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Inorganic arsenic compounds in which arsenic is present in trivalent form are known to be the most toxic (Chappell et al. 1999). Table 1 shows the acute toxicity of a number of arsenic compounds.

Table 1

Acute toxicity for different arsenic compounds (arsenic form oral LD50 (mg/kg body weight))

S. no.Arsenic compoundValue
Sodium arsenite 15–40 
Arsenic trioxide 34 
Calcium arsenate 20–800 
Arsenobetane >10,000 
S. no.Arsenic compoundValue
Sodium arsenite 15–40 
Arsenic trioxide 34 
Calcium arsenate 20–800 
Arsenobetane >10,000 

Source:Chappell et al. (1999).

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