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Nude mice each attached to a respirator to avoid pulmonary uptake were exposed in a glass exposure chamber to 200, 1000 or 3000 ppm of benzene, toluene or tetrachloroethylene (perclene) for 2, 4 or 6 h. The animals were killed at the end of the study and the amount of each solvent retained in the whole body was determined by gas chromatography. Skin absorption rates were calculated from the amount retained in the whole body using the single compartment model (elimination rate constant) obtained in a previous experiment. There was a linear relationship between the amount of skin absorption and exposure time, and also a linear relationship between the skin adsorption rate and concentration of exposed vapors. Skin absorption of solvent vapors occurs by passive diffusion as defined by Fick's law. The skin absorption coefficient (cm/h) of each solvent vapor was calculated by dividing the skin absorption rate by exposure concentration; the values were 1.24 for toluene, 1.00 for perclene and 0.619 for benzene. The coefficient may be useful for evaluating the amount of skin absorption (ng) was calculated by multiplying the skin absorption coefficient (cm/h), concentration of solvent vapor (ng/cm3), exposure time (h) and exposed skin area (cm2).

Skin absorptionof organic solvent vapors in nude mice in vivo.