About: http://webisa.webdatacommons.org/40520093

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Some heavy metals such as copper, iron and zinc are oligo-elements essential for plant development, however they can become toxic at higher concentrations.
http://www.w3.org/ns/prov#wasQuotedFrom	nih.gov