Naslov
Soil Sorption Characteristics of Imidacloprid in Different Croatian Regions

Autori
Broznić, Dalibor ; Marinić, Jelena ; Tota, Marin ; Čanadi Jurešić, Gordana ; Milin, Čedomila

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
NEW ACHIEVEMENTS IN CHROMATOGRAPHY-Book of abstracts / Šegudović, Nikola - Zagreb : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI), 2008, 64-64

ISBN
978-953-6894-36-9

Skup
14. INTERNATIONAL SYMPOSIUM ON SEPARATION SCIENCES, NEW ACHIEVEMENTS IN CHROMATOGRAPHY

Mjesto i datum
Primošten, Hrvatska, 30.09.2008. - 03.10.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
imidakloprid; sorpcija; tlo; Freundlich; Hrvatska
(imidacloprid; sorption; soil; Freundlich; Croatia)

Sažetak
Imidacloprid [1-(6-chloro-3pyridylmethyl)-N-nitroimidazolidin-2-ylideneamine] is a new and potent nitromethylene insecticide with high insecticidal activity at very low application rates. In Croatia, imidacloprid is most commonly used in olive growing areas against olive fruit fly. Understanding variabilities in pesticide sorption than can occur among and within the regions can improve imidacloprid applicability. Therefore, sorption characteristics of imidacloprid in four soils, representative of Krk and Istrian region, were analyzed. Experiments were conducted to examine the relationship between selected soil properties (particle size, organic carbon content, acidity), imidacloprid concentration and soil sorption coefficients (Kf and Kd) for soils among and within the regions. Additionally, applicability of the linear and the Freundlich model to predict imidacloprid sorption was tested. The imidacloprid sorption by soils was quantified using the standard batch equilibrium method in a soil + pesticide solution (1 + 5 by mass). The aqueous phase was analyzed by HPLC using a UV/VIS detector (270 nm ). All analyses were performed on reverse phase C18 column (150 x 4.6 mm, 5 μ m particle size). The mobile phase of acetonitrile + water (1 + 4 by volume) was used under isocratic conditions at a flow rate of 0.8 mLmin-1. Higher sorption was observed in Istrian soils (Kf =2.95 Lkg-1 ; Kd=3.07 Lkg-1) compared to Krk soils (Kf =1.39 Lkg-1 ; Kd=1.46 Lkg-1) probably due to the higher organic carbon and clay content. Kf and Kd correlated significantlly with the organic carbon (R2=0.994, p=0.0031 and R2=0.994, p=0.0028) and clay content (R2=0.987, p=0.0065 and R2=0.995, p=0.0048), but according to the multiple regression the organic carbon content predominantly influenced imidacloprid sorption. Kd statistically differed among and within the regions. In all soils, a greater sorption occurred at lower concentrations of imidacloprid. According to the calculated KOC value (248 Lkg-1), imidacloprid can be categorized as a medium mobility pesticide. The two models adequately described the whole set of data. Lower sorption capacity of soils from the Krk region suggests a greater potential mobility of imidacloprid in the soil profile, indicating a need for regular monitoring and strategy development against groundwater pollution.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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