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XTE J1118+480 is a well established black hole candidate with a mass estimatein the range from 7 to 10 solar masses. With BeppoSAX we observed the source 4times, from April to December 2000. Results of the firs t observation werealready reported (Frontera et al. 2001). Here we report spectral results of thelater observations, performed in May, June and December 2000 and compare themwith the results obtained from the 2000 April observation. We observe adecrease of the column density from a value consistent with the Galactic N_Hobtained from radio measurement s to a value a factor 2 lower. The spectra arewell fit with a thermal Comptonization plus a blackbody model. The blackbodyluminosity decreases with time, while the electron temperature of theComptonizing electron s does not show significant changes. A Compton reflectioncomponent is apparent and stable, although weak (mean value of Omega/2pi =0.21[-0.04,+0.05]). The reflector shows a low metallicity (mean value of Z/Zsun= 0.13[-0.04,+0.06]). On the basis of the spectral results, a hot central diskappears the best scenar io for the high energy photons, while the temporalproperties point to a non therma l origin of a fraction of the soft X-rayphotons, likely synchrotron emission internal to the hot disk.Comment: 26 pages, 8 figures, accepted for publication in The Astrophysical  Journa

Spectral and Temporal Behavior of the Black Hole Candidate XTE J1118+480 as Observed withBeppoSAX