Assertion: arsenic's use | /r/HasProperty | reported by several workers
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Source sentences:
text: The use of soil washing to remediate contaminated fine-grained soils that contained more than 30% fines fraction has been reported by several workers [113–115]. Khodadoust et al.  have also studied the removal of various metals (Pb, Ni, and Zn) from field and clay (kaolin) soil samples using a broad spectrum of extractants (chelating agents and organic acids).