Naslov
Sorption of chlorophenolates in soils and aquifer and marine sediments

Autori
Fingler, Sanja ; Drevenkar, Vlasta ; Fröbe, Zlatko

Izvornik
Archives of environmental contamination and toxicology (0090-4341) 48 (2005), 1; 32-40

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Sorption; 2; 4; 6-trichlorophenol; 2; 3; 4; 6-tetrachlorophenol; pentachlorophenol; soil; marine sediments; Freundlich isotherm

Sažetak
This article describes the sorption behavior of 3 hydrophobic ionisable chlorophenols - 2, 4, 6-trichlorophenol, 2, 3, 4, 6-tetrachlorophenol and pentachlorophenol - in different types of natural sorbents. A series of experiments was carried out with 11 topsoil samples, 9 aquifer sediments and 12 marine sediments differing in pH, organic-matter content and mineral composition, and presumably also in type of organic matter due to their different origins. Ionized forms of chlorophenols dominated in almost all sorption experiments. Freundlich isotherm coefficients Kf and 1/n, as well as organic-matter sorption coefficient (log Kom) and free-energy change (Δ Go), were calculated for all 3 compounds in all sorbents. The sorption intensity of predominantly ionized chlorophenols increased linearly with the increase of sorbent organic-matter content, and decreased with the increasing sorbent pH. Different sorption behavior of all 3 compounds in marine sediments in respect to topsoils and aquifer sediments was indicated by significant differences in Kf and 1/n coefficients as well as in log Kom and Δ Go values. The highest Kf and log Kom values were obtained for sorption of chlorophenolic compounds in topsoils and the lowest in marine sediments, although both groups of sorbents had similar organic-matter content. The 1/n coefficient, reflecting the isotherm nonlinearity, was considerably lower than unity for all compounds in almost all sorbents. The most significant deviation of sorption isotherms from linearity was observed in marine sediments. Only marine sediments showed a linear increase in sorption intensity of all 3 compounds with the increase in sorbent-specific surface area. The results pointed at a different mechanism of sorption in marine and terrestrial sorbents, and confirmed that the capacity of sorption was related to amount as well as the type and origin of organic matter.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA