Fig. 4From: Degradation and sorption of the herbicide pelargonic acid in subsoils below railway tracks compared to a range of topsoilsAdsorption isotherms of pelargonic acid-D17 in 3 soils from railway tracks (top left panel) and 12 topsoils (all others). cs: amount adsorbed to soil, cw: concentration in solution. Note the different scales. The shaded areas are the 95% confidence intervals for the fitted curves. The open symbol (soil Sargans) is considered an outlierBack to article page