Filters: Tags: Gas Chromatography (X) > partyWithName: Michael S Gross (X)

Filters Date Range Past year (2) Past month (0) Past week (0) Past day (0) Custom range... To   Search Contacts Gabrielle P Black California Water Science Center U.S. Geological Survey Michelle L Hladik U.S. Geological Survey - ScienceBase More... Categories Data (3) Tag Types Theme (3) Place (1) Harvest Set (3) USGS Scientific Topic Keyword (2) Tag Schemes USGS Thesaurus (2) National Agricultural Library Thesaurus (2) None (2) ISO 19115 Topic Category (3) Common Geographic Areas (1) Marine Realms Information Bank (MRIB) keywords (1) View Results as: JSON ATOM CSV

Current-use pesticides in tree swallow (Tachycineta bicolor) prey Analysis of biological tissues or direct sources of food may better characterize exposure of non-target organisms to current-use pesticides. Food boluses were collected from tree swallow (Tachycineta bicolor) nestlings using a non-lethal, ligature method and were composited based on nest. The ligatures, which prevented the bolus from being swallowed, were placed on nestlings for 1 h until samples were collected. Samples in 2016 were collected from nestlings at 6 days and 12 days post-hatch whereas 2018 samples were collected from nestlings at 12 days post-hatch. Furthermore, in 2016 and 2018, insects commonly consumed by tree swallows were collected via sweep net and composited based on suborder (Brachycera, Nematocera,... Categories: Data; Tags: Burr, Colonsay, Environmental Health, Humboldt, North America, All tags... Prairie Pothole Region, Prairie Pothole Region, Saskatchewan, St-Denis, Tachycineta bicolor, USGS Science Data Catalog (SDC), bolus, environment, gas chromatography, high performance liquid chromatography, insects, mass spectrometry, nestlings, pesticide residues, Fewer tags Multiresidue extraction of current-use pesticides from complex solid matrices using energized dispersive extraction with analysis by gas and liquid chromatography tandem mass spectroscopy A multiresidue method for solids (i.e., soil, sediment, sludge) was developed and evaluated for the analysis of pesticides and pesticide degradates. Initially, a well characterized soil was used to determine the recovery of target compounds using an Energized Dispersive Guided Extraction (EDGE) system with two extraction solvents, acetonitrile and 1:1 (v/v) hexane:acetone. Extracts were cleaned using solid-phase extraction (SPE) with graphitized carbon cartridges and three elution solvents, acetonitrile, dichloromethane, and 1:1 (v/v) dichlormethane:ethyl acetate. The individual SPE elutions from the two extraction solvents were analyzed separately via GC-MS/MS and LC-MS/MS for 210 pesticides and pesticide transformation... Categories: Data; Tags: Environmental Health, USGS Science Data Catalog (SDC), biosolids, contaminant transport, environment, All tags... gas chromatography, liquid chromatography, mass spectrometry, pesticide and herbicide contamination, sediment, soil, Fewer tags A Multiresidue Method for the Analysis of Pesticides in Water using Solid-Phase Extraction with Gas and Liquid Chromatography-Tandem Mass Spectrometry (ver. 2.0, April 2023) Applications of pesticides in agricultural and urban settings play an essential role in increasing crop yields, preserving food and materials, reducing pest-borne diseases, and eradicating or deterring pests. Pesticides are transported from their point of application to environmental media, including surface water. To better understand the fate of fate and transport of pesticides in the environment, analytical methods are necessary to measure pesticides in waters. Herein, a method is described for the extraction and analysis of pesticides and pesticide degradates in filtered surface water and paired suspended sediment samples. Water samples (~ 1 L) are filtered using 0.7 μm glass-fiber filters prior to being extracted... Categories: Data; Tags: USGS Science Data Catalog (SDC), environment, gas chromatography, liquid chromatography, mass spectroscopy, All tags... pesticide and herbicide contamination, pesticides, water quality, Fewer tags