  We present the results of a 73 ks long Chandra observation of the dipping
source X 1624-490. During the observation a complex dip lasting 4 hours is
observed. We analyse the persistent emission detecting, for the first time in
the 1st-order spectra of X 1624-490, an absorption line associated to
\ion{Ca}{xx}. We confirm the presence of the \ion{Fe}{xxv} K$_\alpha$ and
\ion{Fe}{xxvi} K$_\alpha$ absorption lines with a larger accuracy with respect
to a previous XMM observation. Assuming that the line widths are due to a bulk
motion or a turbulence associated to the coronal activity, we estimate that the
lines have been produced in a photoionized absorber between the coronal radius
and the outer edge of the accretion disk.
