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    • Supporting Data QC Field Spikes SW NAWQA 2012-2015

    Metadata Updated: January 7, 2026

    Field spikes were prepared at 207 stream and river sites as part of the U.S. Geological Survey (USGS) National Water Quality Assessment (NAWQA) project between December, 2012, and September, 2015. At the field site, a depth-and width-integrated environmental sample was collected, and one subsample of the environmental sample was spiked with a known amount of a spike mixture. Both the spiked subsample ("spike sample") and another subsample ("environmental sample") of the original water sample were analyzed for pesticides at the USGS National Water Quality Laboratory (NWQL) by direct injection liquid chromatography with tandem mass spectrometry (LC-MS/MS), and were used to calculate the spike recovery of each analyte. This dataset contains a summary of the spike recoveries for 221 pesticide compounds analyzed by LC-MS/MS at the NWQL in surface water field matrices collected during the period from Dec 2012 to Sept 2015.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Created Date January 7, 2026
    Metadata Updated Date January 7, 2026

    Metadata Source

    Harvested from DOI USGS DCAT-US

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date January 7, 2026
    Metadata Updated Date January 7, 2026
    Publisher U.S. Geological Survey
    Maintainer
    Identifier http://datainventory.doi.gov/id/dataset/USGS_5928a857e4b016f7a93f8d7f
    Data Last Modified 2020-08-26T00:00:00Z
    Category geospatial
    Public Access Level public
    Bureau Code 010:12
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://ddi.doi.gov/usgs-data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id aaaa6dc4-1031-4f12-8166-4059b15cff6c
    Harvest Source Id 2b80d118-ab3a-48ba-bd93-996bbacefac2
    Harvest Source Title DOI USGS DCAT-US
    Metadata Type geospatial
    Old Spatial -168.04687499706, 23.845249705125, -63.984375001218, 71.05965579962
    Source Datajson Identifier True
    Source Hash 8063ab5175715b1be3713f346091ecae5bafc8d0f4bfa119789d08e2300a435e
    Source Schema Version 1.1
    Spatial {"type": "Polygon", "coordinates": -168.04687499706, 23.845249705125, -168.04687499706, 71.05965579962, -63.984375001218, 71.05965579962, -63.984375001218, 23.845249705125, -168.04687499706, 23.845249705125}

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