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A2336912

Chlorpyrifos solution , analyticalstandard,100ug/mlinacetone , 2921-88-2

Synonym(s):
0,0-Diethyl-O-[3,5,6-trichloro-2-pyridyl]phosphorothioate;Chlorpyriphos

CAS NO.:2921-88-2

Empirical Formula: C9H11Cl3NO3PS

Molecular Weight: 350.59

MDL number: MFCD00041800

EINECS: 220-864-4

Update time: 2022-07-08

PRODUCT Properties

Melting point: 42-44°C
Boiling point: 200°C
Density  1.398
vapor pressure  5.03 x 10-5 mmHg at 25 °C (subcooled liquid vapor pressure calculated from GC retention time data,Hinckley et al., 1990)
Flash point: 2 °C
storage temp.  APPROX 4°C
solubility  (At 25 °): 6.5, 7.9, 6.3, and 0.45 kg/kg in acetone, benzene, chloroform, and methanol, respectively (Worthing and Hance, 1991)
pka -5.28±0.10(Predicted)
form  solid
color  White to off-white
Water Solubility  Insoluble. 0.00013 g/100 mL
Merck  13,2208
BRN  1545756
Henry's Law Constant 8.19 at 5 °C, 20.7 at 15 °C, 22.7 at 20 °C, 35.5 at 25 °C, 146 at 35 °C:in 3% NaCl solution: 32.3 at 5 °C, 82.9 at 15 °C, 301 at 25 °C, 535 at 35 °C (gas stripping-GC, Cetin et al., 2006)
Exposure limits OSHA PEL: TWA 0.2 mg/m3, STEL 0.6 mg/m3; ACGIH TLV: TWA 0.2 mg/m3, STEL 0.6 mg/m3
Stability: Stable. Incompatible with strong oxidizing agents.
InChIKey SBPBAQFWLVIOKP-UHFFFAOYSA-N
LogP 5.21 at 20℃

Description and Uses

Chlorpyrifos is a chlorinated organophosphorus (OP) ester manufactured as an insecticide, acaricide, and miticide. Like the other OP insecticides, the most prominent toxicity of chlorpyrifos is associated with binding and inhibition of the enzyme acetylcholinesterase (AChE) in insects and mammals. Chlorpyrifos requires metabolic activation to chlorpyrifos oxon to yield anticholinesterase activity.
First sold in 1965, chlorpyrifos is used globally to control agricultural and structural pests and mosquitos. In the 1990s, chlorpyrifos ranked as one of the top selling pesticides in the world, for the most part, replacing the persistent organochlorine insecticides. Over the last decade, concerns regarding toxicity to the developing nervous system have limited its use. By 2001, residential uses and uses in schools and parks were prohibited, and many agricultural uses were restricted and the US Residential use limitations were also imposed in Canada, Australia, and the European Union (EU). It continues to be used in large quantities to control crop damage worldwide. In the developing countries, excessive agricultural application and lack of protective devices result in hundreds of thousands of deaths yearly.

Chlorpyrifos belongs to a class of insecticides known as organophosphates. Technical chlorpyrifos is amber to white crystalline solid with a mild sulphur odour. Formulations of chlorpyrifos include emulsifiable concentrate, dust, granular wettable powder, microcapsule, pellet, and sprays. Chlorpyrifos is widely used as an active ingredient in many commercial insecticides such as Dursban and Lorsban to control household pests, mosquitoes, and pests in animal houses. The U.S. EPA classified chlorpyrifos as GUP.

Safety

Symbol(GHS) 
GHS06,GHS09
Signal word  Danger
Hazard statements  H301-H410
Precautionary statements  P264-P270-P273-P301+P310-P391-P405
Hazard Codes  T;N,N,T,Xn,F,Xi
Risk Statements  25-50/53-36-20/21/22-11-38
Safety Statements  1/2-45-60-61-36/37-26-16
RIDADR  UN 2783
OEB C
OEL TWA: 0.2 mg/m3, STEL: 0.6 mg/m3 [skin]
WGK Germany  3
RTECS  TF6300000
HazardClass  6.1(b)
PackingGroup  III
HS Code  29333990
Toxicity LD50 orally in rats: 145 mg/kg (Schafer)

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