Blood and urine from eleven volunteers not occupationally exposed
to tin have been analyzed using the developed methodology (Table 5).
Levels of tin in blood ranged from7.4 to 11.2 μg L−lwhile urine concentrations
varied from ≤0.8 (LOD) to 2.2 μg L−l. According to the literature
[3], the average concentration of tin in blood of nonexposed
subjects was approximately 140 μg L−1, (a much larger range than
that observed in the present study) while the metal in urine ranged
from 0.5 to 5.0 μg L−1, closer to the present data. However, other studies
cited by ATSDR reported values ranging from2 to 9 μg L−1 for blood
and 1 to 20 μg L−1 for urine [1].Many of these studies are outdated, and
samples were subjected to processes of pre-treatment such as hot acid
digestion requiring a greater number of reagents and steps and they
may suffer from analytical uncertainties