic compounds is suitable for extracting liquid or solid samples with boiling point below 200 ℃, solubility less than 2%, abundant volatile organic compounds, and trace composition analysis. The method is used for sample pretreatment, does not use organic solvents, does not cause secondary pollution to the environment, has small sampling volume, high enrichment efficiency, little interference by the matrix, and is easy to detect online. However, the cleaning method is easy to produce foam, which leads to overload of the instrument. Moreover, the use time is long, the possibility of introducing impurities and the choice of adsorbent performance are purged. In addition, accompanied by steam injection, water also has a quenching effect on the flame detector.

Our company's fully automatic solid/liquid integrated purge trap is a one-button type, which can automatically complete sample injection analysis without manual work.

1. Drinking water, wastewater, soil and other solid-liquid samples can be used for purging and collection.

2. Automatic leak detection and fault alarm function ● Sampling system The sampling arm moves smoothly, accurately and with low noise.

3. Touch screen control, rich interface information, simple operation; set method parameters, real-time display of working status and running time.

4. All temperature control links and equipment can control the temperature separately.

Characteristics and main functions of purging trap.

1. Fully automatic one-key start, samples automatically complete sample analysis, no need for manpower.

2. Drinking water, wastewater, soil and other solid-liquid samples can be used for purging and collection.

3. The sampling arm of the sampling system moves smoothly, accurately, with low noise, and has automatic leak detection and fault alarm functions.

4. Touch screen control, rich interface information, simple operation, parameter setting, real-time display of working status and running time.

5. All temperature control links and equipment can control the temperature separately.

6.10 editors. Storage. Call the method at any time, press the start button, and automatically complete the sample analysis.

7. Start the GC-MS, data processing station, or use an external event program to start the device.

8. The trap is separated from the purge tube blowback gas to reduce cross-contamination between samples.

9. Purge and trap are transported through inert pipe connections to reduce contamination residues.

10. The connection point between the six-way valve and the conveying pipe is located in the heating insulation box, and there is no cold point transmission to ensure the integrity of the sample.

11. The water removal trap removes water vapor at the purge end, greatly reducing the effect of water vapor on the gas phase and gas chromatography/MS.