In many ways ddt was a miracle chemical when its efficacy against biting insects was discovered at the start of the second world war .
当第二次世界大战伊始发现它抗蚊虫叮咬的功效之后,滴滴涕在许多方面都成为一种特效化学药剂。
Fish , in particular , contain carcinogens ( pcbs , ddt ) and heavy metals ( mercury , arsenic ; lead , cadmium ) that cannot be removed through cooking or freezing .
" Even though we haven 't used ddt in decades , its metabolites are still detected in almost everyone in the country , " said lead researcher mary turyk , an epidemiologist at the university of illinois-chicago 's school of public health .
But in 1962 , rachel carson published silent spring , which argued that ddt , whatever its primary benefits , was also having unintended environmental consequences .
What was not known at the time , however , was ddt 's propensity to accumulate , persist and damage the environment .
然而在那时没有人知道,滴滴涕有富集性,稳定性并且破坏环境。
Assessing ecological risks of ddt and lindane to freshwater organisms by species sensitivity distributions .
应用物种敏感性分布评估ddt和林丹对淡水生物的生态风险。
However , as early as the 1940s scientists had begun expressing concern over hazards associated with the use of ddt , and extensive research has since implicated the organochlorine insecticide in the poisoning of humans , animals and the environment .