Assertion: arsenic | /r/HasProperty | former use
Facets:
Source sentences:
text: Trivalent compounds (As; arsenic trioxide (former use in treated wood, most common arsenic form in industrial air emissions), sodium arsenite (historical herbicide and pesticide), and arsenic trichloride (chemical intermediate)) usually are judged to be more toxic than pentavalent compounds (As; arsenic pentoxide (pesticide), lead arsenate (former pesticide), calcium arsenate (former pesticide and herbicide)).