2,4-DB

Synonyms

4-(2,4-Dichlorophenoxy)butyric acid; 2,4-D butyric acid; 2,4-DM; 4-(2,4-Dichlorophenoxy)butanoic acid; Buratal; Butirex; Butormone; Butyrac; Butyrac 118; Butyrac 200; Butyrac ester; Kyselina 4-(2,4-dichlorfenoxy)maselna [Czech]; Legumex D; Sys 67 Buratal; gamma-(2,4-Dichlorophenoxy)butyric acid; Butanoic acid, 4-(2,4-dichlorophenoxy)- (9CI); Butyric acid, 4-(2,4-dichlorophenoxy)-; [ChemIDplus] UN2765

Category

Herbicides, Chlorophenoxy

Description

White to light brown solid; [HSDB] Colorless solid; [CAMEO]

Sources/Uses

Used as selective post-emergence herbicide for control of annual and perennial broad leave weeds in clovers, cereals, grassland, legumes, and groundnuts; [HSDB] Used to control broadleaf weeds in alfalfa, clover, peanuts, soybeans, peppermint, spearmint, and birdsfoot trefoil; [Reference #1]

Comments

A skin and eye irritant; The esters of 2,4-D are hydrolyzed rapidly in the body to 2,4-D; Do not accumulate in mammals; Plasma half-life is about 1 day; Analysis of 2,4-D as esters and amine salts in 1982 found the esters more highly contaminated with dioxins; [HSDB] Chlorophenoxy herbicides are possibly carcinogenic to humans (Group 2B); [IARC] See "2,3,7,8-Tetrachlorodibenzo-p-dioxin." See "2,4D."

Reference Link #1

Biomedical References

1.11E-05 mm Hg

Explanatory Notes

The Guide in the Emergency Response Guidebook is for "Phenoxy pesticides, solid, toxic."

will not burn

Hepatoxic (a) from occupational exposure (secondary effect) or (b) in animal studies or in humans after ingestion

Processes

Industrial Processes with risk of exposure:

• Farming (Pesticides)