solvent extraction laboratory Articles

  • Emulsion breakingtechniques for oil in water solvent extractions

    Certain types of samples, such as those containing detergent, may form emulsions when doing an oil in water extraction into a solvent. The boundary between the solvent and the sample will have an emulsion layer that lias a cloudy or milky appearance as shown in tlris photo. According to U.S. EPA Method 1664, "if the emulsion is greater than one-third the volume of the solvent layer. Hie ...


    By Spectro Scientific

  • Selective recovery of heavy metals from hot-dip galvanising effluent streams by membrane-based solvent extraction

    The hot-dip galvanising process produces a large quantity of acidic effluent high in iron, zinc and chloride ions. The current method for disposal of the waste acid is to neutralise the remaining hydrochloric acid (HCl) to precipitate a worthless, environmentally harmful mixture of iron and zinc hydroxides that be disposed of to specialised landfill sites. The recovery of any of these species is ...


    By Inderscience Publishers

  • 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 ...

  • New White Paper features Solvents for Oil and Grease in Water Measurements

    A White Paper entitled, “Solvent Choices for Infrared Testing of Oil and Grease in Water” was recently published by Wilks Enterprise, Inc.  Infrared (IR) analysis is widely used worldwide for determining the amount of oil and grease in water as it is a cost-effective measurement technique that can be easily done on-site or in a laboratory.  Since water is a strong absorber ...


    By Spectro Scientific

  • The evaluation of extraction and cleanup methods for the determination of PCB aroclors in caulking and sealing material

    Buildings that were built and/or refurbished before 1977 may well have caulking used to seal masonry joints and windows that contain PCB Aroclor 1254 and/or 1260. The Aroclors were used as a plasticzier and were added to the material to ease application and improve resiliency. The caulking material has been mainly used when there are dissimilar materials, like brick next to concrete, metal window ...


  • SPE Cleanup of Wheat Extracts Prior to the HPLC Analysis of the Mycotoxin Deoxynivalenol

    Deoxynivalenol (DON) is a mycotoxin produced by the Fusarium fungal species graminearum and culmorum. These Fusariumfungi infect cereal crops primarily in wet conditions when temperatures range from 15–30 °C, resulting in grain head damage and DON contamination ...


    By Sigma-Aldrich Co., LLC

  • Testing Tar & Asphalt for Polyaromatic Hydrocarbons

    New regulations by the European Union require laboratory testing for polyaromatic hydrocarbons (PAHs) when recycling or disposing old tar or asphalt from road planings. Sitelab’s portable UVF-3100D and TD-500D analyzers have similar sensitivity to these types of compounds. The equipment is easy to operate and samples can be tested in the field in less than ...

  • Determination of Total Petroleum Hydrocarbons in Soil, Sediment, and Waste Samples using the SpeedExtractor E-916

    Total petroleum hydrocarbons (TPH) are a family of several hundred chemical compounds made from crude oil. TPH are found in soils and water. Exposure to TPH can affect human health and, therefore many laboratories around the world are analyzing TPH levels in the environment. This application note describes the extraction of TPH from soil, sediment, and waste samples using the SpeedExtractor ...


    By BÜCHI Labortechnik AG

  • Oil in frac water testing

    The amount of water used in and produced by hydraulic fracturing of shale gas wells is in the millions of gallons per well. Whether the water is going to be taken off site for disposal or reused for re-injection, the flowback or produced water needs pretreatment to remove any residual oil from the wa-ter. Waiting for remote laboratory results can take several days to a week. The InfraCal TOG/TPH ...


    By Spectro Scientific

  • Rapid on-site analysis of fats, oil and grease (FOG)

    It is estimated that 23-28% of Sanitary Sewer Overflows (SSOs) are due to Fats, Oils and Grease (FOG) or as much as 19 million gallons from 1998 to 2001 (State of North Carolina, 2004). Our increasingly mobile society has led to a decrease of cooking at home and a significant growth in the commercial food sector. This, on top of other industries such as metal processors, meat packers, cosmetic ...


