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CH3041
DDT V
• DDT is still used
in developing countries
to the tune of 4 000 t/y.
to the tune of 4 000 t/y.
• DDT is now found
around the planet.
Penguins in the Antarctic contain DDT.
Penguins in the Antarctic contain DDT.
• Chinese
DDT coated soil was found in brown snow deposited in Arctic Canada.
• Humans contain
around 1 ppm DDT (fat).
Mothers milk in the 1970s had 160 ppb DDT
in country areas with high use.
Mothers milk in the 1970s had 160 ppb DDT
in country areas with high use.
• Resistance was first seen in 1948.
The resistant strains of insect had a biochemical mechanism to detoxify DDT by converting it to non-toxic DDE.
The resistant strains of insect had a biochemical mechanism to detoxify DDT by converting it to non-toxic DDE.
• Initially higher
loadings were used but by
1980 400 insects sp. were resistant.
1980 400 insects sp. were resistant.
