Persistence, movement and decontamination studies of TCDD in storage sites massively contaminated with phenoxy herbicides

Photodegradation of Polychlorinated Dibenzo-p-dioxins in Liquid Samples by Near UV Light Irradiation

“…The 75 PCDD homologs show different toxicities depending on the degree of chlorination and on the position of the chlorine atoms in the dibenzo ring, the most toxic ones being the tetrachlorosubstituted (2,3). They are chemically stable and able to bioaccumulate in organisms and are thus extremely significant for the environment (4)(5)(6). The fate and diffusion of PCDDs in the environment may involve volatilization, atmospheric transport, oxidation, reduction, bioaccumulation, bio-and photodegradation, etc.…”

Theoretical analysis of a method for in situ decontamination of soil containing 2,3,7,8-tetrachlorodibenzo-p-dioxin

“…However, transport in a bulk organic phase is much faster and therefore will dominate if such a phase is contained in the soil. Other data support this finding (4,19). Puri et al (20) did preliminary studies to monitor the distribution coefficient of TCDD in waste oil.…”

“…Nonetheless, public anxiety mandates that effective cleanup methods be found. TCDD has extremely low water solubility and volatility and thus can be very persistent once introduced into the soil environment (3,4). Other chemicals such as PCBs and chlorinated furans exhibit similar behavior.…”

Diffusion of 2,3,7,8-tetrachlorodibenzo-p-dioxin in soil containing organic solvents

“…Removal of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) from contaminated soil is of recent interest in many areas of the country and the world. The chemical has extremely low water solubility and volatility and thus can be very persistent once introduced into the soil environment (1,2). Other chemicals such as PCBs and chlorinated furans exhibit similar behavior.…”

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The transport of 2,3,7, in soils containing various organic liquids has been measured experimentally. A model has been developed that considers diffusive transport in the liquid phase and takes into account the rate of adsorption and desorption of TCDD from the soil particles.

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