carbamate analysis Articles
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ChlorAC Buffer
Introduction Trace analysis of carbamate insecticide residues in water is a routine requirement in the U.S. Since several of the common carbamates — Carbaryl, Oxamyl, Hydroxycarbofuran — are labile in water due to oxidation or hydrolysis, the samples and standards must be preserved in order to obtain valid results. USEPA Method 531.1 specifies pH adjustment, dechlorination, and cold ...
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Expanded HPLC Method for N-Methyl Carbamates post-column analysis of pesticides in food and potable water samples
Carbamate pesticides are widely used around the world to protect crops. In addition, they are used as biocides for industrial or other applications and in household products. Though carbamates are biodegradable compounds and bioaccumulation usually happens only to a low extend it is important to monitor produce to make sure enough time has elapsed between harvest and applying pesticides. Also, ...
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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, ...
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o-Phthalaldehyde Reagent
Introduction Primary amines form highly fluorescent adducts when reacted with o-Phthalaldehyde (OPA) and a mercaptan under basic conditions. At a pH>9 and ambient temperature, reaction is generally complete within 30 seconds. The products of this reaction, 1-alkyl-2-alkylthio-substituted isoindoles, exhibit optimal excitation at 330 nm and maximal emission at 465 nm. The reagents described ...
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Pinnacle PCX Carbamate Testing at Nebraska Health
Beta Site Evaluation of the EPA Carbamate in Drinking Water Method 531.1 with Pickering Laboratories Pinnacle PCX Integrated LC/Post-Column Derivatization Instrument. The Nebraska DHHS Public Health Environmental Laboratory conducts environmental testing for the state of Nebraska. It employs mandated U.S. Environmental Protection Agency (EPA) methods for the determination of regulated substances ...
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Co‐extracted dissolved organic carbon has a suppressive effect on the acetylcholinesterase inhibition assay
The acetylcholinesterase (AChE) inhibition assay is frequently applied to detect organophosphates and carbamate pesticides in different water types, including dissolved organic carbon (DOC) rich wastewater and surface water. The aim of the present study was to quantify the effect of co‐extracted DOC from different water samples on the commonly used enzyme based AChE inhibition assay. ...
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