Anthracene, a polyaromatic hydrocarbon (PAH) that is a potential carcinogen, has

Question

Anthracene, a polyaromatic hydrocarbon (PAH) that is a potential carcinogen, has been spilled onto the soil at a coal tar distillation plant, and there is concern regarding movement of the contaminant off site. You set up an experiment to measure the Kp value for anthracene. Forty milliliters of solution containing 0.01000 mg/L of anthracene is added to reaction vessels containing 1.00 g of soil or no soil (blanks). After a 24 hr reaction period, the samples are filtered to separate solids and solution. The concentration of anthracene in the samples is found to be 0.00023 mg/L and the concentration in blanks is 0.00930 mg/L. Using this data report the following parameters to your supervisor: Cw (mg/L); Cs (mg/kg); and Kp (L/kg). What do you conclude regarding the sorption of anthracene to soil and potential mobility of this compound in the soil studied?

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Explanation / Answer

Polycyclic aromatic hydrocarbons (PAHs) are organic substances made up of carbon and hydrogen atoms grouped into at least two condensed aromatic ring structures. These are divided into two categories: low molecular weight compounds composed of fewer than four rings and high molecular weight compounds of four or more rings. "PAH derivatives" include PAHs having an alkyl or other radical attached to a ring; "heterocyclic aromatic compounds" (HACs) include PAHs having any one carbon atom in a ring replaced by a nitrogen, oxygen, or sulfur atom.Polycyclic aromatic hydrocarbons (PAHs) are organic substances made up of carbon and hydrogen atoms grouped into at least two condensed aromatic ring structures. These are divided into two categories: low molecular weight compounds composed of fewer than four rings and high molecular weight compounds of four or more rings. "PAH derivatives" include PAHs having an alkyl or other radical attached to a ring; "heterocyclic aromatic compounds" (HACs) include PAHs having any one carbon atom in a ring replaced by a nitrogen, oxygen, or sulfur atom.

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