TOXICOLOGICAL PROFILE FOR CHROMIUM - Davidborowski.com

CHROMIUM 2925. POTENTIAL FOR HUMAN EXPOSUREwater via wet and dry deposition. In the case of chromium, the mass median diameter of the ambientatmospheric particle is .1 µm (Milford and Davidson 1985; Ondov et al. 1989), and the depositionvelocity is 0.5 cm/second (Schroeder et al. 1987). This size and deposition velocity favor dry depositionby inertial impaction (Schroeder et al. 1987). Wet removal of particulate chromium also occurs byrainout within a cloud, and washout below a cloud, and acid rain may facilitate removal of acid-solublechromium compounds from the atmosphere. The wet scavenging ratio (i.e., the concentration ofcontaminant in precipitation over the concentration in unscavenged air) ranges from 150 to 290 forchromium (Dasch and Wolff 1989; Schroeder et al. 1987). The wet deposition ratio increases withparticle size and decreases with precipitation intensity (Schroeder et al. 1987). Chromium particles ofaerodynamic diameter