environmental sample Articles

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Fast analysis of semi-volatile organic compounds using PTV-GC–TOF MS

by SepSolve Analytical  (Jul. 29, 2016)

The evaluation of semi-volatile organic compounds (SVOCs) in environmental matrices poses many challenges for the analyst, not least the vast number that may be encountered in any given analysis. In addition, analyte reactivity and the potential for multiple analytes to co-elute makes achieving the required method detection limits (LODs or MDLs) ...

Impact of pH on Derivatization of Nitrophenol Compounds

by Restek Corporation  (Aug. 3, 2016)

Our goal of evaluating the Normalized French Environmental Method 12673 required testing the method’s ability to derivatize nitrophenols and alkylphenols in addition to the chlorophenols the method was designed for. Unfortunately, nitrophenols proved challenging to derivatize at low concentrations. In an effort to improve the derivatization ...

What is microflow?

by Waters Corporation  (Jul. 28, 2016)

What are the differences between micro-scale and conventional LC? Microflow (aka micro-scale) LC/MS has been widely applied to proteomic research for years.  Recently, as microflow LCMS systems continue to evolve, more and more laboratories in various fields are weighing the implications of applying this small-is-beautiful technology. In ...

Data Management and Visualization for Interim Measure Plan - Case Study

by Antea Group - USA  (Jul. 29, 2016)

Challenge Groundwater impact was discovered at the bedrock surface off-site and the client needed to quickly be able to access a long history of site data and develop a conceptual site model. Visually understanding where the impacted groundwater was in relation to property boundaries, surface water and stratigraphic features was critical for the ...

North Dakota Pipeline Release Data Collection and Communication - Case Study

by Antea Group - USA  (Aug. 10, 2016)

Challenge A North Dakota pipeline released an estimated 21,000 bbls of crude oil. Antea Group was challenged by the client to assemble a team of specialists capable of effectively and efficiently collecting and communicating extent and migration data to key stakeholders. Due to the magnitude of the spill, spatial and environmental data needed to ...

The Advantages of a Targeted 2D LC Approach

by Waters Corporation  (Aug. 10, 2016)

Webinar Highlights | Focus on the Relevant: The Advantages of a Targeted 2D Chromatography Approach Hi folks, I’m Daniel Root, Senior Product Marketing Manager for Multidimensional LC Systems at Waters. I recently conducted a webinar that addressed multidimensional liquid chromatography – an exceptional tool for the improvement of ...

Use of Oxygen Monitors for Nitrogen, Argon, or Cryogenics and Where They Are installed

by PureAire Monitoring Systems, Inc  (Aug. 19, 2016)

An oxygen deficiency monitor or O2 monitor is found in many settings where colorless, odorless gases -- including nitrogen, argon, CO2, and cryogenic gases -- are used. Always monitoring, the oxygen detector can tell when gas levels rise above those deemed safe, and let off a timely alarm. Learn which settings commonly use ...

Sustainable sampling of native bromeliads for environmental monitoring

by Inderscience Publishers  (Jun. 30, 2010)

By analysing the leaves of bromeliads, the availability of chemical elements in the atmosphere can be assessed. However, sampling steps affect the reliability of using such plants for environmental quality studies. This paper describes a novel and sustainable sampling methodology for conservation units, in which small discs (6 mm diameter) of ...

Concentration and solvent recovery of environmental samples in dichloromethane

by BÜCHI Labortechnik AG  (Feb. 2, 2015)

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 ...

Ambient Air Sampling Methods

by Perfect Pollucon Services  (May 3, 2015)

Pollutants are nothing but any substance that may present in an atmosphere in such a concentration that it may harmful to surrounding, living organism or human being. Sampling and analysis of air pollutants is known as Air quality monitoring and it is major part of environmental monitoring. There are many advanced types of ambient air ...

Decontaminating Groundwater Sampling Devices

by QED Environmental Systems  (Jan. 1, 1997)

These studies are the second part of a two year project that examines decontaminating groundwater sampling devices. In the first year, the efficiency of various decontamination protocols was tested using small test pieces of materials that are commonly used in groundwater sampling devices. Those tests showed that a hot detergent wash and rinse ...

Biodegradation Tests for Wastewater Samples

by Challenge Technology  (Jan. 1, 2003)

Biodegradation Tests for Wastewater Samples Biodegradation tests usually involve comparison of the oxygen uptake of a test sample – or gas production for anoxic or anaerobic tests – to that for a readily biodegradable control substrate (usually acetic acid, ethanol, or aniline). While biodegradation characteristics can vary among chemical types ...

Theoretical Considerations on the use of solid-phase microextraction with complex environmental samples

by Southern California Coastal Water Research Project Authority (SCCWRP)  (Jan. 1, 2002)

Untitled Document The equations governing the use of equilibrium solidphase microextraction (SPME) for environmental samples with complex heterogeneous matrices were derived in terms ...

A simple, efficient method for the separation of humic substances and DNA from environmental samples

by American Society for Microbiology  (Dec. 1, 1997)

Three different gels (Sepharose 4B, Sephadex G-200, and Sephadex G-50) were evaluated as a means of removing humic contaminants from DNA extracts of environmental samples. Sepharose 4B gave superior separation of DNA from humics, and DNA purified in this way showed consistently greater amplification than DNA purified by the other ...

Book Review: Field Sampling: Principles and Practices in Environmental Analysis

by Inderscience Publishers  (Jul. 31, 2006)

Field Sampling: Principles and Practices in Environmental Analysis, by Alfred R. Conkling Jr. Marcel Dekker, 2004. 354pp. ISBN 0-8247-5471-9Keywords: book ...

A new approach based on polynomial functions for measuring the acute toxicity of environmental samples

by Inderscience Publishers  (Jan. 30, 2007)

In this paper, a new mathematical approach for the estimation of acute toxicity in environmental samples is proposed. The concentration of pollutant or the amount of sample producing the inhibition of 50% of the living organisms used for the test (EC50) is determined by means of Polynomial Functions (PF) applied to the experimental x ...

An interlaboratory comparison study for the determination of dialkyl phthalate esters in environmental and biological samples

by John Wiley & Sons, Ltd.  (Jun. 15, 2012)

A series of interlaboratory comparison exercises were conducted to assess the accuracy of dialkyl phthalate ester (DPE) concentration measurements in environmental and biological samples. Five laboratories participated in analyses to determine DPE concentrations in standard test solutions; marine sediments; three certified reference materials ...

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

by Sigma-Aldrich Co., LLC  (Dec. 31, 1998)

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 ...

Determination of trace amounts of mercury (II) by catalytic kinetic method in environmental samples

by Inderscience Publishers  (Apr. 19, 2010)

A highly selective and sensitive, spectrophotometric method is developed for the determination of Mercury(II) in environmental waters samples, based on indicator reaction of potassium hexacyanoferrate(II) and 2-methylpyrazine (2-Mepz), catalysed by Hg(II). The reaction was monitored spectrophotometrically at pH = 3.50 ± 0.02 and 25.0 ± 0.1°C by ...

Book Review: Fundamentals of Environmental Sampling and Analysis by Chunlong Zhang

by Inderscience Publishers  (Nov. 21, 2008)

Fundamentals of Environmental Sampling and Analysis, by Chunlong Zhang. New York, John Wiley and Sons, 2007. 436pp. ISBN 978-0-471-71097-4Keywords: book ...

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