solid phase extraction Articles | Environmental XPRT

Extraction of abuse drugs in biological media

Extraction methods are determined by the nature of the matrix, the drug to be isolated and the availability of equipment, staff and economic resources. This review critically describes the main extraction techniques commonly known as 'Liquid-Liquid' (LLE), those using modified Infusorial Earth (IE), Solid Phase Extraction (SPE), Solid Phase Micro Extraction (SPME) and Supercritical Fluids ...

May 7, 2010

By Inderscience Publishers

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

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

Identification of antibiotics in wastewater: current state of extraction protocol and future perspectives

The release and occurrence of antibiotics in the aquatic environment has generated increased attention in the past few decades. The residual antibiotic in wastewater is important in the selection for antimicrobial resistance among microorganisms and the possibility of forming toxic derivatives. This review presents an assessment of the advancement in methods for extraction of antibiotics with ...

Sep. 15, 2017

By IWA Publishing

Determination of Pesticide Residues in Oranges by an Automated QuEChERS Extraction

Abstract With the rise in popularity of QuEChERS, due to its reliable multiresidue methods it has driven the need for automation of the QuEChERS extraction to increase productivity and throughput. The AutoMateQ40 streamlines the QuEChERS method from adding Acetonitrile (ACN) and buffering salts, shaking, mixing, centrifugating the sample, transferring to a dispersive solid phase extraction ...

Sep. 26, 2014

By Teledyne Tekmar

Proficiency test of non-target screening with gas chromatography mass spectrometry to confirm a detected contamination of raw and drinking water

Much of the water supply industry has implemented online monitoring and warning systems for chemical or biological contaminations. When a contamination is detected, further investigations are necessary to confirm or to cancel the initial alarm. The proficiency of a non-target screening approach with solid phase extraction and GCMS in full-scan mode was examined. A selection of pesticides and ...

Dec. 1, 2010

By IWA Publishing

Uptake of perfluoroalkyl acids in the leaves of coniferous and deciduous broad‐leaved trees

Analytical methods for determining perfluoroalkyl acids (PFAAs) in leaves were developed to quantify a suite of analytes in both coniferous and deciduous broad‐leaved trees. Sodium hydroxide‐methanol and solid‐phase extraction was selected as extracting and cleaned‐up strategy for PFAAs analysis. Ten perfluorocarboxylic acids (PFCAs) and four perfluorosulfonic acids (PFSAs) were monitored in ...

Mar. 13, 2015

By John Wiley & Sons, Ltd.

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

Determination of toxic heavy metals in sea water by FAAS after preconcentration with a novel chelating resin

A solid phase extraction procedure was developed for preconcentration of toxic heavy metals such as cadmium, cobalt, copper, manganese, lead and zinc in sea water samples. A microcolumn packed with 6-[(4-hydroxyphenyl)diazenyl]naphthalene-2,3-diol-formaldehyde (HPDN-F) resin acts as a sorbent to retain the analyte ions by forming metal chelates. The retained trace level metal was subsequently ...

Jan. 1, 2011

By IWA Publishing

How to Choose the Best Vacuum Pump for Your Lab

Vacuum pumps are a versatile piece of laboratory equipment for suctioning via negative pressure. They are routinely used in biological sciences for filtration, distillation and concentration of volatile solvents, solid phase extraction, freeze drying, and more. Even though vacuum pumps share a common function, there are many considerations to take into account when choosing a new pump. The ...

Sep. 11, 2020

By Sterlitech Corporation

Merck KGaA, Darmstadt, Germany News on Water 2018, Volume 1

This volume of News on Water highlights: New ISO Standard 17943 for Determination of VOCs in Water by HS-SPME and GC-MS Extraction of Organic Compounds from Water, Using ENVITM-18 DSK Solid Phase Extraction Disks Watercol columns Certified Reference Materials ready-to-use for water and waste water analysis Detect low concentrations of impurities in water The Standard ...

May 22, 2018

By Merck KGaA, Darmstadt, Germany

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

Solid phase extraction of trace amounts of cadmium(II) ions in water and food samples using iron magnetite nanoparticles modified by sodium dodecyl sulfate and 2-mercaptobenzothiazole

A new, simple and rapid method for solid phase extraction and preconcentration of trace amounts of cadmium ions using 2-mercaptobenzothiazole/sodium dodecyl sulfate immobilized on magnetite nanoparticles (MBT-SDS-MNPs) was proposed. The method is based on the extraction of cadmium ions via complexation with MBT immobilized on SDS-coated MNPs and their determination by flame atomic absorption ...

Jan. 2, 2017

By IWA Publishing

Determination of Pesticide Residues in Tea by an Automated QuEChERS Solution

Abstract The QuEChERS (Quick-Easy-Cheap-Effective-Rugged-Safe) sample extraction method was developed for the determination of pesticide residues in agricultural commodities. While originally QuEChERS has been developed for plant matrices the technique has since been adapted to be used in several applications and in many additional matrices such as dry tea samples. With the rise in popularity of ...

Feb. 16, 2015

By Teledyne Tekmar

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-Verlag GmbH

GC-MS/MS Analysis of Pesticides in Drinking Water

According to Japan’s list of drinking water quality control substances, pesticides are included as supplemental items subject to analysis. Designed to complement the standards, the Ministry of Health, Labour and Welfare encourages water utilities to monitor pesticide levels and achieve specified targets. Among the 102 listed pesticides, 84 are simultaneously analyzed using solid-phase ...

Oct. 2, 2014

By Shimadzu Scientific Instruments Inc

Analysis of Multi-Pesticide Residues in Vegetables, Food, and Fruits by SPE/GC-MS

Cleanup of matrices is the first, the most important, and the most critical step for both broad-spectrum screening and accurate determination of pesticides and their metabolites in vegetables,meats, drinks and fruits. In most cases, solid phase extraction (SPE) methods are used to clean up the extracts before the GC-MS analysis. The ideal SPE material(s) should remove the greatest number of food ...

Jan. 18, 2012

By MilliporeSigma

Quantification of <italic>umu</italic> genotoxicity level of urban river water

Quantification of umu genotoxicity level of urban river water

In recent years, the request of environmental safety management for carcinogenic substances, mutagenic substances and/or reproductive toxicity substances (CMR) has increased. This study focused on clarifying the genotoxicity level of environmental water and its release source by using the umu test provided in ISO13829. Although a genotoxicity index “induction ratio (IR)” is used in ISO13829, we ...

Jan. 1, 2011

By IWA Publishing

A colorimetric microwell method for determining bromide concentrations

Bromide is commonly used as a tracer in studies of water and chemical transport in soil and rock because it is relatively nonreactive with soil and rock constituents and because of its low environmental background concentrations. Based on a largely ignored modification of an American Public Health Association standard colorimetric method for determining Br– using phenol red and chloramine-T(CT), ...

Jun. 23, 2009

By Soil Science Society of America (SSSA)

High-Performance Liquid Chromatography for Determination of N-Nitrosodimethylamine in Water

High-performance liquid chromatography (HPLC) was applied for aqueous determination of Nnitrosodimethylamine (NDMA). A fluorescence derivatization technique was adopted to enhance detection using HPLC. Derivatization with dansyl chloride was optimized for excitation and emission wavelengths (340 and 530 nm, respectively), pH (9-12), and concentration of dansyl chloride (500 mg/L). An instrumental ...

Oct. 21, 2006

By Water Environment Federation (WEF)

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