| http://www.w3.org/ns/prov#value | - Trace element(s): For the purpose of this report and to maintain consistency with common usage, the term trace element(s) is used to refer to metals and other elements such as arsenic, antimony, selenium, and tellurium that usually are present in natural surface- and ground-water systems in concentrations less than 1 mg/L (modified from Hem, 1985).
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