Drinking Water
With an LD50 of 30 mg/kg in rats, "gram quantities" of copper sulfate are potentially lethal in humans. The suggested safe level of copper in drinking water for humans varies depending on the source, but tends to be pegged at 2.0 mg/l.
Read more about this topic: Copper Toxicity
Famous quotes containing the words drinking water, drinking and/or water:
“That sound, everywhere about us, of the sea—
the tree among its tresses has always heard it,
and the horse dips his black body in the sound
stretching his neck as if towards drinking water ...”
—Denise Levertov (b. 1923)
“I drink eternally. For me it is an eternity of drinking, and a drinking up of eternity.”
—François Rabelais (1494–1553)
“To get wealth and security by guile
Is like one who pours water into a pot of unbaked clay.”
—Tiruvalluvar (c. 5th century A.D.)