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Dibromophos

Organic compound

This entry is made by Compilation and application of scientific encyclopedia entries of "Science Popularization China" to examine.

Dibromophos is an organic compound with chemical formula C four H seven Br two Cl two O four P，

The pure product is white crystal anhydrous It is stable under normal conditions and decomposes rapidly in water. Generally, it can decompose more than 90% within 48 hours under normal temperature high temperature And alkaline conditions. It is low toxic to humans and animals, strong toxic to bees, and irritating to human eyes and mucous membranes. Dibromophos is a kind of dichlorvos And bromine Reactive Organophosphorus Insecticide. High efficiency, wide spectrum Touch kill It is mainly used, with stomach poison and fumigation. The residual effect period is short, and it will become invalid 1-2 days after application at normal temperature.

Chinese name: Dibromophos
Foreign name: Naled^[3]
Alias: Dibromide^[4] 、 O , O -Dimethyl- O -(1,2-dibromo-2,2-dichloroethyl) phosphate
chemical formula: C four H seven Br two Cl two O four P
molecular weight: three hundred and eighty point seven eight four
CAS login number: 300-76-5^[2-3]
EINECS login number: 206-098-3

Melting point: 26.5 to 27.5 ℃
Boiling point: 273.8 ℃
Water solubility: Insoluble
Density: 2.032 g/cm³
Appearance: Colorless viscous liquid or white crystalline powder
Flash point: 119.4 ℃
Application: Organophosphorus insecticide
Security description: S36/37；S61
Hazard description: R21/22

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Physical and chemical properties

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Density: 2.032 g/cm three

Melting point: 26.5-27.5 º C

Boiling point: 273.8 º C

Flash point: 119.4 º C

Refractive index: 1.528

Saturated vapor pressure: 0.066kPa (110 ℃)

Appearance: colorless viscous liquid or white crystalline powder

Solubility: insoluble in water, soluble in aromatic hydrocarbon, insoluble in fat^[1]

Molecular structure data

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Molar refractive index: 57.77

Molar volume (cm three /mol）：187.3

Isotonic specific volume (90.2K): 496.0

Surface tension (dyne/cm): 49.1

Polarization (10 -24 cm three ）：22.90^[1]

Calculate chemical data

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Reference value for drainage parameter calculation (XlogP): 2.5

Number of hydrogen bond donors: 0

Number of hydrogen bond receptors: 4

Number of rotatable chemical bonds: 5

Number of tautomers: none

Topological molecular polar surface area: 44.8

Number of heavy atoms: 13

Surface charge: 0

Complexity: 206

Number of isotope atoms: 0

Determine the number of atomic structure centers: 0

Number of uncertain atomic structure centers: 1

Determine the number of chemical bond structure centers: 0

Number of uncertain chemical bond structure centers: 0

Number of covalent bond units: 1^[1]

toxicology data

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1. Acute toxicity

LD fifty : 430mg/kg (rat by mouth); 1100mg/kg (rabbit percutaneous)

2. Irritation

Rabbit percutaneous: 500mg (24h), severe irritation.

3. Mutagenicity

Microbial mutagenesis: Salmonella typhimurium 50 μ g/plate.

Microbial mutagenesis: 50 μ g/dish of subtilis.^[1]

Ecological data

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1. Ecotoxicity

LC fifty : 0.127mg/L (96h) (mountain trout, static); 0.132mg/L (96h) (rainbow trout); 3.3mg/L (96h) (black headed fish, static); 0.18mg/L (96h) (bluegill sunfish).

EC fifty : 0.3ppb (48h) (Daphnia, static); 1.5ppb (48h) (Daphnia, dynamic).

2. Non biodegradable

In the air, when the concentration of hydroxyl radical is 5.00 × 10 five Pcs/cm three The half-life of degradation is 2.5d (theoretical).

application

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Dibromophos is an internally absorbed insecticide and acaricide, which has the effects of contact, stomach toxicity, and fumigation, and is used to control pests of vegetables, fruit trees and other crops to be harvested,.

usage method

1. To control onion thrips, vegetable moths, greenhouse whitefly, and vegetable aphids, spray with 1500-2000 times 50% emulsifiable concentrates.

2. To prevent cotton spider, spray with 2000 times 50% emulsifiable concentrates.

3. To control Pieris rapae, yellow striped flea beetle and Spodoptera litura, spray 1500 times 50% emulsifiable concentrate at the young stage.

matters needing attention

1. The aqueous solution is easy to decompose, so it should be prepared and used as needed.

2. It cannot be mixed with alkaline pesticides.

3. It is highly irritating to human skin and eyes, and should be protected during use.

4. The beans and melons should be used with caution. Because this product is easy to cause drug damage in beans and melons, it should be used with caution. It is better to use other killing agents.

5. It is highly toxic to bees and is not suitable for medication during flowering.

Emergency treatment

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Leakage emergency treatment

Evacuate the contaminated area quickly and strictly restrict access. Cut off the ignition source and do not directly contact the leakage.

Small amount of leakage: absorb or absorb with sand or other incombustible materials.

Large amount of leakage: build a dike or dig a pit to receive; Cover with foam to reduce steam disaster. Transfer to tank car or special collector with pump, and recycle or transport to waste disposal site for disposal. If it is solid, use a clean shovel to collect it in a dry, clean and covered container. In case of large leakage, collect and recycle or transport to waste disposal site for disposal.

Protective measures

Respiratory system protection: wear filter type gas mask (half mask) during production operation or agricultural use. Self contained breathing apparatus must be worn when the concentration in the air is high.

Eye protection: wear chemical safety goggles.

Body protection: wear polyethylene gas protective clothing.

Hand protection: wear neoprene gloves.

Others: The combination of plastic film and soaping cloth can also be used for skin protection. After work, take a shower and change clothes. Pay attention to personal hygiene.

First aid measures

Skin contact: immediately take off the contaminated clothes, and thoroughly wash the contaminated skin, hair, nails, etc. with soapy water and flowing water. Get medical attention.

Eye contact: Lift the eyelid and flush with flowing water or physiological saline. Get medical attention.

Inhalation: quickly leave the site to a place with fresh air. Keep the respiratory tract unobstructed. If breathing is difficult, give oxygen. If breathing stops, perform artificial respiration immediately. Get medical attention.

Ingestion: drink enough warm water, induce vomiting, and wash stomach with clean water or 2%~5% sodium bicarbonate solution. Get medical attention.

Fire fighting method: firefighters must wear gas masks and full body fire-fighting clothes. Use dry powder, sand, foam and carbon dioxide extinguishers to extinguish the fire.