Supporting Data QC Field Spikes SW NAWQA 2012-2015

Publication Date

2017-06-30

Start Date

2012-12-03

End Date

2015-09-10

Nowell, L.H., Moran, P.W., Schmidt, T.S., Norman, J.E., Nakagaki, Naomi, Shoda, M.E., Mahler, B.J., Van Metre, P.C., Stone, W.W., Sandstrom, M.W., and Hladik, M.L., 2017, Pesticides in Weekly Water Samples from the NAWQA Midwest Stream Quality Assessment (2013): U.S. Geological Survey data release, https://doi.org/10.5066/F7Z899M8.

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The field spike data were collected to evaluate pesticide recovery from the time of field sampling through final analysis at the laboratory, as part of U.S. Geological Survey (USGS) sampling of rivers and streams in the National Water Quality Assessment project (NAWQA). These data provide information on analytical method performance in surface water field matrices for Schedule 2437, analysis of pesticides in filtered water by direct injection liquid chromatography with tandem mass spectrometry (LC-MS/MS), at the USGS National Water Quality Laboratory. These data are used to supplement the quality control data collected for the 2013 Midwest Stream Quality Assessment (MSQA) study, which had no usable field spike samples because a faulty spike solution was used to prepare the MSQA field spikes. The same water sampling procedures and analytical method (Schedule 2437) to determine pesticides in water were used at the sites in this dataset, and in the MSQA study. The time period for this dataset (December 2012-September 2015) brackets the MSQA study (May-August 2013).

• National Water-Quality Assessment Project

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