For
the UV-vis absorption a 500 nm wavelength was used because
it gave better results compared to the higher wavelengths used
in previous publications. The detection limit can perhaps, by
using a better pump pulse damper, be further lowered. These
detection limits are in agreement with previous studies (13, 15-
17). The results are better than what normally is obtained with
AAS but not as low as the parts per thousand range that is
possible by ICP-MS