solvent concentration Articles

  • Concentration and solvent recovery of environmental samples in dichloromethane

    Environmental samples are usually extracted with an organic solvent which is then concentrated prior to final analysis. In this short note, initial conditions and evaporation settings for the parallel concentration of samples dissolved in dichloromethane (DCM) having different starting volumes are presented. These settings have been optimized for high analyte and high solvent recoveries. ...


    By BÜCHI Labortechnik AG

  • In Situ Bioremediation of Chlorinated Solvents

    ABSTRACT: In situ bioremediation is ongoing at a former manufacturing facility in Portland, Oregon.  Shallow groundwater at the site was impacted by chlorinated solvents, primarily trichloroethene and degradation products cis-1,2-dichloroethene and vinyl chloride.  In situ chemical oxidation treatment was completed in 2003 via the injection of sodium permanganate in source ...


    By EOS Remediation, LLC

  • Improved analyte recovery with keeper solvents

    Syncore Analyst: Evaporation to a defined volume with appendix, chiller and keeper solvent Polychlorinated biphenyls are suspected endocrine disruptors. They are enriched in the food chain which can result in elevated concentrations in fish and meat. The concentration of some PCBs is the subject of regulations and must be analyzed by reliable methods. Often, PCBs are extracted from a ...


    By BÜCHI Labortechnik AG

  • Solvent-free oil-in-water analysis

    Non-ionic surfactants can homogenize oily, produced water samples, creating optically clear microemulsions that are ideal for fluorescence measurements [1]. The use of surfactants to reduce fouling and improve the performance of on-line, fluorescence-based, oil-in-water monitors has been reported previously [2,3]. This paper describes the use of surfactants to prepare discrete water samples ...

  • Landfill remediation with refrigerants and chlorinated solvents

    PROJECT DESCRIPTION Between 1979 and 1980, industrial and hazardous wastes were disposed of at the Site in a series of unlined pits, each of which was used for a particular type of waste disposal. It is reported based on evaluations of manifests that approximately 3.4 million gallons of hazardous liquid wastes and between 3,700 and 4,100 tons of solid wastes were disposed of in the pits ...

  • Chlorinated solvents: methylene chloride and TCE

    Introduction This paper presents the results of a scaled and phased approach to source remediation of high concentrations of recalcitrant chlorinated solvent compounds via soil vapor extraction (SVE) and vapor treatment at a Site in Southern California. Phase I began with refrigerated condensation (C3) in order to achieve high mass removal rates to reduce lifecycle costs and time ...

  • Bioaugmentation to Treat Chlorinated Solvents in Fractured Bedrock

    ABSTRACT: An in situ bioremediation pilot study was performed at a former industrial site in New Jersey where groundwater has been impacted by historical releases of chlorinated solvents. The target area for treatment is a fractured, intermediate bedrock zone. The remedial objective at the Site is to treat the groundwater while minimizing the impact of the remedial system on the re-development of ...


    By EOS Remediation, LLC

  • Concentration dependence of biotransformation in fish liver S9: Optimizing substrate concentrations to estimate hepatic clearance for bioaccumulation assessment

    In vitro bioassays to estimate biotransformation rate constants of contaminants in fish are currently being investigated to improve bioaccumulation assessments of hydrophobic contaminants. The present study investigates the relationship between chemical substrate concentration and in vitro biotransformation rate of 4 environmental contaminants (9‐methylanthracene, pyrene, chrysene, and ...


    By John Wiley & Sons, Ltd.

  • Passively Enhanced In-Situ Biodegradation of Chlorinated Solvents

    Harding Lawson Associates (HLA) conducted a field demonstration to evaluate in situ enhanced anaerobic biodegradation of chlorinated solvents using Hydrogen Release Compound (HRC). The technology is designed to enhance the natural biodegradation process for a more rapid and complete degradation of the organic contaminants to non-toxic compounds (e.g., ethylene). This paper presents the results ...


    By Regenesis

  • In Situ Bioremediation of Chlorinated Solvents: A Case Study

    In situ bioremediation is ongoing at a former manufacturing facility in Portland, Oregon. Shallow groundwater at the site was impacted by chlorinated solvents, primarily trichloroethene and degradation products cis-1,2-dichloroethene and vinyl chloride. In situ chemical oxidation treatment was completed in 2003 via the injection of sodium permanganate in source areas. Subsequent stimulation of in ...


