Size Distribution of Organic Matter and Associated Propiconazole in Agricultural Runoff Material

ABSTRACT Sorption and desorption characteristics of propiconazole (1‐[[2‐(2,4‐dichlorophenyl)‐4‐propyl‐1, 3‐dioxolan‐2‐yl] methyl]‐1H‐1,2,4‐triazole) to different particle/aggregate‐size fractions of agricultural runoff material were investigated. Emphasis was put on clay and colloidal size fraction...

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Bibliographic Details
Published in:Journal of environmental quality 2003-11, Vol.32 (6), p.2200-2206
Main Authors: Wu, Qinglan, Riise, Gunnhild, Kretzschmar, Ruben
Format: Article
Language:English
Subjects:
Adsorption
Agricultural runoff
Agriculture
Agronomy. Soil science and plant productions
Applied sciences
Biological and medical sciences
Biomass
Carbon - analysis
Centrifugation
Clay
Desorption
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Humans
Natural water pollution
Nitrogen - analysis
Organic matter
Particle Size
Pesticides
Pollution
Pollution, environment geology
Rainwaters, run off water and others
Sediment load
Soil and water pollution
Soil Pollutants - analysis
Soil science
Solubility
Sorbents
Sorption
Triazoles - analysis
Triazoles - chemistry
Ultrafiltration
Water Movements
Water Pollutants, Chemical - analysis
Water treatment and pollution
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Summary:ABSTRACT Sorption and desorption characteristics of propiconazole (1‐[[2‐(2,4‐dichlorophenyl)‐4‐propyl‐1, 3‐dioxolan‐2‐yl] methyl]‐1H‐1,2,4‐triazole) to different particle/aggregate‐size fractions of agricultural runoff material were investigated. Emphasis was put on clay and colloidal size fractions to evaluate their role as potential sorbents and carriers for this pesticide. The runoff material was separated into size fractions ranging from 2 mm to ca. 15 nm by wet sieving, sedimentation, centrifugation, and membrane ultrafiltration. Each fraction was characterized by its organic C content and C/N ratio. Distinctive sorption properties of clay‐sized particles and colloids were investigated. The obtained size fractions differed significantly in their organic C concentration, C/N ratio, and sorption properties to propiconazole. Organic matter was mainly associated in aggregates >2 μm. Binding of propiconazole to this coarse fraction made up 80% of the sorbed propiconazole. The distribution coefficient between solid and aqueous phases increased with decreasing particle size. The colloidal fraction (
ISSN:0047-2425
1537-2537
DOI:10.2134/jeq2003.2200