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TECHNICAL REPORTS
Organic Compounds in the Environment

Effects of Dissolved Organic Carbon on Sorption and Mobility of Imidacloprid in Soil

Department of Inorganic Chemistry, Univ. of Almería, La Cañada de San Urbano s/n, 04120, Almería, Spain

* Corresponding author (egonzale{at}ual.es)

Received for publication May 31, 2001. To evaluate the effects of dissolved organic carbon on sorption and mobility of the insecticide imidacloprid [1-(6-chloro-3-pyridinyl) methyl-N-nitro-2-imidazolidinimine] in soils, adsorption and column experiments were performed by using a typical calcareous soil from southeastern Spain and two different types of dissolved organic carbon, that is, dissolved organic carbon extracts from a commercial peat (DOC-PE) and high-purity tannic acid (DOC-TA). The experiments were carried out from a 0.01 M CaCl₂ aqueous medium at 25°C. The results obtained from the sorption experiments show that the presence of both DOC-PE and DOC-TA, over a concentration range of 15 to 100 mg L^-1, produces in all cases a decreasing amount of imidacloprid adsorbed in the soil studied. From the column experiments the retardation coefficients (RC) were calculated for imidacloprid by using either 0.01 M CaCl₂ aqueous solution (RC = 2.10), 0.01 M CaCl₂ DOC-PE solution (RC = 1.65), or 0.01 M CaCl₂ DOC-TA solution (RC = 1.87). The results indicate that mobility of imidacloprid is increased 21.4 and 11.0% in the presence of DOC-PE and DOC-TA solutions, respectively. Dissolved organic carbon reduces imidacloprid sorption by competing with the pesticide molecules for sorption sites on the soil surface, allowing enhanced leaching of imidacloprid and potentially increasing ground water contamination.

Abbreviations: DOC-PE, dissolved organic carbon extracts from peat • DOC-TA, dissolved organic carbon extracts from tannic acid • HPLC, high performance liquid cromatography • RC, retardation coefficient

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