The behaviour of perinaphthenone at the
dropping mercury electrode has been investigated by the combined techniques of
conventional (D.C.) and alternating current (A.C.) polarography. Two D.C. steps
were observed, but an A.C. polarographic wave was found only at the potential
of the more positive D.C. step. Two tensammetric waves were also seen, one of
which appears to be the outcome of multilayer adsorption or of a change in
state of the adsorbed film.
