Description the soil buffering disturbance in pesticides polluted soils
Imre Czinkota1, Rita Foldenyi, Livia N. Konda, Laszlo Tolner2, Attila Kovács3
1 imre.czinkota@gmail.com
2 tolner.laszlo@gmail.com
3 Budapest, Tarnok street 26, - Hungary
The soil's recharge ability plays an important role in the bioavailability of compounds necessary for plants. On one hand these compounds are taken away from the soil solution by plants, while on the other hand ground water removes them, causing decrease in amount and concentration. The buffer capacity of a compound referring to a given soil uniquely determines the effective diffusion, mass flow and bioavailability of the compound. This quantity is given by the first derivative of sorption isotherms as a function of the equilibrium concentration. If the measured as well as the modeled multistep isotherms are considered the resulting function will form a wave-shaping like function. The common properties of these functions that the maximal values can be even ten times larger than the minimal values in the 5 to 10 % interval of the whole soluble pesticide concentration. These results are shed some light on new problems, which have not been investigated up to now. Explicitly, the small differences in the measured concentrations can cause ten times differences in the amount of pesticide in the soil. Even the tolerance of the soil capacity against disturbances can change by a magnitude in the mentioned interval.
Presenting author: M Imre Czinkota, imre.czinkota@gmail.com