Research Chemist
California Water Science Center
Email:
mhladik@usgs.gov
Office Phone:
916-278-3183
Fax:
916-278-3070
ORCID:
0000-0002-0891-2712
Location
California District Office - Placer Hall
Placer Hall
6000 J Street
Sacramento
, CA
95819-6129
US
Supervisor:
Joseph L Domagalski
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Neonicotinoids have become the most widely used insecticides in world with rapid growth in applications as seed coatings. Nontarget organisms are exposed to concentrated levels of pesticidal active ingredients through ingestion of treated seeds. To better understand pesticide fate, analytical methods are necessary to rapidly screen and accurately quantitate contaminants in environmental and biological matrices. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) is commonly employed for neonicotinoid analyses but requires expensive analytical instrumentation and potentially laborious sample preparation. Enzyme-linked immunosorbent assays (ELISAs) are efficient and sensitive alternative methods for neonicotinoid...
Categories: Data;
Tags: Coturnix japonica,
Environmental Health,
USGS Science Data Catalog (SDC),
United States,
environment, All tags...
enzyme-linked immunosorbent assay,
high performance liquid chromatography,
mass spectrometry,
metabolites,
neonicotinoid insecticides,
pesticide residues, Fewer tags
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This data release contains the concentration and quality-assurance results for inorganic constituents, as well as organic compounds (volatile organic compounds [VOC], per- and polyfluoroalkyl substances [PFAS], pesticides and disinfection byproducts [DBP]) and microbiological results collected in the Little Big Horn River and residential or commercial tapwater locations in Montana. Twenty-two tapwater samples (six sourced from public supply and 14 sourced from private wells) and six surface-water samples were collected in Montana between August 8-10, 2022. Pharmaceuticals, VOC, and PFAS were analyzed at the U.S. Geological Survey (USGS) National Water Quality Laboratory (NWQL) in Denver, Colorado. Pesticides and...
Categories: Data;
Tags: Environmental Health,
Montana,
USGS Science Data Catalog (SDC),
United States,
Water Quality, All tags...
drinking water use,
environment,
environmental health (human),
geoscientificInformation,
health,
inorganic analytes,
organic contaminants,
point-of-use exposure,
surface water,
tapwater,
water quality, Fewer tags
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These data present chemistry and toxicity results from freshwater stream sediments collected from 99 wadable stream sites across eleven states in the Midwestern U.S. as one component of a larger USGS study in the summer of 2013. This data presents a selected suite of chemistry collected at these sites (PAHs, Organochlorines, PCBs, Trace Elements, and current use pesticides) used in calculating a Probable Effect Concentration-Likely Effect Benchmark quotient mixture score for contaminants measured in sediments. The toxicity data presents results of toxicity tests following ASTM and US EPA standard methods for sediment toxicity tests with the amphipod Hyalella azteca (28-d exposure), the midge Chironomus dilutus (10-d),...
Categories: Data;
Types: Citation;
Tags: Illinois,
Indiana,
Iowa,
Kansas,
Kentucky, All tags...
Michigan,
Minnesota,
Missouri,
Nebraska,
Ohio,
South Dakota,
USGS Science Data Catalog (SDC),
Water Quality,
Wisconsin,
chemistry,
invertebrates,
monitoring,
pesticides,
pollution,
sediment,
toxicity, Fewer tags
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Irrigation runoff and soil samples were collected from a lettuce field located at the USDA-ARS Spence Research farm in the Salinas Valley, California to measure neonicotinoid insecticides (clothianidin and imidacloprid) and a fungicide (azoxystrobin) applied via coated seed and drench treatments. The field trial was designed to evaluate four treatments with replication: 1) control, untreated seed, 2) imidacloprid treated seed, 3) clothianidin treated seed, and 4) azoxystrobin treated seed with an imidacloprid drench. Samples were collected from each treatment over two lettuce growing seasons: August to October 2019 and September to October 2020. Runoff samples were collected over both growing seasons during 6 irrigation...
Categories: Data;
Tags: California,
Salinas,
Soil Sciences,
USGS Science Data Catalog (SDC),
Water Quality, All tags...
Water Resources,
contamination and pollution,
environment,
fungicides,
insecticides,
irrigation,
pesticide and herbicide contamination,
pesticides,
seed treatment,
soil drenching,
soil resources,
surface water quality, Fewer tags
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This data release includes sampling location data, field-collected wetland attribute data, field-collected water chemistry data, laboratory-processed water chemistry data (anions, cations, alkalinity, nutrients, chlorophyll a concentrations, dissolved organic carbon, and specific ultraviolet absorbance, pesticide concentrations), dry mass of adult aquatic insects emerging from the surface of the wetlands, taxonomic classifications of the insects collected, and whole-body pesticide concentrations for adult aquatic insects emerging from wadeable wetlands in cropland and grassland landscapes across a salinity/hydrology gradient (N = 14 wetlands in 2015, N = 15 wetlands in 2016). Sampling was completed in late spring,...
Tags: Agriculture,
Aquatic Biology,
Aquatic Insects,
Aquatic-terrestrial linkages,
Current use pesticides, All tags...
Emergence,
Emergence traps,
Environmental Health,
Food web,
Imidacloprid,
Metamorphosis,
North Dakota,
Pesticides,
Prairie Pothole Region,
Stutsman County,
USGS Science Data Catalog (SDC),
Wetland,
biota, Fewer tags
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