Volatile organic compounds are closely related to health issues, air pollution, greenhouse gas and ozone concentrations. Its precise sampling and analysis are crucial for understanding and mitigating its impact on the environment.

With the deepening of research, the impact of trace pollutants on indoor and climate monitoring has become more clear. Therefore, in the analysis work, the detection lower limit requirements are becoming stricter and smaller. This is becoming increasingly difficult for reliable sampling and analysis of trace compounds. according toEPA32The requirements for reliability and inertness during sample collection and transportation in the monitoring work of refineries have become increasingly important.

Choosing inert and durable materials for the sample transportation process after sampling, the performance of their inner surface becomes the key to successful analysis. Mr. Stephen（S.T.)VSLofPersian, as well as the Dutch Meteorological Association (in collaboration with the German Meteorological Agency,DWD）Explained itVOCA large number of comparative studies have been conducted on the adsorption properties of various materials commonly used in analysis. 【*】

This study involves50℃and100℃The adsorption rate of the inner surface of the pipeline in contact with the sample. The results indicate thatSilcoNert®The inert coating of stainless steel processed by the process can prevent volatile organic compounds from being absorbed or reacting during transportation after sample collection. The study is summarized in the table below, highlighting the comparative results:

50℃and100℃Test results under certain conditions

mole fraction3Micromolar/molar, flow rate15ml/min

Untreated stainless steel is prone to adsorb active compounds and lose methanol samples Electrolytic polishing can make the surface smooth and reduce the total surface area, but adsorption is still significant.PFAandPEEKThe surface of the pipe needs to be carefully treated to achieve acceptable results.Sulfinert®After coating stainless steel, it does not adsorb active compounds because of the inert siliconCVDSurface bonding and diffusion onto the stainless steel substrate to prevent interaction with reaction sites.

The key to inert disposal of pipelines

Be sure to coat the entire pipeline process to prevent selective adsorption of any active surfaces. Without going throughSulfinert®Coated joints or sintered filters can significantly affect the analysis results and may lead to calibration failure. Meanwhile, if left untreated, it will also increase system maintenance and false positives/Negative results, advantages still require frequent retesting.

need to be conductedSulfinert®The components of the pipeline system treated with coating include regulators and flow controllers, valves, fittings, pipelines, and liners (glass products can also be treated with coating)Sulfinert®Coating treatment) sintering filter, sampling steel cylinder,GC，FTIRAnd related components.

【*】2016year4moon21Japan NetherlandsMeterlogicalAssociation（VSL）The German Meteorological Agency（DWD）Focus on Paris, FranceVOCProposed at the joint project meeting.