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Deep spectrophotometry has proved to be a fundamental tool to improve ourknowledge on the chemical content of planetary nebulae. With the arrival ofvery efficient spectrographs installed in the largest ground-based telescopes,outstanding spectra have been obtained. These data are essential to constrainstate-of-the-art nucleosynthesis models in asymptotic giant branch stars and,in general, to understand the chemical evolution of our Galaxy. In this paperwe review the last advances on the chemical composition of the ionized gas inplanetary nebulae based on faint emission lines observed through very deepspectrophotometric data.

Chemical abundances in Galactic planetary nebulae from faint emission lines