Abstract
Effects of welding fumes in an established human cell line NHIK 3025 have been studied. The welding fume material was collected by air filtration from the welding of stainless steel with a stainless-steel electrode. Addition of the fume particles suspended in 0.9% NaCl to the culture medium reduced cell proliferation and substantially increased the fraction of abnormally large cells. A filtrate of this suspension produced similar effects. Analysis showed that hexavalent chromium constituted 3.5% of the total welding fume material collected. Other metals such as nickel, iron, and manganese were tested at their concentrations in the welding fume particles but displayed only slight toxicity. However, corresponding concentrations of hexavalent chromium alone produced very similar effects of those of the welding fume suspension and filtrate. It is concluded that the toxic effect of the welding fume sample on the bioassay system employed is almost entirely due to hexavalent chromium.
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