Abstract:

Data includes field notes and device measurement raw data obtained during experiments to test concentrations of Atrazine, Chlorothalonil, & Fipronil in a Mississippi River-influenced marsh in southern Louisiana. The data was obtained using the Masterflex L/S DC power drive pump and the C-I- Agent C-18 filter and pre-filter. Filters were analyzed in a lab using gas chromatography/mass spectrometry (GC/MS).

Suggested Citation:

Bui, Linda M.. 2019. Method development data for determination of environmental concentrations of Atrazine, Chlorothalonil, Fipronil and Bifenthrin in a Mississippi River-influenced marsh in southern Louisiana from 2016-06-22 to 2016-10-08. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-zb0x-1g94

Purpose:

To test concentrations of Atrazine, Chlorothalonil, & Fipronil in a Mississippi River-influenced marsh in southern Louisiana.

Data Parameters and Units:

File "R4.x264.000-0079_Pesticide_Raw_Data_Archive_sub1.xlsx contains data on the chemical analysis of samples obtained from the field for pesticide concentrations. While different identifiers are used for field sampling and for analysis with gas chromatography/mass spectrometry (GC/MS), both identifiers are reconciled in the worksheet “Pesticide concentrations”. Hence, the GC/MS data for a particular field sample can be tracked using this worksheet. worksheet "Retention Times": Retention times (the point in the GC run at which the peak used to identify the chemical is found) for various compounds used in the experiment, expressed in minutes. ION (m/z): the mass (m) and charge number (z) of ions (mass: charge ratio) viewed as a peak on the chromatogram at the reported retention times (confirms the identification of the compound). Worksheet "GC Runs": Data from individual gas chromatograph runs, organized by user-defined descriptor headers. Data for Atrazine, Chlorothalonil, Bifenthrin, TPP (Triphenyl phosphate), Fipronil, Captan D6, and Phenanthrene-d10, are unit-less, expressed as the area under the curve on the graph. Note that as the experiment progressed, Bifenthrin (pesticide), TPP (a surrogate standard), and Captan D6 (an internal standard) were excluded from analyses. Dashes (-) in cells indicate below the detection limit, numbers with brackets ([]) indicate a response lower than the desired signal to noise ratio of (1:4), numbers with (MI) indicate that the data were manually integrated. Worksheet "Pesticide concentrations": Concentration data for the targeted compounds. Worksheet "Abbreviations": A key to abbreviations used in the sample analyses. File R4.x264.000-0079_Field Notes_sub1.xlsx contains environmental data from field collections. Data are organized on worksheets by dates. Variables include coordinates (latitude and longitude in degree minutes), air temperature (degC), water temperature (degC), salinity (ppt), dissolved oxygen (ppm), volume (mL), time elapsed (min), and flow rate (mL/min).

Instruments:

Chemical analyses were performed using an Agilent 6890 gas chromatograph (GC) equipped with an Agilent 5973 mass selective detector (MSD) and fitted with a Zebron-5MS high-resolution capillary column (30 m long x 250 mm diameter x 0.25-micron thick film). The carrier gas was ultrahigh purity helium (Air Liquide; Houston, TX) at a constant flow rate of 1 ml min-1. An Agilent 7693 autosampler was used for making splitless injections. The injector port was set at 280°C and was fitted with an Agilent deactivated borosilicate liner.

Individual Files: