Abstract
Recent observations of quasars have provided to observe the host galaxy of these objects where one can see, for some cases, regions with a high rate of star formation (SFR), of the order of 200 M/year up to 3000 M/year for objects with high redshift (z ~ 6). Until the moment, metallicity (Z) determinations in this class of objects, mostly based on photoionization models, have not consid…