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Supporting Data QC Field Spikes SW NAWQA 2012-2015


Publication Date


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,


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 [...]


Point of Contact :
Lisa H Nowell
Process Contact :
Megan E Shoda
Originator :
Lisa H. Nowell, Megan E. Shoda, Wesley W. Stone, Mark W. Sandstrom
Metadata Contact :
Lisa H Nowell
Publisher :
U.S. Geological Survey
Distributor :

Attached Files

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Supporting_Data_QC_Field_Spike_SW_NAWQA_2013-2015.txt 25.14 KB text/plain
“Dan Button with isokinetic sampler, Massies Ck, OH”
thumbnail 85.13 KB image/jpeg


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).

Additional Information


Type Scheme Key
DOI doi:10.5066/F7Z899M8

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