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Pentachlorophenol association with fulvic acids from recycled wastes
Joaquim C G Esteves da Silva1, Miguel C P O Marques
1Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências, Universidade do Porto, R. Campo Alegre 687, 4169-007 Porto, Portugal. jcsilva@fc.up.pt <jcsilva@fc.up.pt>
Environmental Pollution (Barking, Essex : 1987)
|October 31, 2006
Summary
Pentachlorophenol solubility increases significantly in the presence of fulvic acids (FA) from various sources. These findings highlight FA
Area of Science:
- Environmental Chemistry
- Soil Science
- Organic Geochemistry
Background:
- Pentachlorophenol (PCP) is a persistent organic pollutant.
- Understanding PCP's environmental fate requires knowledge of its solubility and interactions.
- Fulvic acids (FA) are key soil organic matter components influencing contaminant behavior.
Purpose of the Study:
- To measure pentachlorophenol apparent water solubility in various aqueous matrices.
- To quantify the interaction between pentachlorophenol and different fulvic acid samples.
- To determine the impact of fulvic acids on pentachlorophenol's aqueous solubility and partitioning.
Main Methods:
- Apparent water solubility measurements of pentachlorophenol at pH 6 and 25°C.
- Solubility enhancement method for determining partition coefficients (Koc).
- Analysis of variance (ANOVA) to assess the effect of FA type on solubilization.
Main Results:
- Pentachlorophenol exhibited strong association with all tested fulvic acid samples.
- Calculated Koc values for pentachlorophenol ranged from (211±22)x10² to (253±26)x10² L/kg organic carbon.
- Fulvic acid type significantly influenced the aqueous solubilization of pentachlorophenol and pyrene.
Conclusions:
- Fulvic acids significantly enhance the aqueous solubility of pentachlorophenol.
- The source of fulvic acid impacts its effectiveness in solubilizing organic contaminants.
- These findings are crucial for predicting the environmental transport and fate of pentachlorophenol.
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