Solid Phase Extraction Articles on Environmental XPRT

Using Solid Phase Extraction for Determination of Contaminants in Water

Pesticides, Polychlorinated Biphenyls (PCBs), andpharmaceuticalsare a worldwide contamination problem. Because these contaminates are long lived in the environment and bioaccumulate throughout the food chain a great deal of research and regulations has been implemented. Several major US water bodies such as the Hudson River, St. Lawrence River, Fox River and the Great Lakes have been contaminated ...

Sep. 7, 2011

By Horizon Technology, Inc.

How Solid Phase Extraction Minimizes the Use of Hazardous Solvents

According to water analysis expert Bob Johnson, CEO of Horizon Technology, Inc., the search for contaminants in water sources is creating more contamination than the original material it was intended to remove. Common techniques for isolating pollutants in defined volumes of water include Liquid-Liquid Extraction (LLE) and Continuous Liquid-Liquid Extraction (CLLE). These labor intensive ...

Nov. 6, 2011

By Horizon Technology, Inc.

Low Background Solid Phase Extraction and Capillary GC Analysis of Chlorinated Pesticides

Solid phase extraction has been the main focus for sample preparation for monitoring semivolatiles, including pesticides, in aqueous hazardous waste samples because it provides rapid, on-site sample preparation and analysis. Supelco's ENVI-8 polumerically bonded octylsilane-silica packing provides good performance for solid phase extraction of pesticides for aqueous samples. ...

Dec. 31, 2004

By MilliporeSigma

Solid Phase Extraction of Pesticides from Fruits and Vegetables, for Analysis by GC or HPLC

Recovery rates for polar analytes, including carbamate and thiourea pesticides, are higher and less variable with ENVI-Carb carbon-based solid phase extraction tubes than with C8- or C18- silica-based tubes. Independent investigators found ENVI-Carb tubes to be an effective part of sample cleanup for more than 200 organochlorine, organophosphorus, nitrogen-containing, and carbamate pesticides, ...

Dec. 31, 2004

By MilliporeSigma

Solid-phase extraction of room-temperature imidazolium ionic liquids

Abstract Owing to their favorable properties, ionic liquids have recently gained recognition as possibly environmentally benign solvents. Now among the most promising industrial chemicals, they have already been labeled 'green' but this appellation seems due entirely to their very low vapor pressure. This growing interest in the various applications of ionic liquids will soon result in ...

Dec. 23, 2004

By Springer

Cleanup of Hazardous Waste Site Samples by Solid Phase Extraction

ENVI-Florisil solid phase extraction tubes meet the requirements for pesticide recovery from water, sediment, and soil samples taken from hazardous waste sites, as described in US EPA Contract Laboratory Program methodology. Mean recovery of nine pesticides was 82% or better, well within the specifications of the CLP method. A procedure for recovering the pesticides is described. ...

Dec. 31, 1998

By MilliporeSigma

A comparison of two solid phase extraction methods for the analysis of Polyaromatic Hydrocarbons in butter

Background Polyaromatic hydrocarbons (PAHs) are ubiquitous in the environment, resulting from both natural and manmade sources of combustion. Farm animals, such as cows, can become exposed to them through both consumption of contaminated feed and water, and inhalation of contaminated atmosphere ...

Nov. 30, 2015

By MilliporeSigma

Analysis of phenols in wastewater using capillary electrophoresis and solid phase extraction

A solid phase extraction (SPE) method was developed for phenol, 4-nitrophenol, 4-chlorophenol and 4-cyanophenol from the wastewater. The recoveries were 95%, 93%, 92% and 90% for phenol, 4-nitrophenol, 4-chlorophenol and 4-cyanophenol, respectively. The elution was carried out by methanol (1 mL) at 0.25 mL/min. flow rate. The optimisation of SPE was achieved by using different eluting solvents, ...

Jul. 25, 2006

By Inderscience Publishers

Determination of chlorophenols in sediment using ultrasonic solvent extraction followed by solid-phase extraction, derivatization, and GC-MS analysis

A method for determination of chlorophenols (CPs) in sediments was developed using ultrasonic solvent extraction followed by solid-phase extraction, derivatization, and gas chromatography–mass spectrometry (GC-MS) analysis. Some effective operational details and parameters on mixing of samples and extraction solvent, adsorption loss, and extraction cycles of the derivatives were studied and ...

Apr. 22, 2017

By IWA Publishing

The Extraction of Glycols From Water Using ENVI-Carb™ Plus Solid Phase Extraction Cartridges

The analysis of glycols such as propylene and ethylene glycol from water samples is traditionally done by direct aqueous injection into a gas chromatograph. Aqueous injections are problematic in GC analysis due to issues such as the large expansion volume of water in the inlet, increased carryover, and elevated detection limits. In this work, we have evaluated a unique carbon adsorbent, ENVI-Carb ...

