Many chromium exposure studies in vivo of human and animal toxicokinetic reported that chromium could absorb via the skin but cannot estimate and identify the percentage of chromium absorption (NIOSH, 2010). Chromium has two main oxidation states are trivalent chromium cation (Cr3+) and chromate anion (Cr6-) (ATSDR, 2000). The study of chromium dermal absorption is reported in vitro gas diffusion cell that study full-thickness abdomen of human skin (Gammelgaad et al, 1992). The research was studied the exposure of chromium (III) chloride (CrCl3), chromium (III) nitrate [Cr(NO3)3], and potassium dichromate (K2Cr2O7) to the skin barrier. The study test was 190 hours and the results found that only K2Cr2O7 can pass through the skin. In the skin layers, the chromium concentrations of K2Cr2O7 more than CrCl3 and Cr(NO3)3were 10 times and 15-30 times, respectively. As a result, the Cr (VI) can diffuse pass through the skin more than Cr (III) (Elemental speciation in human health risk assessment: Environmental health criteria 234).