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Sediment toxicity tests with the midge, Chironomus riparius, were carried out in a natural river sediment spiked with either di-2-ethylhexyl phthalate (DEHP) or di-isodecyl phthalate (DIDP). The phthalates were each dosed at three levels in the sediment up to 10000 mg phthalate/kg (dry weight basis) and the test organisms were introduced as larvae (< 24 hours post-hatch). No effects, in any of...