Abstract
We have obtained long-slit observations in the optical and near infrared of 12 circumnuclear HII regions (CNSFR) in the early type spiral galaxies NGC 2903, NGC 3351 and NGC 3504 with the aim of deriving their chemical abundances. Only for one of the regions, the [SIII] 6312 A was detected providing, together with the nebular [SIII] lines at 9069, 9532 A, a value of the electron temperature of Te([SIII])= 8400 +4650 1250K. A semi-empirical method for the derivation of abundances in
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