Hexachlorocyclopentadiene

CAS RN:77-47-4

Soil Adsorption / Mobility

The attenuation mechanisms & capacity of selected clay minerals and soils for hexachlorocyclopentadiene (C-56) adsorption, a chemical model to predict C-56 migration through soil materials, & the major degradation products of C-56 in the environment were investigated. C-56 was readily adsorbed by soil materials; the adsorption capacity of C-56 was highly correlated with the total organic carbon content. Adsorbed C-56 remained immobile in the earth materials when leached with water, landfill leachates, and caustic soda brine solutions, but was highly mobile when leached with organic solvents.
The average soil adsorption coefficient (Koc) for hexachlorocyclopentadiene, based on measurements made in 15 different soils, was determined to be 4,265(1). Measured Rf values for hexachlorocyclopentadiene in muck, silt, silt loam, silt clay, loam, and sandy soils leached with tap water and landfill leachate range between 0.001-0.005(1). Based on a classification scheme(2), these data indicate that hexachlorocyclopentadiene has very low mobility in soil(SRC).
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