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Production and use statistics
From 1950 to 1980, DDT was extensively used in agriculture—more than 40,000 tonnes were used each year worldwide—and it has been estimated that a total of 1.8 million tonnes have been produced globally since the 1940s. In the U.S., where it was manufactured by Ciba, Montrose Chemical Company, Pennwalt and Velsicol Chemical Corporation, production peaked in 1963 at 82,000 tonnes per year. More than 600,000 tonnes (1.35 billion lbs) were applied in the U.S. before the 1972 ban. Usage peaked in 1959 at about 36,000 tonnes.
In 2009, 3314 tonnes were produced for the control of malaria and visceral leishmaniasis. India is the only country still manufacturing DDT, with China having ceased production in 2007. India is the largest consumer
(http://en.wikipedia.org/wiki/Environmental_impact_of_DDT)
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發表於 2012-3-15 22:17:07
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