Endosulfan is a derivative of hexachlorocyclopentadiene, and is chemically similar to aldrin, chlordane, and heptachlor.
12.
Animals exposed to Heptachlor epoxide during gestation and infancy are found to have changes in nervous system and immune function.
13.
The US EPA has limited the sale of heptachlor products to the specific application of fire ant control in underground transformers.
14.
Some of these pollutants are DDT, aldrin, chlordane, dieldrin, endrin, heptachlor, hexochlorobenzene, and toxaphene.
15.
In 1962, Rachel Carson's " Silent Spring " questioned the safety of heptachlor and other chlorinated insecticides.
16.
The presence of DDT and heptachlor residues indicates that the contraband highly toxic pesticides are still being used indiscriminately, the study said.
17.
Five others _ the pesticides chlordane, dieldrin, heptachlor and mirex and the industrial byproduct hexachlorobenzene _ were chosen for elimination with limited exemptions.
18.
The popularity of these insecticides increased after many of the organochlorine insecticides such as DDT, dieldrin, and heptachlor were banned in the 1970s.
19.
Some pesticides, including aldrin, chlordane, DDT, dieldrin, endrin, heptachlor, hexachlorobenzene, mirex and toxaphene, are considered POPs.
20.
One of the samples contained heptachlor residue of 0.789 microgram per litre while DDT in another sample measured 1.527 microgram per litre.
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