Cosorption study of organic pollutants and dissolved organic matter in a soil.
In this study we have evaluated the effects of dissolved organic matter (DOM) on sorption of imidacloprid, 3,4-dichloroaniline (3,4-DCA) and 4-bromoaniline (4-BA) on a typical calcareous soil (Luvic Xerosol) from south-eastern Spain. Two different types of DOM were used, that is to say, dissolved natural organic matter extracts from a commercial peat (DNOM) and a high-purity tannic acid (TA) solution. The experiments were carried out in a 0.01 M CaCl2 aqueous medium at 25 degrees C. The results indicated that the presence of both DNOM and TA, over a concentration range of 15-100 mg L(-1), produced an increase in the amount of 3,4-DCA and 4-BA sorbed and a decrease in the amount of imidacloprid retained on the soil studied. A modified distribution coefficient, K(doc), has been proposed as a safer parameter for soil sorption predictions of organic pollutants and it could be of help to model the fate of these in the environment.
Flores-Céspedes
F
F
Department of Inorganic Chemistry, University of Almería, La Cañada de San Urbano s/n, 04120 Almería, Spain.
Fernández-Pérez
M
M
Villafranca-Sánchez
M
M
González-Pradas
E
E
D000327:Adsorption; D000814:Aniline Compounds / Q000032:analysis; D002118:Calcium; D004784:Environmental Monitoring / Q000379:methods*; D052918:Environmental Restoration and Remediation; D019015:Geologic Sediments; D006540:Herbicides / Q000032:analysis; D006812:Humic Substances; D007093:Imidazoles / Q000032:analysis; D000073943:Neonicotinoids; D009574:Nitro Compounds; D009930:Organic Chemicals / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D012995:Solubility; D013634:Tannins
D000814:Aniline Compounds; D006540:Herbicides; D006812:Humic Substances; D007093:Imidazoles; D000073943:Neonicotinoids; D009574:Nitro Compounds; D009930:Organic Chemicals; D012987:Soil; D012989:Soil Pollutants; D013634:Tannins; C023621:4-bromoaniline; C014464:3,4-dichloroaniline; C082359:imidacloprid; D002118:Calcium