Synthetic soil blends were exposed to dense chlorine (Cl 2 ) plumes released at Dugway Proving Ground, UT, during Spring 2010 with the purpose of determining the magnitude of Cl 2 deposition onto soil and assessing its potential for attenuating a high-concentration plume. Samples were exposed at varying distances from the release point to include exposure to the pooling liquid (2–3m) and dense vapor (10–17m). Following exposure, soil samples were cored, fractionated vertically and analyzed for chloride (Cl – ) to quantify the integrated amount of Cl 2 deposited. Cl − was detected as deep as 4cm in samples exposed to dense Cl 2 vapor and in the deepest fractions (13cm) of samples exposed to liquid Cl 2 . Chloride concentration, [Cl – ], in the soil samples positively correlated with soil mass fractions of organic matter and water, and while their individual contributions to Cl 2 deposition could not be quantitatively determined, the data suggest that organic matter was the primary contributor. [Cl – ] results from the top vertical fractions (1.3cm nearest the surface) were used in an analysis to determine the magnitude of deposition as a loss term under low-wind (≤1.6m/s) conditions. The analysis revealed up to 50% of a 1814-kg release could be deposited within 20m from the release point for soil with high organic matter (43%) and/or water content (29%).
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
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