welding fumes ranged from 0-03 to 0.92%2182124 and
CrO3 content from 0 4-1 8%. The mean value of0 2-
0-3% is negligible from the point of view of
exposure.2
In our study, however, we found that insoluble Cr
VI content in welding fumes varied from 0 1 to 1-2%,
in dust with an average 0 3%.
The data on the insoluble Cr VI content in MMA/
SS welding fumes, especially in industry, have been a
subject of discussion. Taking into account the fact
that Cr VI has been considered to be a human
carcinogen,2 no safe level for Cr VI can be recommended.
It seems that its occurrence in fumes even at
a concentration less than 0-005-0842 mg/m3 may
create a serious health risk (fig 2, table 5).
CONCLUSIONS
Evaluation of occupational exposure has indicated
that MMA/SS welders may exceed the admissible
concentrations of soluble and insoluble Cr VI, Mn,
and Ni.
Due to various changeable parameters in the
working environment, the content of fumes in the
welders' breathing zone is not constant and hence it is
not possible to use one universal exposure indicator