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Diuron mineralisation in soil affected by the use of hydroxypropyl-ß-cyclodextrin and different amendments

AutorVillaverde Capellán, J. ; Rubio Bellido, Marina ; Madrid Díaz, Fernando ; Morillo González, Esmeralda
Fecha de publicación2013
CitaciónBook of abstracts of 14th EuCheMS International Conference on Chemistry and the Environment. ICCE 2013, Barcelona, June 25 - 28, 2013
ResumenResults on diuron mineralisation and adsorption-desorption on a soil artificially contaminated (50 mg kg-1), to which two different composted organic amendments (sewage sludge mixed with pruning remains, LDD, and domestic wastes, RSU), an inorganic amendment (micronutrients) and a hydroxypropyl-b-cyclodextrin (HPBCD) solution were applied, were obtained. Treatments were investigated at different amendment concentrations. From initial studies, the incapability of the endogenous soil microorganisms to mineralise diuron was confirmed. However, after the inorganic amendment was applied, with the aim of supplying essential nutrients for soil flora activation, a 5% of diuron mineralisation was reached after 150 days, concluding that the soil has a potential capacity to mineralise the herbicide through biostimulation-assisted natural attenuation. Diuron mineralisation was improved using a HPBCD solution at a very low concentration of only 10 times the diuron equimolar concentration in soil. This molecule is able to form diuron inclusion complexes, which provokes an increasing in its hydrosolubility, and hence, in the amount of the herbicide in the soil solution. With this strategy, a higher amount of diuron molecules will be more bioaccesible for the soil microorganisms. After HPBCD application mineralisation rate was increased 27 times regarding to the inorganic amendment application, and the extent of herbicide mineralisation reached a 31%. Organic amendments from different origins were also applied on the contaminated soil at different concentrations (0.5, 2 and 4% w/soil dw). In general, as increasing amendment concentration diuron mineralisation rate was improved, regarding to the inorganic amendment application. 33% of the herbicide was mineralised after RSU amendment was applied at 4% w/soil dw. Finally, the joint application of the three amendments investigated and at the best conditions tested was conducted in order to obtain the best diuron mineralisation results. In this case, the inorganic amendment plus RSU amendment at 4% w/soil dw plus HPBCD solution provoked an extent of diuron mineralisation of 54,30 %
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