Figure 3.

 Hemolytic activity of each type of asbestos and increases in catalytic iron resulting from adsorption of hemoglobin on the asbestos surface. (a,b) Silica and chrysotile exhibited prominent hemolysis, whereas crocidolite and amosite showed lower hemolytic activity. Hemolysis was time‐dependent and eventually reached a plateau. Incubations were performed at 4 or 37°C as indicated. (c) Increased catalytic activity of chrysotile and crocidolite after hemoglobin adsorption. Silica did not show catalytic activity even after incubation with hemoglobin. The amount of catalytic iron was calculated based on a standard curve using Fe(NO₃)₃. **P < 0.01 relative to the negative control (deionized water instead of asbestos or iron). †P < 0.05 between the indicated groups. NS, no significant detection.