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)
“And, even yet, I dare not let it languish,
Dare not indulge in memory’s rapturous pain;
Once drinking deep of that divinest anguish,
How could I seek the empty world again?”
—Emily Brontë (1818–1848)
“We have to learn how to come out of unclean situations cleaner than we were, and even how to wash ourselves with dirty water when we need to.”
—Friedrich Nietzsche (1844–1900)