Effect of volatile hydrocarbon fractions on mobility and earthworm uptake of polycyclic aromatic hydrocarbons from soils and soil/lampblack mixtures.
Studies were conducted to examine the mobility and bioavailability to earthworms (Eisenia fetida) of priority pollutant polycyclic aromatic hydrocarbons (PAH) in a suite of 11 soils and soil/lampblack mixtures obtained from former manufactured-gas plant sites. Contaminant mobility was assessed using XAD4 resins encapsulated in dialysis tubing, which were exposed to slurried soils for 15 d. These experiments showed that mobility of PAH in the different soils strongly correlated to the levels of volatile hydrocarbons (namely, gasoline- and diesel-range organics [GRO and DRO]) that existed in the soils as co-contaminants. Actual PAH bioavailability (as measured by earthworm PAH concentrations) also appeared to depend on GRO + DRO levels, although this was most evident at high levels of these contaminants. These findings are discussed in view of the effects of dieselrange organics on oil viscosity, assuming that the hydrocarbon contaminants in these soils exist in the form of distinct adsorbed oil phases. This study, therefore, extends correlations between carrier-oil viscosity and dissolved solute bioavailability, previously observed in a number of other in vitro and whole-organism tests (and in bacterial mutagenicity studies in soil), to multicellular organisms inhabiting contaminated-soil systems.
Bogan
Bill W
BW
Gas Technology Institute, Des Plaines, Illinois 60018, USA. bill.bogan@gastechnology.org
Beardsley
Kate E
KE
Sullivan
Wendy R
WR
Hayes
Thomas D
TD
Soni
Bhupendra K
BK
D000818:Animals; D001682:Biological Availability; D002244:Carbon / Q000032:analysis* / Q000378:metabolism / Q000633:toxicity; D007475:Ion Exchange Resins; D009835:Oligochaeta / Q000187:drug effects / Q000378:metabolism*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis* / Q000378:metabolism / Q000633:toxicity; D011137:Polystyrenes; D011145:Polyvinyls; D012989:Soil Pollutants / Q000032:analysis* / Q000378:metabolism / Q000633:toxicity
D007475:Ion Exchange Resins; D011084:Polycyclic Aromatic Hydrocarbons; D011137:Polystyrenes; D011145:Polyvinyls; D012989:Soil Pollutants; C012101:XAD-4 resin; D002244:Carbon