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The disposition of di-(2-ethylhexyl) phthalate (DEHP) and mono-(2-ethylhexyl) phthalate (MEHP) was studied in the rat. Three hours after a single oral dose of DEHP (2.8 g/kg), plasma concentrations of 8.8 +/- 1.7 micrograms/ml DEHP and 63.2 +/- 8.7 micrograms/ml MEHP were reached. MEHP levels declined with a half-life of 5.2 +/- 0.5 h. The ratio of the area under the plasma concentration-time curve of MEHP to that of DEHP was 16.1 +/- 6.1. When 14C-DEHP was administered, 19.3 +/- 3.3% of the radioactivity was excreted in the urine within 72 h, the rest being excreted in the faeces. The urinary excretion rate of total radioactivity declined with a half-life of 7.9 +/- 0.5 h. Single administration of MEHP (0.4 g/kg) resulted in plasma concentrations of 84.1 +/- 14.9 micrograms/ml 3 h after dosing; the half-life of MEHP was 5.5 +/- 1.1 h. Multiple dosing with DEHP (2.8 g/kg/day) for 7 consecutive days produced no accumulation of DEHP or MEHP in plasma.
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