Penetration of mercury-adsorbed phospholipid monolayers by polynuclear aromatic hydrocarbons |
| |
Authors: | A. Nelson |
| |
Affiliation: | 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, benzo[a]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 benzo[a]anthracene > fluoranthrene = pyrene > anthracene = phenanthrene. The rates of penetration vary for the different compounds and depend on their water solubility. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|