An integrated device for pre-treatment of groundwater volatile organic compounds

Abstract

The invention relates to an integrated device for the pretreatment of groundwater volatile organic compounds, which comprises a four-way pipe assembled on a cylindrical container, a sealing cover is screwed into the container port, a tube body is screwed into the sealing cover, the lower part of the tube body shrinks radially, and the tube body The body is provided with slits, and a thin-walled tube is set in the tube body. The upper port of the thin-walled tube is radially expanded, and the expanded end is embedded in the expanded end formed by the radially expanded upper port of the tube body. The invention realizes the versatility of the adsorption / desorption batch experiment oscillation and the centrifuge tube body, can realize the sealed connection with the solid phase extraction device, avoids the steps of multiple transfer of the solution, open pipetting of the supernatant and the like in the traditional process, and can be used Reduce the loss of adsorbent and adsorbate, and effectively prevent the escape of volatile organic compounds. It can realize the integration of activation, enrichment, cleaning and elution processes, reduce errors and secondary pollution caused by manual complicated operations, and ensure the sealing of the whole process. It can achieve fixed volume extraction, and realize extraction sealing and batching.

Description

technical field [0001] The invention relates to an integrated device for adsorption / desorption batch experiment and pretreatment of groundwater volatile organic matter. Background technique [0002] Volatile organic compounds are ubiquitous pollutants in the groundwater environment. When studying the pollution mechanism, their volatile characteristics make the recovery rate low, especially in the complicated adsorption / desorption batch experiments and pretreatment. Experimental comparability and recovery are difficult to guarantee. [0003] The main steps and experimental vessels in the traditional experimental process include the following aspects: [0004] (1) Adsorption / desorption batch test process: The main experimental vessel is a triangular glass bottle with a ground mouth and a stopper, and the adsorbate (volatile organic compounds and other substances) and the adsorbent are fully shaken in the triangular flask to make the adsorption / desorption process reach equilib...

AI Technical Summary

Problems solved by technology

[0006] ① The transfer of the solution caused the loss of volatile organic compounds

However, the currently used commercial Erlenmeyer flasks and centrifuge tubes are all smooth inner wall structures, and the full mixing in the Erlenmeyer flasks and the centrifugation process of the centrifuge tubes are long, which wastes experimental time; ③ The four independent operations are very cumbersome and require a lot of consumption Material resources, manpower, and manual operation have large errors, which affect the experimental results; ④The enrichment process in solid-phase extraction is completed under completely open conditions, which is easy to cause volatile organic compounds to escape and artificial secondary pollution; ⑤When the adsorbent When the particle size is large and the hardness is high, if the adsorbent is gravel with large particle size, the vibration process will easily cause damage to the triangular flask and centrifuge tube

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