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We present FUSE spectra of the giant HII region NGC604 in the spiral galaxyM33. Chemical abundances are derived from far-UV absorption lines and arecompared to those derived from optical emission lines. We derived the columndensities of HI, NI, OI, SiII, PII, ArI, and FeII, fitting the line profileswith either a single component or several components. Our net results, assuminga single component, show that N, O, Si, and Ar are apparently underabundant inthe neutral phase by a factor of 10 or more with respect to the ionized phase,while Fe is the same. However, we discuss the possibility that the absorptionlines are made of individual unresolved components, and find that only PII,ArI, and FeII lines should not be affected by the presence of hidden saturatedcomponents, while NI, OI, and SiII might be much more affected. If N, O, and Siare actually underabundant in the neutral gas of NGC604 with respect to theionized gas, this would confirm earlier results obtained for the blue compactdwarfs. However, a deeper analysis focused on P, Ar, and Fe mitigates the aboveconclusion and indicates that the neutral gas and ionized gas could havesimilar abundances.Comment: Accepted for publication in A&

Interstellar abundances in the neutral and ionized gas of NGC 604