Fig. 9From: The global variability of diatomaceous earth toxicity: a physicochemical and in vitro investigationRelationship between crystalline silica content and reactivity in vitro. Correlation of crystalline silica content of DE (measured by the addition of cristobalite and quartz peak heights, accounting for different diffraction power using standards) with (a) haemolysis post-exposure to 1 mg/ml bulk DE, and (b) cell viability post-exposure to 500 μg/ml bulk DEBack to article page