Environmental Laboratory - Focus on Pesticide Analysis
Neonicotinoids Standards Available
A group of systemic agricultural insecticides resembling nicotine in structure and mechanism of action. They act on the central nervous system of
insects by binding to nicotinic acetylcholine receptors. They are considered safe for household use as they tend to have low affi nity for vertebrates. This class of pesticide moves through the plant starting from seed growth and therefore is present in all the plant tissues. This results in non-targeted insects being exposed even if the chemical is applied at a later date. The most widely used neonicotinoid is Imidacloprid, a common ingredient in garden insecticides.
More information on Imidacloprid and many other neonicotinoids are available on the Chem Service (USA) website.
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GC Column Set for Chlorinated Pesticides Runs Seven EPA Methods
Phenomenex Inc. (USA), a global leader in the research and manufacture of advanced technologies for the separation sciences, introduces Zebron ZB-CLPesticides-1 and 2 for dual-column pesticide testing by GC/ECD (electron capture detection). This column set saves time and money for chlorinated pesticide testing commonly performed by environmental and drinking water testing labs, which often need to run up to seven EPA methods on a single instrument. To carry out this testing, labs typically need to perform multiple, time-consuming column changes which negatively impacts productivity. The Zebron ZB-CLPesticides GC column set, which contains two phases with orthogonal selectivities specifi cally optimized for pesticide analysis, runs all seven methods. These new columns expand the Phenomenex Zebron family of products for GC pesticide testing, which also includes ZB-SemiVolatiles and ZB- MultiResidue-1 and 2.
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New GC Column Line Launched for Applications Including Pesticide Analysis
To remain healthy, it is necessary to eat a wide variety of foods, particularly fresh fruit and vegetables. Although pesticides play vital roles in protecting food crops from pests (e.g. fungal diseases and insects), there is concern about the potential levels of pesticide residues in the edible produce. Examples of chemically-related pesticides include:
* Organophosphates - affects the nervous system by disrupting the enzyme cholinesterase that inactivates the neurotransmitter, acetylcholine
* Carbamates – blocks the activity of cholinesterase
* Organochlorines - commonly used in the past, but many have been removed from the market due to their health and environmental effects and their persistence (e.g. DDT and chlordane)
* Pyrethroids - act on sodium channels in the nervous system to disrupt action potential propagation
Indeed, government’s legislation sets strict limits on the concentrations of residual pesticides and their metabolites in fresh food.
Most countries’ pesticide programs are made up of three components: Regulatory surveillance of domestic and imported food, total diet studies and monitoring. Each food group can have more than 30 individual tolerances. For example, grapes have more than 70 individual strict tolerances ranging from 0.05-60 ppm for a particular pesticide. Thus, it is vital to have reliable analytic techniques to measure residual pesticide levels in a wide variety of foods.
The QuEChERS method (Quick, Easy, Cheap, Effective, Rugged and Safe) is an easy and cost effective way for analytical chemists to determine the levels of pesticide residues in many types of food. The original QuEChERS method was modifi ed to ensure that pH dependent chemicals could be effi ciently extracted to minimize their degradation (e.g. base and acid labile pesticides) and also to facilitate the detection of many more types of compounds.
Testing laboratories must possess pesticide reference standards of known quality and concentration as well as samples of all their known metabolites - this is the fi rst requisite. The PerkinElmer (USA) Supra-d QuEChERS dispersive method turns sample preparation into an easy two-step process by using the QuEChERS method, which is the most popular sample preparation technique used to analyse pesticide residues. It is useful in that it eliminates complex liquid extraction methods and extends the range of the recovered pesticides.
The QuEChERS procedure is fast and easy, improving lab productivity and results in fewer errors. Food samples (fruits, vegetables, tobacco, etc.) are initially homogenized in a blender. The prepared samples are then placed in centrifuge tubes with a detection reagent and agitated for 60 seconds. The reagents used obviously depend on the type of samples to be analysed. Then, each sample is put through a cleanup column prior to analysis by gas-liquid chromatography. Thus, samples can be processed quickly using the QuEChERS method.
To analyse large numbers of samples whose pesticide treatment history is usually unknown, analytical methods are used that are capable of simultaneously determining a number of pesticide residues. These multi-residue analysis techniques can measure the levels of approximately half of the approximately 400 pesticides within the required government tolerances, and many others that have no tolerances. Numerous other analytic methods available to determine a wide range of pesticide levels in food are documented by the U.S.
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“Today’s pesticide testing labs are driven to deliver precise results faster but with less resources,” explains Kristen Parnell, brand manager for GC products at Phenomenex. “ZB-CLPesticides columns allow chemists to save time and gain fl exibility by running multiple pesticide classes on one GC/ECD instrument, on one column pair, as opposed to traditional setups that require time-consuming and costly column switches per method.”
Zebron ZB-CLPesticides-1 and 2 columns also offer a direct, drop-in alternative to Restek chlorinated pesticides columns. The columns are available individually or packaged in a kit, which also contains a 5-meter guard column, Y-connector and polyimide resin.
Joanne Foy, a chemist at TriMatrix Laboratories, is an early user of the new Zebron columns. “I was able to install the ZB-CLPesticides-1 and ZB-CLPesticides-2 columns as direct replacements for the Restek Rtx- CLPesticides and Rtx-CLPesticides2 columns that I currently use and made no changes to the method,” Foy commented.
Phenomenex offers online, 24/7 support for pesticides analysis along with application and method development services and certifi ed reference materials for calibration.
New GC Column Line Launched for Applications Including Pesticide Analysis
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Shimadzu (Germany) is expanding its product portfolio of accessories and consumables by introducing a series of high-quality GC capillary columns. In this way, Shimadzu perfects the objective of providing full solutions to its customers.
The wide range of SH-columns offers more than 40 different types of stationary phases in various dimensions. Standard polarities like 1, 5, WAX or 624 as well as columns for specifi c applications like pesticide analysis always provide a suitable choice for your applications. Customers will benefi t from the perfect match of state-of-the-art gas chromatography columns and high-end GC/GC-MS instruments from a single source.
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57
Uncover the
Unseen in the Green Supel™
QuE Verde for QuEChERS • Remove >95% of pigment interferences
• Attain >70% recovery of even the most challenging planar pesticides
Learn more and request a sample at
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©2016 Sigma-Aldrich Co. LLC. All rights reserved. SIGMA-ALDRICH is a trademark of Sigma-Aldrich Co. LLC, registered in the US and other countries. Supel is a trademark of Sigma-Aldrich Co. LLC. Sigma-Aldrich Corp. is a subsidiary of Merck KGaA, Darmstadt, Germany.
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5/23/16 2:33 PM
www.envirotech-online.com IET Annual Buyers’ Guide 2016/17
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