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Penetration of mercury-adsorbed phospholipid monolayers by polynuclear aromatic hydrocarbons
Authors:A Nelson
Institution:Institute for Marine Environmental Research, Prospect Place, The Hoe, Plymouth PL 1 3DH Great Britain
Abstract:The penetration of phospholipid monolayers (dioleoyl lecithin) adsorbed on mercury by polynuclear aromatic hydrocarbons (PAH) is described. The PAH studied were anthracene, phenanthrene, pyrene, benzoa]anthracene, fluoranthene and perylene. The penetration is monitored by measuring the differential capacitance of the monolayer; the uptake of PAH causes a potential shift (up to ?0.25 V) in the cathodic capacitance peaks. This occurs without displacement of the lipid from the mercury. The differential capacitance is measured by out-of-phase (90°) a.c. voltammetry and rapid cyclic voltammetry. The PAH permeate the mercury-adsorbed lipid layers from dilute aqueous solution; the order of affinity is benzoa]anthracene > fluoranthrene = pyrene > anthracene = phenanthrene. The rates of penetration vary for the different compounds and depend on their water solubility.
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