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Five polycyclic aromatic hydrocarbons (benzo[a]pyrene, pyrene, anthracene, fluoranthene, and phenanthrene) have been adsorbed, from the vapor phase, onto coal fly ash, and the susceptibility of each of the adsorbed compounds to photodecomposition has been studied. Benzo[a]pyrene, pyrene, and anthracene all photolyze efficiently in liquid solution but are highly resistant to photodegradation when adsorbed on fly ash. However, benzo[a]pyrene and anthracene photo-1094 Environmental Science & Technology

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The MPI Building Block concept provides unusual versatility and performance with solid state reliability, This modular electrochemistry system accepts inputs from virtually any detector you provide and has over 60 applications to serve your needs.

The electrodeposition of aluminum at glassy carbon, platinum, and tungsten electrodes in slightly acidic chloroaluminate melts has been studied using cyclic voltammetry, chronopotentiometry, chronoamperometry, and related techniques. The reduction of Al2Cl7− ions involves a nucleation process at glassy carbon electrodes and to a lesser extent, at the platinum and tungsten electrodes. At platinum electrodes alloy formation is also involved. The discrepancies in the values of diffusion coefficients obtained by three different methods may be attributed to the nucleation effect.

Polycyclic aromatic hydrocarbons adsorbed onto coal fly ash were found to be stabilized against photochemical decomposition. However, a number of adsorbed polycyclic aromatic hydrocarbons will spontaneously oxidize in the absence of light, with those compounds containing a benzylic carbon being particularly susceptible. The decomposition rate appears to be fly ash-dependent.

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