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Breakthrough curves of 50NPs (a,b,e,f,i,j) and 400NPs (c,d,g,h,k,l) cotransport with different DOM with different concentrations in the 0.2 (a,b,e,f,i,j) and 2% (c,d,g,h,k,l) GT-coated 70 μm (a,c,e,g,i,k) and 338 μm (b,d,f,h,j, l) sand columns at an influent pH of 6.0. Symbols indicate observed data and solid lines indicate simulation fitting. Recovery rates of <5% in the effluent did not fit.
