Vacuum Extraction
Vacuum Extraction - Related Videos
02:44
Endovascular Treatment of Acute Ischemic Stroke Using the Stent Retriever-Assisted Vacuum-Locked Extraction Technique
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2025
Source: Schregel, K., et al. Optimized Management of Endovascular Treatment for Acute Ischemic Stroke. J. Vis. Exp. (2018).This video demonstrates the endovascular treatment of acute ischemic stroke using the stent retriever-assisted vacuum-locked extraction technique. A guiding sheath is introduced through the femoral artery to reach the clot. A catheter with a stent retriever secures and extracts the clot. Vascular imaging is done to confirm successful reperfusion.
09:19
Capturing Actively Produced Microbial Volatile Organic Compounds from Human-Associated Samples with Vacuum-Assisted Sorbent Extraction
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Cited by 2 •
2022
This protocol describes the extraction of volatile organic compounds from a biological sample with the vacuum-assisted sorbent extraction method, gas chromatography coupled with mass spectrometry using the Entech Sample Preparation Rail, and data analysis. It also describes culture of biological samples and stable isotope probing.
06:20
Proper Operation of Vacuum Based Equipment
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2023
Source: Robert M. Rioux, Ajay Sathe & Zhifeng Chen, Pennsylvania State University, University Park, PA Vacuum is required for a number of laboratory procedures. This is most routinely achieved in the laboratory by the use of vacuum pumps. In addition to working at low pressures, vacuum pumps can also be used to enable rapid changing of the atmospheres in a reactor or flask by evacuation and backfilling.
19:00
Extraction - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA Cellulose RecoveryExpand Extraction and filtration can separate compounds based on their solubility properties. In this lab, you'll separate a mixture of cellulose, caffeine, and benzoic acid based on their solubilities in dichloromethane, or DCM, and water. Caffeine and benzoic acid are both soluble in DCM, but cellulose is not. Thus, in this part, you'll first dissolve as much of the mixture as...
02:58
Extraction - Instructor Prep
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2020
Source: Lara Al Hariri at the University of Massachusetts Amherst, MA, USA Preparation of the LaboratoryExpand Here, we show the laboratory preparation for 10 students working in pairs, with some excess. Please adjust quantities as needed. Put on a lab coat, splash-proof safety glasses, and nitrile gloves. Place labeled containers for halogenated waste and solid reagent waste in a satellite waste hood. Place a glass waste container nearby. Label a 20-mL vial as...
FAQs
Extraction wells generate negative pressure that creates a pressure gradient between surrounding subsurface areas and the well. This gradient pulls contaminated air, and in some systems vapors or liquids, toward the extraction point. The resulting flow helps collect contaminants from pore spaces and can reduce their migration through affected soil or groundwater zones.
Soil permeability determines how readily air and contaminant-bearing fluids can move toward an extraction well. More permeable conditions generally support movement through the subsurface, while limited permeability can restrict the area influenced by the pressure gradient. Consequently, soil properties must be considered when evaluating expected contaminant removal and selecting well locations.
Volatility influences how readily a contaminant enters the extracted vapor stream, making the technique especially relevant to volatile and semivolatile compounds. Moisture content also affects subsurface conditions and contaminant movement. Together, these factors help determine whether contaminants can be drawn into the recovered stream effectively and how the extraction system should be designed.
Well design and placement determine how effectively negative pressure reaches contaminated areas and how completely the system captures the recovered stream. Wells must be considered in relation to contaminant distribution, soil permeability, and subsurface pore spaces. Appropriate placement can improve collection, limit contaminant migration, and support more consistent remediation performance.
The system first draws contaminated air, vapors, or liquids toward extraction wells. The recovered stream is then collected and may be separated into relevant components before treatment. Treated material can be released or disposed of as appropriate. This handling sequence prevents extracted contaminants from simply being transferred back into the environment.
The technique is particularly applicable where petroleum hydrocarbons or other volatile organic compounds affect unsaturated soil. It can also address contamination associated with subsurface pore spaces and, in some systems, groundwater-related vapors or liquids. Its suitability depends on contaminant volatility, soil permeability, moisture content, and the ability to position effective extraction wells.
By drawing contaminated material toward controlled extraction points, the method can help limit contaminant migration through the subsurface. It can also reduce potential exposure risks associated with petroleum hydrocarbons and other volatile organic compounds. Treatment of the recovered stream adds an additional control step before release or disposal, supporting safer remediation management.