Transport of PCDDs, PCP and PAHs through soils in the presence of codisposed materials

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5547906

Yousefi, Z

Solubility and sorption experiments were conducted to investigate transport through surface soils of five polychlorodibenzo-p-dioxins (PCDDs), pentachlorophenol (PCP) and three polycyclic aromatic hydrocarbons (PAHs) in the presence of codisposed materials. Batch experiments were conducted to determine the solubilities of the PCDDs in methanol and the solubility of penta-CDD (P{sub 5} CDD) in water/methanol. The slopes of the log-linear relationship between water and methanol solubilities, ({sigma}{sub s}) values obtained versus log K{sub ow} (octanol water partition coefficient) were consistent with the trend observed in the literature. Sorption of PCP (pK{sub a} = 4.7) by surface soils from water/methanol mixtures was measured using column and batch techniques. Water-phase linear sorption partition coefficients (K{sub D}) determined were in agreement with reported literature values. The cosolvent theory was found to be applicable to PCP and a {alpha}{sigma}{sub s} value of 2.9 for PCP was consistent with the trend between {alpha}{sub s} and log K{sub ow} observed in the literature. Batch experiments were conducted to determine sorption of PCDDs by soils at fraction solvent (f{sub s}) of 0.90 to complement the available cosolvent data for PCDDs. The results obtained from these experiments were in agreement with the expected trend and new values of {alpha} and {alpha}{sigma}{sub s} determined over a wider f{sub s} range were in agreement with the trend expected versus log K{sub ow} of these PCDDS. Column techniques were utilized to study transport of PCDDs at f{sub s} values of 0.75, 0.90 and 1.00. The results from these experiments indicated the importance of sorption non-equilibrium for PCDDS. Effect of PCP and CB on sorption of PCDDs to soils in the presence of methanol was investigated.

• Research Organization: Maryland Univ., College Park, MD (United States)
• OSTI ID: 5547906
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540220* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
AROMATICS
CHLORINATED AROMATIC HYDROCARBONS
CONTAMINATION
DIOXIN
ENVIRONMENTAL TRANSPORT
HALOGENATED AROMATIC HYDROCARBONS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
LAND POLLUTION
MASS TRANSFER
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
POLLUTION
POLYCYCLIC AROMATIC HYDROCARBONS
SOILS
SOLUBILITY
SORPTION