We have constructed a spatially resolving spectrophotometer for measuring the concentration gradients of low molar extinction coefficient metal ions near surfaces. The instrument has a spatial resolution of 1mm and a concentration resolution of 5 x 10-4M. Our intentions with this work are to view concentration gradients in the low gravity produced on a KC-135 aircraft and compare them with those produced on earth and to use a modified version of the spectrophotometer to determine gradients for multiple ions depositing as an alloy such as Ni/Cu or Co/Ni.