Assertion: metal's compound | /r/HasProperty | arsenic
Facets:
value: possibly
type: DEGREE
Source sentences:
text: Arsenic and antimony compounds are especially toxic; boron, silicon, and possibly arsenic, are essential trace elements.
text: Arsenic compounds of particular importance in agriculture are arsenic acid (H 3 AsO 4 ) and such salts as lead arsenate (PbHAsO 4 ) and calcium arsenate [Ca 3 (AsO 4 ) 2 ], which are useful for sterilizing soils and controlling pests, respectively.