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Iron suffers from high levels of depletion in the highly ionized environmentsof planetary nebulae, making the direct determination of undepleted elementaliron abundances difficult. Zinc, which does not suffer from the same depletioneffects as iron, may be used as a surrogate element to measure iron abundancesas there is an approximately constant zinc-to-iron ratio across a wide range ofmetallicities. In this paper, we report zinc abundances of six Galactic Bulgeplanetary nebulae determined from new observations taken with ISAAC on the VeryLarge Telescope, Chile, prior to the instrument's decommissioning as well as afurther three based upon literature observations. UVES data of the sampleplanetary nebulae are presented and have been used to derive abundances,temperatures and densities of a variety of elements and ions. The abundancesderived from the UVES data agree well with results from the literature. [Zn/H],determined from the ISAAC observations, is found to be generally sub-solar and[O/Zn] is found to be either consistent or enriched with respect to Solar.

Abundances in Galactic Bulge planetary nebulae from optical, ultraviolet and infrared observations