Sorptive behavior of sorgoleone in Ultisol in two solvent systems and determination of its lipophilicity

Sorgoleone (SGL) exuded by sorghum roots inhibits the development of some weeds. Due to its high hydrophobicity, it is expected that SGL presents low soil mobility and limited allelopathic activity in the field. This work aims to evaluate the sorptivity of sorgoleone in octanol-water and in soil und...

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Bibliographic Details
Published in:Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes Pesticides, food contaminants, and agricultural wastes, 2006-01, Vol.41 (4), p.345-356
Main Authors: Trezzi, M.M, Vidal, R.A, Dick, D.P, Peralba, M.C.R, Kruse, N.D
Format: Article
Language:English
Subjects:
Adsorption
Agronomy. Soil science and plant productions
allelochemicals
Allelopathy
Analysis of Variance
Benzoquinones - chemistry
Biochemistry
Biochemistry and biology
Biological and medical sciences
Chemical agents
Chemical, physicochemical, biochemical and biological properties
Chromatography, High Pressure Liquid - methods
Dose-Response Relationship, Drug
Fundamental and applied biological sciences. Psychology
grain sorghum
Hydrophobic and Hydrophilic Interactions
Isotherms
Linear Models
Lipids - chemistry
methanol
Methanol - chemistry
Models, Chemical
octanol
Physics, chemistry, biochemistry and biology of agricultural and forest soils
Plant physiology and development
Quinones
root exudates
Soil - analysis
Soil science
Solubility
solvents
Solvents - chemistry
Sorghum
Sorption
sorption isotherms
Ultisols
Vegetative apparatus, growth and morphogenesis. Senescence
Water - chemistry
weed control
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Summary:Sorgoleone (SGL) exuded by sorghum roots inhibits the development of some weeds. Due to its high hydrophobicity, it is expected that SGL presents low soil mobility and limited allelopathic activity in the field. This work aims to evaluate the sorptivity of sorgoleone in octanol-water and in soil under two solvent systems. The two solvent systems were methanol:water (60:40) (MeOH:H 2 O) and pure methanol (MeOH). These two solvent systems promote different conditions for SGL solubility. Treatments were arranged in a 2 × 6 factorial (solvent systems × equilibrium concentrations in the solution (EC)). For each solvent, the sorption was achieved by shaking 500 mg of soil with 10 ml of 0, 5, 10, 15, 25, 40, and 60 mg L −1 of SGL solution, during 24 h. After centrifugation, the supernatant was filtered and the SGL concentration was determined by high performance liquid chromatography (HPLC). Data of sorbed amount of SGL were submitted to variance analysis, using a hierarchic factorial model. The data of sorbed amount (x/m) and equilibrium concentration (C) were fitted to the linear (x/m = a + K d C) and to the Freundlich (x/m = K f C 1/n ) models. The isotherm obtained for the MeOH:H 2 O system presented linear shape, whereas for the MeOH system a two subsequent linear isotherm was fitted. Sorgoleone is a highly hydrophobic compound, presenting a log K ow of 6.1. The sorption of sorgoleone to the soil was very high. The organic environment stimulated the sorgoleone sorption to the soil.
ISSN:0360-1234
1532-4109
DOI:10.1080/03601230600613780