Fig. 6

Double-logarithmic graphs of emission curves for diuron, terbutryn and OIT from paint B for a field and b laboratory experiments at BAM. The dotted lines represent lines with a slope of 0.5. These lines indicate diffusion-controlled processes. For explanation, diffusion proceeds proportional to the square root of time, i.e. diffusion ~ time^0.5. The exponent 0.5 becomes factor 0.5 in logarithmic functions. It is assumed that the amount of runoff represents certain duration of water contact. The number of immersion cycle represents duration of water contact, i.e. each immersion cycle includes 2 h of water contact