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- W2131382562 abstract "Although strongly adsorbing ions are relatively immobile within porous media, preferentialflow and adsorption to mobile colloids can enhance their transport. There is limited knowledgeregarding the role of preferential flow and colloidal transport on adsorbing ions. The goal of thisresearch is to determine the influence of preferential flow paths and colloids on transportation ofadsorbing ions. The movement of a conservative tracer within soil by preferential flow has beenstudied in previous research at a west Tennessee field plot and results demonstrate rapid transportof the tracer. Eight soil monoliths with a diameter of 0.3 m and a length of 1.0 m were excavated andcollected in PVC pipes from the Ames Plantation, near Grand Junction, Tennessee. The monolithswere transported to the laboratory where a column experiment was performed to determine thetransport rate of an adsorbing and non-adsorbing ion. Four monoliths were treated with poultry litter,and the other four monoliths were treated with inorganic fertilizer. Fertilizer was applied atcongruence to the recommended Nitrogen rate of 168 kg ha-1. Water spiked bromide as KBr, whichbehaves as a conservative tracer, was applied daily to the surface of all monoliths at a constantconcentration of 20 ppm d-1. Fiberglass wicks sampled water moving through the matrix, and waterdripping from the base of the column, indicative of preferential flow, was collected using a brassnipple. Concentrations of total phosphorus, inorganic phosphorus, organic phosphorus, and bromidewere measured. The transport of P from preferential flow and matrix flow of a monolith werecompared by constructing breakthrough curves for the brass nipple and fiberglass wicks. A portionof the effluent samples were filtered with 0.45 and/or 0.1 mm nylon filters to reveal the role colloidsplay in ionic transport. P concentrations were relatively higher in the free water compared to thematrix water, indicative that when preferential paths are present P adsorption is decreased.Monoliths with early detection of Br also had elevated P concentrations. Leachate samples from thefiberglass wicks had lower Br concentrations than leachate samples from the brass nipple.Comparisons between the inorganic and organic fertilizer effects on P transport are inconclusive atthis time. Additional studies on the monoliths are ongoing." @default.
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- W2131382562 date "2004-01-01" @default.
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- W2131382562 title "Preferential Flow and Colloids: Their Influence on the Transport of Phosphorus" @default.
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- W2131382562 doi "https://doi.org/10.13031/2013.17077" @default.
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