All solutions and standards used were prepared with highpurity
water obtained from a Milli-Q system
and had a specific resistivity of 18 MX-cm.
All reagents used
were of the highest analytical grade
The standards were prepared
by the successive dilution of a 1000 mg L1 stock solution of cadmium
in 0.5% nitric acid. A volume
of three microlitres of a 1000 mg L1 ICP-MS aluminium solution
was used as chemical modifier
being that the samples
and standards volumes injected in the graphite furnace for the
direct method was 20.0 lL.