Pesticide adsorption and degradation in fine earth and rock fragments of two soils of different origin

Costantino Vischetti, Laura Coppola, G Corti, E Monaci, S Cocco, A. Agnelli

Research output: Contribution to journalArticle

15 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)348-352
Number of pages5
JournalGeoderma
Publication statusPublished - 2010

Keywords

  • Adsorption
  • Degradation
  • Pesticides

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