Nov. 3, 2010

By MilliporeSigma

A novel fiber coating for solid phase microextraction and its application for the extraction of n-alkane from aqueous sample

Base on the previous work in laboratory, a novel polyaniline doped with polydimethylsiloxane coating was developed on a stainless steel wire for solid phase microextraction (SPME) by electroplating method. This electroplating method not only has advantages of ease preparation and simple equipments required, but also increases the lifetime of the SPME fiber. The composite fiber ...

Feb. 27, 2007

By IOS Press

Characterizing the properties of dissolved organic matter isolated by XAD and C-18 solid phase extraction and ultrafiltration

The properties of aquatic dissolved organic matter (DOM) isolated by solid phase extraction (SPE) C-18 cartridges, ultrafiltration, and XAD chromatography are compared. Samples taken from the Suwannee River, Georgia, USA and McDonalds Branch in the Pine Barrens, New Jersey, USA were chosen to represent waters where DOM originates from predominantly terrestrially-derived (allochthonous) ...

Mar. 1, 2005

By Springer

Stability of pharmaceuticals and other polar organic compounds stored on polar organic chemical integrative samplers and solid‐phase extraction cartridges

The stability of 24 chemicals, including pharmaceuticals and personal care products, and some agrochemicals on extraction media was evaluated by preloading them onto Oasis hydrophilic lipophilic balanced solid‐phase extraction (SPE) cartridges and polar organic chemical integrative samplers (POCIS) followed by storage at −20°C over time. After 20 months, the average loss was 11% on POCIS, with ...

Nov. 24, 2012

By John Wiley & Sons, Ltd.

Monitoring organophosphorus pesticides and their degradation products formed by Fenton's reagent using solid-phase extraction–gas chromatography–mass spectrometry

Styrene-divinylbenzene co-polymer (PLRP-S) has been found to be a suitable sorbent for the extraction of organophosphorus pesticides (OPPs) and their decomposition products formed by reaction with the Fenton reagent. The preconcentrated analytes have been eluted with ethyl acetate and analysed by GC-MS. A linear calibration graph was obtained for 0.5–40 µg L-1 of OPPs using 60 ml of sample ...

Jul. 25, 2006

By Inderscience Publishers

Solid-phase extraction and gas chromatography-tandem mass spectrometry method for the simultaneous determination of several pesticides in water

Contamination of surface and groundwater sources with pesticide residues has been of great concern for a long time and it is a major challenge for the preservation and sustainability of the environment. In order to accomplish the requirements of the European Directive 98/83/EC, we developed and validated an analytical method based on the combination of gas chromatography and tandem quadrupole ...

Aug. 1, 2010

By IWA Publishing

Knotted in-tube and mini-column solid phase extraction of polycyclic aromatic compounds and nitroaromatics from aqueous samples for their determination by gas chromatography–mass spectrometry

The selectivity of in-tube extraction by PTFE tubing vis-a-vis mini-column SPE has been evaluated for preconcentration and cleanup of PACs in their natural matrix, and has been found to effectively remove many polar analytes such as nitrogen containing aromatic heterocyclic compounds, anilines, phenols and certain organophosphorus pesticides. Knitting of tubings created a secondary flow pattern ...

Jul. 25, 2006

By Inderscience Publishers

Analysis of pesticide residues in drinking water samples using solid-phase micro-extraction (SPME) coupled to a gas chromatography-electron-capture detector (GC-ECD)

The headspace solid-phase micro-extraction (HS-SPME) method with polydimethylsiloxane (PDMS, 100 μm) fiber is a cost-effective technique for the determination of different pesticide residues in environmental and biological samples followed by a gas chromatography-electron-capture detector (GC-ECD). In the present study more than 147 water samples collected in and around Lucknow city were ...

Dec. 1, 2011

By IWA Publishing

Electromagnetically vibrated Solid-Phase Microextraction for the analysis of organic compounds

A newly developed electromagnetically vibrated Solid-Phase Microextraction (SPME) device for extracting 1, 4-dichlorobenzene and toluene from aqueous matrices was evaluated in terms of sorption equilibrium time, precision, and detection level relative to three other more conventional extraction techniques involving SPME, viz., static, magnetic stirring, and fibre insertion/retraction. ...

Feb. 11, 2010

By Inderscience Publishers

Field Sampling for Pesticides, Using Solid Phase Microextraction/Capillary GC

An SPME portable field sampler can be used to extract analytes from samples in the field, then store them for up to 3 days, or longer, before performing the analysis. A field sampler with a 100µm polydimethylsiloxane-coated fiber extracts chlorinate, organophosphorus, triazine, and other pestricides from water. After 24 hours of storage, analyte loss from storage containers was far ...

Dec. 31, 1997

By MilliporeSigma

Fast Analysis of Environmental Samples, Using Solid-Phase Microextraction (SPME)

Solid Phase MicroExtraction (SPME) is an alternative to conventional sample extraction techniques. In SPME, analytes establish an equilibrium between the sample matrix and a stationary phase coated on a fused silica fiber (Figure A). The fiber is thermally desorbed in the injection port of the GC, which transfers the analytes into the capillary column. Because no solvent is injected, and the ...

Dec. 31, 1998

By MilliporeSigma

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