Common Name

Chlorpyrifos

CAS NO.

2921-88-2

Description

Appearance:Light yellow to white crystal

Melting Point:42~43.5

Vapour Pressure:2.7mPa 

Solubility:0.0014g/L in water,readily soluble in most organic solvents.

Formulation

98%TC, 480g/l EC

Application

A broad-spectrum hight-effective,low toxic systemic insecticide.It can be used to control aphids,leafhoppers,

whitefly thrips,etc.on different plants.

Manufacture and use

Chlorpyrifos is manufactured by reacting 3,5,6-trichloro-2-pyridinol with diethylthiophosphoryl chloride.

Chlorpyrifos is normally supplied as a 23.5% or 50% liquid concentrate. The recommended concentration for direct-spray pin point application is 0.5% and for wide area application a 0.03 – 0.12% mix is recommended.

Physico-chemical properties

Appearance: Technical chlorpyrifos is white crystalline solid with a mild sulfur odor.

Stability: Wide stability at room temperature.

Density: 1.398(43.5°C).

Melting Point: 41.5~43.5°C.

Vapour Pressure: 2.5mPa(25°C).

Solubility: 1.2mg/l in water, readily soluble in most organic solvents

Toxicity

Chlorpyrifos is moderate toxic to animals. Acute oral LD50 for rats 163mg/kg, acute dermal LD50 for rats>2g/kg; Slight irritation to eye, serious to skin. Subacute oral non-effect level for rats 0.03mg/kg, chronic oral non-effect level 0.1mg/kg. Chronic oral non-effect level for dog 0.03mg/kg. No carcinogenic, mutagenic and teratogenic effects at experimental dosage. Maximum allowed concentration0.2mg/m3 (TLV) in indoor air. High toxic to fish and aquatic organisms, LD50 for bulltrout 15mg/l (96 h, 72°C). Toxic to bees. Acute oral LD50 of 40.7% chlorpyrifos EC for rats 590mg/kg, acute dermal for rabbits LD50 2330mg/kg, irritation to skin and eyes. Acute oral of 14% G for rats LD50>2g/kg, acute dermal for rats LD50>2g/kg, acute inhale LD50>0.007µg/L(7 h), irritation to eyes and skin.

Usage

  Thiophosphate insecticide; Contact, stomach, and respiratory action.
Non persistent on leaves, persistent in soil, high efficiency for the control of underground pests. At the recommended dosage, no phytotoxicity for most crop, but sensitive to tobacco.