    By EOS Remediation, LLC

  • Recycling Solvents in Histology Department of Hospitals

    Industrial rotary evaporator: eco-friendly and cost-saving Solvents (ethanol, xylene and water) are used in histology for dewatering and destaining during the preparation of tissue sections. Here we show how these solvents are recycled in an automated process using an industrial rotary evaporator. We offer safe and efficient industrial distillation by intuitive ...


    By BÜCHI Labortechnik AG

  • Editor’s perspective - solvent cleanup standards

    Risk-assessment science is a critical tenet of the remediation industry, as it is the underlying basis of the majority of cleanup work performed. However, risk-assessment science is, for the most part, poorly understood by a large portion of environmental professionals. Most seasoned professionals understand the basic risk-assessment concepts related to the dose-response and exposure duration ...


    By WSP

  • Effect of reaction temperature and ligand concentration on the shape of CdSe nanocrystals

    Colloidal CdSe nanocrystals were synthesised in octadecene solvent using oleic acid and trioctylphosphine as ligands for cadmium and selenium precursors respectively. The reaction parameters, including temperature and ligand concentration, were investigated. The morphology, crystalline structure and optical properties of CdSe nanocrystals were studied by transmission electron microscopy, X-ray ...


    By Inderscience Publishers

  • EPA Compliant Due to Sufficient Solvent Recovery - Case Study

    Customer: Con-Test Analytical Laboratories, USA Con-Test Analytical Laboratory provides environmental and hygiene analytical services with the capability of analyzing nearly all water, air, soil, and solid materials. Application: US EPA 608 US EPA Method 608 covers the determination of certain organochlorine pesticides found in industrial waste ...


    By BÜCHI Labortechnik AG

  • Cost reduction of solvent recovery in pharmaceutical plants – Case Study

    Use of Solvents The pharmaceutical industry relies on the use of large quantities of organic solvents in a great number of manufacturing steps including chemical synthesis, fermentation, extraction, formulation and finishing of products. Solvents such as acetone, methyl ethyl ketone and tetrahydrofuran are commonly used as reaction media and for extracting products in the pharmaceutical, ...

  • Comparison of imidazolium ionic liquids and traditional organic solvents: effect on activated sludge processes

    Data concerning the biodegradability and ecotoxicity of ionic liquids (ILs) obtained so far are insufficient in the context of IL removal from wastewater in activated sludge systems. Thus, in this work the selected imidazolium ionic liquids and two organic solvents (methanol and acetone) were tested with respect to their influence on activated sludge processes, particularly on the morphology of ...


    By IWA Publishing

  • High Levels of Chlorinated Solvents Reduced to Non-Detect; Site Receives Closure

    CASE SUMMARY Manufacturing Facility, Europe The subject site has been used for the manufacture of industrial switchgear assemblies and warehousing since the 1970s. A subsurface investigation revealed a highly localized plume near WS10 with significant groundwater concentrations of trichloroethene (TCE) at 260 parts per million (ppm) along with its breakdown product ...


    By Regenesis

  • Integration of ceramic membrane and compressed air-assisted solvent extraction (CASX) for metal recovery

    In our previous publications, compressed air-assisted solvent extraction process (CASX) was developed and proved to be kinetically efficient process for metal removal. In the current study, CASX with a ceramic MF membrane integrated for separation of spent solvent was employed to remove and recover metal from wastewater. MF was operated either in crossflow mode or dead-end with intermittent ...


    By IWA Publishing

  • Copper cementation on iron using copper sulphate solution with different organic solvents

    Cementation reaction has been used to remove copper from aqueous solution using iron. The objective of the research has to study and characterise the particles obtained during reaction and also to determine purity of the particles by using different solvents. The reactions have been carried out with a specific concentration of copper sulphate with fixed volume of different solvents and iron of ...


    By Inderscience Publishers

  • In Situ Chemical Oxidation Remediation Pilot Study Of A Karst Bedrock Aquifer Contaminated With Chlorinated Solvents

    ABSTRACT A pilot study to evaluate an innovative in situ treatment technology was implemented at Letterkenny Army Depot, Chambersburg, Pennsylvania, for a limestone bedrock aquifer contaminated with chlorinated solvents. This technology destroys VOCs in groundwater, utilizing a network of injection points to deliver a solution of hydrogen peroxide (50%), catalysts, and surfactants. The ...


    By Weston Solutions, Inc

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