Abstract:

Aqueous geochemical parameters are reported from Louisiana marsh water. Raw water samples were collected and analyzed as a component of a longitudinal study, from May 2015 to October 2016. Field data measured at the time of sample collection are reported separately and are available under GRIIDC Unique Dataset Identifiers (UDIs) R4.x264.198:0001, R4.x264.198:0004, R4.x264.000:0063, and R4.x264.000:0064.

Suggested Citation:

Engel, Annette Summers, Paterson, Audrey. 2019. Aqueous geochemistry of Louisiana marshes from 2015-05-12 to 2016-10-15. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-7p93-4v55

Purpose:

To report the major cation and anion chemistry of marsh surface water in May 2015, October-December 2015, May-June 2016, October 2016.

Data Parameters and Units:

MIMS ID: User-defined identifier assigned to each sample; Latitude, Longitude: Coordinates of the sample location (Latitude-decimal degrees, Longitude-decimal degrees); Collection date (DD-Mon-YYYY): Date the sample was collected in the field; Sample Description: Brief description of sample location and sample depth; Geographic Location Name: a geographic description of the sampling site; Salinity (ppt): Salinity of the surface water samples, in parts per thousand; Concentration of seven ions (mg/L).

Methods:

Surface water samples from marshes were collected biannually from May 2015 to October 2016. One-liter grab samples were collected at each field site, approximately 3-5 meters offshore from the marsh edge. Samples were collected and stored in certified HDPE bottles, transported on ice until frozen at -20 degrees C in the laboratory. For laboratory sample processing, samples were thawed, sonicated in the collection bottles for 10 minutes, and filtered through 0.22 micron PES Sterivex filters (EMD Millipore Cat. No.: SVGP01050) into prepared HDPE bottles for cation and anion measurements. Cation samples were preserved by acidification with nitric acid. Anions were not chemically preserved. Cation and anion bottles were stored at 4 degrees C until measurements were done using ion chromatographs.

Instruments:

Concentrations of major cations were determined on preserved (acidified) filtered samples using a Thermo Scientific ICS-2100 Integrated Reagent-Free ion chromatography system. Concentrations of major anions were determined on unpreserved, filtered samples using a Dionex ICS-2000 ion chromatography system. Cation and anion data were analyzed using Chromeleon 6.8 software. Cation concentrations were calibrated using a prepared Six Cation Standard (Thermo Scientific Product No.: 040187). Anion concentrations were calibrated using prepared Combined Seven Anion Standard II (Thermo Scientific Product No.: 057590) and Seven Anion Standard (Thermo Scientific Product No: 056933).

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