  We present near-infrared integral field spectroscopy of ten Herschel selected
galaxies at z~1.5. From detailed mapping of the H$\alpha$ and [NII] emission
lines we trace the dynamics, star formation rates, metallicities and also
investigate gas fractions for these galaxies. For a few galaxies the
distribution of star formation as traced by H$\alpha$ only traces a small
fraction of the stellar disc, which could be tracing recent minor merging
events. The rest-frame ultraviolet (UV) continuum emission often has a
distribution completely different from H$\alpha$, which warns about the use of
UV-SED based star formation tracers in these systems. Our analysis of galaxy
dynamics shows that minor dynamical disruptions (e.g. minor merging) are
generally not enough to cause a deviation from the established 'Main Sequence'
relation. Most galaxies are found to follow the fundamental metallicity
relation (FMR), although with large scatter. One galaxy, (a small satellite
galaxy of a massive companion) is found to deviate strongly from the FMR. This
deviation is in nice agreement with the correlation recently discovered in
local galaxies between gas metallicity and environment, which has been ascribed
to enriched inter-galactic medium (IGM) in dense environments, and therefore
suggests that here the IGM was already significantly enriched by z~1.5.
