Abstract
The isoefectric points of synthetic greigite, Fe&, and pyrrhotite, Fe, _& in 10 -3- 1.1 10 -* M
NaCl solution at or, < lop4 and as < 10W4 were determined to be pH 3 and 2, respectively. Below pH 2
for pyrrhotite and below pH 3 for greigite, the surfaces are positively
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