Table 2.

Half-Lives and LD50 of Arsenic Species

Species	Type	Half life	Primary source	LD50
MMA	Organic	10–20 h	Food	2 mg/kg
Arsenate (V)	Inorganic	2–4 d	Water	8 mg/kg
Arsenite (III)	Inorganic	2–4 d	Water	26 mg/kg
DMA	Organic	10–20 h	Food	648 mg/kg
Arsenobetaine	Organic	4–6 h	Seafood	>4000 mg/kg

Abbreviations: MMA, monomethylarsonic acid; DMA, dimethylarsinic acid;