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PubMed1984

[Toxicokinetics of benzene in humans. Excretion of phenol with urine and benzene with expired air after single and 4-day inhalation exposure].

Five male volunteers were exposed to benzene vapour (100 mg X m-3) during 2 h singly and during 4 successive days. The mean retention of benzene in the lungs and mean dose amounted to 61% and 74 mg, respectively. Two phases of the excretion of unchanged benzene in the expired air (t 1/2 approximately 2 h and approximately 20 h) and phenol in the urine (t 1/2 approximately 3 h and approximately 12 h) were observed. The observed half time values were similar after single and repeated exposure. Respective values for 4-days experiment amounted to 28 and 47% of the dose absorbed during the last day of exposure. Concentrations of benzene in the expired air and the rate of excretion of phenol in urine were higher after 4-days exposure than after single exposure, which results from benzene toxicokinetics. Coefficients of kinetic processes rate amounted to k2 = 0,15; k3 = 0,07; k4 = 0,06 and sigma kEM = 0,16 X h-1.

Adult↗
PubMed1984

Blood n-hexane concentration following acute inhalation exposure in rats.

Blood n-hexane concentrations in rats is reported. Groups of four rats were exposed to a n-hexane vapor/air mixture, in a glass chamber. At the end of the exposure, the animals were sacrificed by decapitation, blood was collected, and the concentration of n-hexane in blood was determined by headspace gas chromatography. Results indicate that blood becomes saturated with n-hexane in 10 minutes or less and persisted in the other exposure periods, up to and including 30 minutes.

Air Pollutants, Occupational↗