  Low- and intermediate-mass ($\rm 0.8~M_\odot < M < 8~M_\odot$) stars that
evolve into planetary nebulae (PNe) play an important role in tracing and
driving Galactic chemical evolution. Spectroscopy of PNe enables access to both
the initial composition of their progenitor stars and products of their
internal nucleosynthesis, but determining accurate ionic and elemental
abundances of PNe requires high-quality optical spectra. We obtained new
optical spectra of eight highly-extincted PNe with limited optical data in the
literature using the Low Resolution Spectrograph 2 (LRS2) on the Hobby-Eberly
Telescope (HET). Extinction coefficients, electron temperatures and densities,
and ionic and elemental abundances of up to 11 elements (He, N, O, Ne, S, Cl,
Ar, K, Fe, Kr, and Xe) are determined for each object in our sample. Where
available, astrometric data from Gaia eDR3 is used to kinematically
characterize the probability that each object belongs to the Milky Way's thin
disk, thick disk, or halo. Four of the PNe show kinematic and chemical signs of
thin disk membership, while two may be members of the thick disk. The remaining
two targets lack Gaia data, but their solar O, Ar, and Cl abundances suggest
thin disk membership. Additionally, we report the detection of broad emission
features from the central star of M 3-35. Our results significantly improve the
available information on the nebular parameters and chemical compositions of
these objects, which can inform future analyses.
