Sorption of chlorinated phenols by natural sediments and aquifer materials
Laboratory experiments have been conducted to study the sorption of chlorinated phenols by sediments and aquifer materials. It is shown that sorption not only of the nondissociated phenols but also of their conjugate bases (phenolates) can occur. At typical ambient concentrations, sorption equilibrium can be described by the equation S = DC, where S = concentration in the solid phase, D = overall distribution ratio, and C = concentration in the liquid phase. In natural waters of low ionic strength (i.e., I less than or equal to approx. 10/sup -3/ M) and of pH not exceeding the pK/sub a/ of the phenol by more than one log units, phenolate sorption can be neglected and the overall distribution coefficient may be expressed by D = K/sub p/Q, where K/sub p/ = partition coefficient of the nonionized phenol and Q = degree of protonation. K/sub p/ may be estimated from the octanol/water partition coefficient of the compound and from the organic carbon content of the sorbent. In the case of tetra- and pentachlorophenol, phenolate sorption usually has to be considered. It is strongly influenced by the organic carbon content of the sorbent and by the ionic strength of the aqueous medium.
- Research Organization:
- Swiss Federal Inst. for Water Resources and Water Pollution Control, Duebendorf
- OSTI ID:
- 6308239
- Journal Information:
- Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 18:9; ISSN ESTHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AQUIFERS
AROMATICS
BENCH-SCALE EXPERIMENTS
DATA
ENVIRONMENTAL TRANSPORT
EQUATIONS
EQUILIBRIUM
EXPERIMENTAL DATA
HYDROXY COMPOUNDS
INFORMATION
MASS TRANSFER
MATHEMATICAL MODELS
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PARTITION
PHENOLATES
PHENOLS
SEDIMENTS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES