Biological Impact of Exposure to Extremely Fine-Grained Volcanic Ash

Figure 6

Cell viability, as assessed by MTT assay, of Pichincha volcanic ash in (a) A549 and (b) McCoy cells with ash treatments after 72, 120, 168, and 240 hours. The monolayer cell cultures were exposed to 80 µg/cm³ (black), 320 µg/cm³ (yellow), and 1280 µg/cm³ (purple) of volcanic ash and 400 µg/cm³ titanium dioxide (blue). The negative control (red) was cell without any treatment. ; (two-way ANOVA with Dunnett’s posttest).

(a)

(b)