DDTDDT

Tomáš PokornýTomáš Pokorný

PropertiesPropertiesChemical nameChemical name 4,4'-(2,2,2-trichloroethane-4,4'-(2,2,2-trichloroethane-

1,1-diyl)bis(chlorobenzene) 1,1-diyl)bis(chlorobenzene)

Chemical formulaChemical formula CC1414HH99ClCl5 5

Molecular massMolecular mass 354.49 g/mol 354.49 g/mol

Melting pointMelting point 108.5 °C 108.5 °C

Boiling PointBoiling Point 260 °C 260 °C

CAS NumberCAS Number 50-29-3 50-29-3

Anofex, Cesarex, Chlorophenothane, Dedelo, p,p'-DDT, Dichlorodiphenyltrichloroethane, Dinocide, Didimac, Digmar, ENT 1506, Genitox, Guesapon, Guesarol, Gexarex, Gyron, Hildit, Ixodex, Kopsol, Neocid, OMS 16, Micro DDT 75, Pentachlorin, Rukseam, R50 and Zerdane.

Nerakain

Industrial names of insecticides including DDT

HistoryHistory

1873 1873 First synthetized by Othmar ZiedlerFirst synthetized by Othmar Ziedler1939 1939 Paul Hermann MPaul Hermann Müllerüller1948 1948 Nobel PrizeNobel Prize1962 1962 Rachel Carson-DDT Persistent Rachel Carson-DDT Persistent

Organic Pollutant Organic Pollutant19701970 DDT was banned in USA DDT was banned in USA

DDT and malariaDDT and malariaCaused by Caused by protozoan parasites protozoan parasites Transmitted by female of Transmitted by female of Anopheles mosquitoAnopheles mosquitoDDT is most affective insecticide DDT is most affective insecticide against Anopheles mosquito at allagainst Anopheles mosquito at allDDT is used in 3DDT is used in 3rd rd world countriesworld countries

Environmental ImpactEnvironmental Impact

Persistent Organic PollutantPersistent Organic PollutantHalf life 15 yearsHalf life 15 yearsDDT and its metabolic products DDT and its metabolic products accumulate through the food chainaccumulate through the food chain DDT is very highly toxic to aquatic lifeDDT is very highly toxic to aquatic life DDT becomes more concentrated in DDT becomes more concentrated in animals higher on the food chain; such as animals higher on the food chain; such as Humans.Humans.

Arguments for and against DDTArguments for and against DDT ForForSince the ban, two million people a year have died Since the ban, two million people a year have died unnecessarily from malaria, mostly children. The ban unnecessarily from malaria, mostly children. The ban has caused more than fifty million needless deaths. has caused more than fifty million needless deaths. Banning DDT killed more people than Hitler. (Michael Banning DDT killed more people than Hitler. (Michael Crichton-State of Fear-page 487)Crichton-State of Fear-page 487)At least twice cheaper than other insecticidesAt least twice cheaper than other insecticides

AgainstAgainstEnvironmental ImpactEnvironmental Impact

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