The hydrogenation of the amorphous alloy Fe87V3Zr10 is studied using secondary ion mass spectroscopy (SIMS) and Mossbauer spectroscopy (MS). It is shown that the atoms of hydrogen in charged samples combine preferentially with atoms of zirconium and produce clusters of ZrH, and a proportion of hydrogen combine with atoms of vanadium and iron and produce clusters of VH and FeH. the mechanism that hydrogen influences the magnetism of this alloy is discussed.