  We present heavy element abundance measurements for 16 DAO white dwarfs,
determined from Far-Ultraviolet Spectroscopic Explorer {FUSE} spectra. Evidence
of absorption by heavy elements was found in the spectra of all the objects.
Measurements were made using models that adopted the temperatures, gravities
and helium abundances determined from both optical and FUSE data by Good et al.
(2004). Despite the different evolutionary paths that the types of DAO white
dwarfs are thought to evolve through, their abundances were not found to vary
significantly, apart from for the silicon abundances. Abundances measured when
the FUSE derived values of temperature, gravity and helium abundance were
adopted were, in general, a factor 1-10 higher than those determined when the
optical measure of those parameters was used. Satisfactory fits to the
absorption lines were achieved in approximately equal number. The models that
used the FUSE determined parameters seemed better at reproducing the strength
of the nitrogen and iron lines, while for oxygen, the optical parameters were
better.
