why is the prolonged use of DDT not desirable
Answers
Dichlorodiphenyltrichloroethane, commonly known as DDT, is a colorless, tasteless, and almost odorless crystalline chemical compound, an organochlorine, originally developed as an insecticide, and ultimately becoming infamous for its environmental impacts. It was first synthesized in 1874 by the Austrian chemist Othmar Zeidler. DDT's insecticidal action was discovered by the Swiss chemist Paul Hermann Müller in 1939. DDT was used in the second half of World War II to control malaria and typhus among civilians and troops. Müller was awarded the Nobel Prize in Physiology or Medicine "for his discovery of the high efficiency of DDT as a contact poison against several arthropods" in 1948.[5]
DDT
Chemical structure of DDT
DDT-from-xtal-3D-balls.png
DDT-from-xtal-3D-vdW.png
Names
Preferred IUPAC name
1,1′-(2,2,2-Trichloroethane-1,1-diyl)bis(4-chlorobenzene)
Identifiers
CAS Number
50-29-3 ☑
3D model (JSmol)
Interactive image
ChEBI
CHEBI:16130 ☑
ChEMBL
ChEMBL416898 ☒
ChemSpider
2928 ☑
ECHA InfoCard
100.000.023
KEGG
D07367 ☑
PubChem CID
3036
UNII
CIW5S16655 ☑
InChI
InChI=1S/C14H9Cl5/c15-11-5-1-9(2-6-11)13(14(17,18)19)10-3-7-12(16)8-4-10/h1-8,13H ☑
Key: YVGGHNCTFXOJCH-UHFFFAOYSA-N ☑
InChI=1/C14H9Cl5/c15-11-5-1-9(2-6-11)13(14(17,18)19)10-3-7-12(16)8-4-10/h1-8,13H
Key: YVGGHNCTFXOJCH-UHFFFAOYAJ
SMILES
Clc1ccc(cc1)C(c2ccc(Cl)cc2)C(Cl)(Cl)Cl
Properties
Chemical formula
C14H9Cl5
Molar mass
354.48 g·mol−1
Density
0.99 g/cm3
Melting point
108.5 °C (227.3 °F; 381.6 K)
Boiling point
260 °C (500 °F; 533 K) (decomposes)
Solubility in water
25 μg/L (25 °C)[1]
Hazards
Main hazards
Toxic, dangerous to the environment, likely carcinogenic
GHS pictograms
The skull-and-crossbones pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)The health hazard pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)The environment pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)
GHS signal word
Danger
GHS hazard statements
H301, H351, H372, H410
GHS precautionary statements
P201, P202, P260, P264, P270, P273, P281, P301+310, P308+313, P314, P321, P330, P391, P405, P501
NFPA 704
NFPA 704 four-colored diamond
220
Flash point
72–77 °C; 162–171 °F; 345–350 K [3]
Lethal dose or concentration (LD, LC):
LD50 (median dose)
113–800 mg/kg (rat, oral)[1]
250 mg/kg (rabbit, oral)
135 mg/kg (mouse, oral)
150 mg/kg (guinea pig, oral)[2]
US health exposure limits (NIOSH):[4]
PEL (Permissible)
TWA 1 mg/m3 [skin]
REL (Recommended)
Ca TWA 0.5 mg/m3
IDLH (Immediate danger)
500 mg/m3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
By October 1945, DDT was available for public sale in the United States. Although it was promoted by government and industry for use as an agricultural and household pesticide, there were also concerns about its use from the beginning.[6] Opposition to DDT was focused by the 1962 publication of Rachel Carson's book Silent Spring. It cataloged environmental impacts that coincided with widespread use of DDT in agriculture in the United States, and it questioned the logic of broadcasting potentially dangerous chemicals into the environment with little prior investigation of their environmental and health effects. The book claimed that DDT and other pesticides had been shown to cause cancer and that their agricultural use was a threat to wildlife, particularly birds. Its publication was a seminal event for the environmental movement and resulted in a large public outcry that eventually led, in 1972, to a ban on DDT's agricultural use in the United States.] A worldwide ban on agricultural use was formalized under the Stockholm Convention on Persistent Organic Pollutants, but its limited and still-controversial use in disease vector control continues,[8][9] because of its effectiveness in reducing malarial infections, balanced by environmental and other health concerns.
Along with the passage of the Endangered Species Act, the United States ban on DDT is a major factor in the comeback of the bald eagle (the national bird of the United States) and the peregrine falcon from near-extinction in the contiguous United States
Hello your answer
DDT was commonly used pesticides it was effective..it was Mainly used To prevent body lice,typhus,malaria..
In short...
The prolonged use of DDT is not desirable because it is useful and effective...
Thanks .