Comparison of soil-to-water suspension ratios for determining electrical conductivity of oil-production-water-contaminated soils

Canadian Journal of Soil Science - Tập 96 Số 2 - Trang 233-243 - 2016
Aaron W. Klaustermeier1,2, Hannah Angie Kelsey Tomlinson3,1, Aaron Lee M. Daigh1,2, Ryan F. Limb3,1, Thomas M. DeSutter1,2, Kevin K. Sedivec3,1
1North Dakota State University, Range Science Department, Fargo, ND 58108, USA.
2North Dakota State University, Soil Science Department, Fargo, ND 58108, USA.
3Dakota State University, Soil Science Department, Fargo, ND 58108, USA.

Tóm tắt

Soil salinity caused by oil-production-water (brine) contamination is a major issue in regions of oil and gas development. However, rapid site assessment tools such as soil-to-water suspension electrical conductivity (EC) methods and conversion equations have not been previously calibrated and validated for brine-contaminated soils. Our objective was to compare three soil EC methods and derive conversion equations for EC values commonly observed at brine-spill sites. Brine-contaminated soils from western North Dakota were assessed for salinity. Electrical conductivity was determined using 1:1 and 1:5 soil-to-water suspensions (EC1:1, EC1:5) and saturated paste extracts (ECe). Soil EC equilibration times for soil-to-water suspensions were also assessed. Significant relationships (r2 = 0.91 to 0.97, P < 0.0001) existed among all methods for EC values ranging between 0 and 126 dS m−1. Conversion equations were developed based on these relationships and then validated with an independent data set. These new equations reduced ECe prediction errors by 2 to 4.5 times when compare with 14 predictive equations reported in the literature. The conversion equations developed here are recommended for use in remediation efforts when converting EC1:1 and EC1:5 data to ECe on brine-contaminated and noncontaminated soils where ECe is highly correlated to Na concentrations.

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Canadian Journal of Soil Science

Tập 96 Số 2

233-243

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