    By Spectro Scientific

  • New ASTM Test Method Offers Quick and Easy Oil and Grease Measurement for Water and Soil Samples

    Onsite Field Measurement of Oil and Grease A quick and easy field analysis method for determining oil and grease concentration levels is important for both offshore oil platforms and soil remediation sites.. Prior to the Montreal Protocol, infrared (IR) analysis using Freon as an extraction solvent was a widely used field and laboratory method. In 1999, the U.S. EPA promulgated Method 1664A ...


    By Spectro Scientific

  • Determining trace amounts of contaminants in water

    Introduction Pesticides, polychlorinated biphenyls (PCBs), and pharmaceuticals are a worldwide contamination problem. Several major US water bodies, such as the Hudson River, St. Lawrence River, Fox River and the Great Lakes have been contaminated with PCBs from industries discharging into these water bodies for decades. For example, from approximately 1947 to 1977, the General Electric ...


    By Horizon Technology, Inc.

  • Maintaining regulatory method compliance while automating oil and grease analysis

    Regulatory compliance is at the heart of environmental analyses throughout the world. While some regulatory systems provide more flexibility in the methodology used for measuring contaminants, the goal is to gain reliable information that can be used for decision-making. Oil and grease measurement is a simple and important measurement of water quality, but time consuming1. Methods such as US EPA ...


    By Horizon Technology, Inc.

  • Manufacturers face challenges with pharmaceutical impurities

    Pharmaceutical manufacturers may face various challenges when attempting to meet the United States Pharmacopeia (USP) requirements for residual solvents (volatile organic chemicals).Residual solvents in pharmaceuticals are trace level impurities of volatile organic compounds in final products or excipients. In general, residual solvents originate from manufacturing processes related to the ...


  • Emulsion-Breaking Techniques for Accurate Oil in Water Measurements

    A White Paper discusses emulsion-breaking techniques for ensuring accurate oil in water measurements. Certain water samples, such as those containing detergent, may form an emulsion when oil in water extraction into a solvent is done. In order to ensure an accurate measurement, the emulsion must be broken. Six techniques are described that can be used for reducing an emulsion ...


    By Spectro Scientific

  • Knowing your A/A split from your elbow

    The term Total Petroleum Hydrocarbons (TPH) still remains poorly defined so that TPH data provided by laboratories is prone to disparity according to the analytical procedure undertaken, says Malcolm Avis of Chemtest. TPH data may be required for regulatory compliance, risk assessment, investigation or remediation. An appreciation of the methodology and terminology will ...


    By Newzeye Ltd

  • Determination of PAH in food

    Customer: Food and Feed Governmental lab., France France is divided into administrative regions and each region has its governmental lab. These labs analyze food products to check their compliance with the legal regulations, and to make sure that the products are not hazardous to health. Application: Determination of PAH in food Due to the guidelines ot ...


    By BÜCHI Labortechnik AG

  • Will your oil in water analysis method match the regulatory method?

    Anyone involved in field analysis of oil in water will continually get the question “Does your equipment match the regulatory method?” While the amount of oil in water is highly regulated -- it can also be a challenging measurement. It is complicated by the fact that oil comes in many forms and the measurement is defined by the particular regulatory method. When EPA 1664 is the ...


    By Spectro Scientific

  • Infrared Analysis Reduces Regulatory Fats, Oil and Grease (FOG) Testing Costs and Provides Fast Results

    Wastewater professionals who are enforcing industrial effluent standards for fats, oil and grease (FOG) either must perform numerous gravimetric tests or spend a considerable amount of money with a contracted testing laboratory.  Infrared analysis. using portable instruments such as the InfraCal TOG/TPH Analylzers -provides an alternative which will significantly reduce costs and ...


    By Spectro Scientific

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