Interestingly, [gamma]-HCH, dieldrin
, 2,4'-DDE, 4,4'-DDD, 2,4'-DDT, and 4,4'-DDT were not recorded at all (Table 3).
The concentrations of aldrin, dieldrin
, endrin, DDT, hexachlorocyclohexane, and hexachlorobenzene remained below the established target values in all bottom sediments.
It was indeed like a mystery novel, with the primary culprit being DDE, not DDT, or dieldrin
, or any other of the array of biocides that Carson had described in Silent Spring.
But, it added, a limited number of samples showed high concentrations of, among other things, arsenic, hydrocarbons, chlordane, dieldrin
, aldrin and lead.
These chemicals include the banned but persistent PCBs and organochlorine pesticides such as DDT, Dieldrin
and Aldrin, along with the now ubiquitous phthalate-based plastics.
The IRRs also were not elevated for categories of dieldrin
in this analysis, although previous studies of serum concentrations of this OC pesticide have demonstrated increased breast cancer risk (Hoyer, Jorgensen, Brock, & Grandjean, 2000; Wolff et al.
The volunteer position helped him focus his scientific interest in environmental toxicology, and in 1995 spurred him to graduate school at Clemson University, where he dissected and analyzed the brains of deer mice to learn how the insecticide dieldrin
alters their ability to adapt to the cold.
Agricultural sprays using poisons like DDT and dieldrin
were to blame.
Their studies show that dieldrin
, a pesticide used to control termites, and polychlorinated biphenyls (PCBs), toxic compounds used in electrical transformers, prevent proper storage of dopamine and may even contribute to the death of dopamine-containing neurons.
Some house and garden pesticides, such as dieldrin
and chlordane, are now banned in many countries because they can damage children's nervous systems and contaminate the water supply.
Fish tissue analysis indicated high concentrations of PCBs, mercury, DDT, dieldrin
, chlordane and dioxins.
1981 Ban on the use of the organochlorine pesticide Dieldrin