Thesoilskeleton(largerthan2mmfraction)canprovideasourceoforganiccarbonwhichmayrepresentan unexploredpossibilityof adsorbinganddegradingpesticides. Thepresentpaperreportsalaboratoryexperimentontheadsorptionofmetobromuronandterbuthylazine ontheskeletonandfineearthof twoItaliansoilsderivedfromtwoparentrocks, acalcareousmarl anda sandstone. KFvaluesof1.30and2.22formetobromuronand1.24and2.21forterbuthylazinewerefoundin thefineearthofsandstoneandcalcareousmarl, respectively. Surprisingly, thesoil skeleton, intendedasthe 2–10mmfraction, showedagoodadsorptioncapacityof about40%and20%withrespecttothefineearth fractionforsandstoneandcalcareousmarlsoils, respectively. ThederivedKocvaluesfortheskeletonturned outtobemuchhigherthanthoseofthefineearthindicatinganadsorptionactivityoforganiccarboninthe skeletonhigherthanthatof thefineearth. Pesticidedegradationfollowedfirstorderkineticsinall samplesandhalf-lifevaluesintheskeletonwerein thesamerangeas thoseinthefineearthdemonstratingabiodegradationactivityof this substrate. A degradationtrial insterilizedskeletonof thetwosoilssupportsthepreviousstatement, sincedegradation wasalmostabsent. The experiment performed indicated a possible contribution of the soil coarse fraction to pesticide adsorptionanddegradation, helpingintheirdisappearancefromtheenvironment.
Vischetti, C., Corti, G., Monaci, E., Cocco, S., Coppola, L., Agnelli, A., Pesticide adsorption and degradation in fine earth and rock fragments of two soils of different origin, <<GEODERMA>>, 2010; (154): 348-352 [http://hdl.handle.net/10807/8689]
Pesticide adsorption and degradation in fine earth and rock fragments of two soils of different origin
Vischetti, Costantino;Coppola, Laura;
2010
Abstract
Thesoilskeleton(largerthan2mmfraction)canprovideasourceoforganiccarbonwhichmayrepresentan unexploredpossibilityof adsorbinganddegradingpesticides. Thepresentpaperreportsalaboratoryexperimentontheadsorptionofmetobromuronandterbuthylazine ontheskeletonandfineearthof twoItaliansoilsderivedfromtwoparentrocks, acalcareousmarl anda sandstone. KFvaluesof1.30and2.22formetobromuronand1.24and2.21forterbuthylazinewerefoundin thefineearthofsandstoneandcalcareousmarl, respectively. Surprisingly, thesoil skeleton, intendedasthe 2–10mmfraction, showedagoodadsorptioncapacityof about40%and20%withrespecttothefineearth fractionforsandstoneandcalcareousmarlsoils, respectively. ThederivedKocvaluesfortheskeletonturned outtobemuchhigherthanthoseofthefineearthindicatinganadsorptionactivityoforganiccarboninthe skeletonhigherthanthatof thefineearth. Pesticidedegradationfollowedfirstorderkineticsinall samplesandhalf-lifevaluesintheskeletonwerein thesamerangeas thoseinthefineearthdemonstratingabiodegradationactivityof this substrate. A degradationtrial insterilizedskeletonof thetwosoilssupportsthepreviousstatement, sincedegradation wasalmostabsent. The experiment performed indicated a possible contribution of the soil coarse fraction to pesticide adsorptionanddegradation, helpingintheirdisappearancefromtheenvironment.
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