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.
Lingua originale | English |
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pagine (da-a) | 348-352 |
Numero di pagine | 5 |
Rivista | Geoderma |
Stato di pubblicazione | Pubblicato - 2010 |
Pubblicato esternamente | Sì |
Keywords
- Adsorption
- Degradation
- Pesticides