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The chemical composition of the gas in galaxies versus cosmic time provides avery important tool for understanding galaxy evolution. Although there are manystudies at high redshift, they are rather scarce at lower redshifts. However,low redshift studies can provide important clues about the evolution ofgalaxies, furnishing the required link between local and high redshiftuniverse. In this work we focus on the metallicity of the gas of star-forminggalaxies at low redshift, looking for signs of chemical evolution.  To analyze the metallicity contents star-forming galaxies of similarluminosities and masses at different redshifts. With this purpose, we present astudy of the metallicity of relatively massive (log(M_star/M_sun)>10.5) starforming galaxies from SDSS--DR5 (Sloan Digital Sky Survey--Data Release 5),using different redshift intervals from 0.04 to 0.4.  We used data processed with the STARLIGHT spectral synthesis code, correctingthe fluxes for dust extinction, estimating metallicities using the R_23 method,and segregating the samples with respect to the value of the[NII]6583/[OII]3727 line ratio in order to break the R_23 degeneracy selectingthe upper branch. We analyze the luminosity and mass-metallicity relations, andthe effect of the Sloan fiber diameter looking for possible biases.  By dividing our redshift samples in intervals of similar magnitude andcomparing them, significant signs of metallicity evolution are found.Metallicity correlates inversely with redshift: from redshift 0 to 0.4 adecrement of ~0.1 dex in 12+log(O/H) is found.

Study of star-forming galaxies in SDSS up to redshift 0.4: I. Metallicity evolution