  A laboratory study on the band profiles and band strengths of H2O in CO ice,
and vice versa, is presented and interpreted in terms of two models. The
results show that a mutual interaction takes place between the two species in
the solid, which alters the band positions and band strengths. It is found that
the band strengths of the H2O bulk stretch, bending and libration vibrational
bands decrease linearly by a factor of up to 2 when the CO concentration is
increased from 0 to 80%. By contrast, the band strength of the free OH stretch
increases linearly. The results are compared to a recently performed
quantitative study on H2O:CO2 ice mixtures. It is shown that for mixing ratios
of 1:0.5 H2O:X and higher, the H2O bending mode offers a good tracer to
distinguish between CO2 or CO in H2O ice. Additionally, it is found that the
band strength of the CO fundamental remains constant when the water
concentration is increased in the ice. The integrated absorbance of the 2152
cm-1 CO feature, with respect to the total integrated CO absorption feature, is
found to be a good indicator of the degree of mixing of CO in the H2O:CO
laboratory ice system. From the change in the H2O absorption band strength in
laboratory ices upon mixing we conclude that astronomical water ice column
densities on various lines of sight can be underestimated by up to 25% if
significant amounts of CO and CO2 are mixed in.
