  In this work we report spectrophotometric observations of a planetary nebula
sample towards the galactic bulge. A total of 45 PNe was observed and their
physical parameters (electron density and temperature) were derived. Ionic
abundances were calculated using a three-level atom model and abundances were
derived through ionisation correction factors. Results show low abundance
objects at high galactic latitudes, indicating a possible vertical gradient
inside the bulge. A few objects with low N/O ratio were found, which could
originated from old, low mass progenitors.
