2,4-D formulations include esters, acids, and several salts, which vary to a lesser extent in toxicity.
The dimethyl-amine salt (DMA) and 2-ethylhexyl ester (EHE) forms account for approximately 90-95% of the total global use
Absorption of salt forms is slower relative to phenoxy acetic acid
Reference
Harris SA, Solomon KR (1992). Percutaneous penetration of 2,4-dichlorophenoxyacetic acid and 2,4-D dimethylamine salt in human volunteers. J Toxicol Environ Health 36 (3): 233-240 . . .
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