Sulfide chemistry essentially removes many heavy metals  irreversiblely from liquid to solid phase. This is a natural phenomenon as well as point point source treatment and many other associated technologies. Essential for point source removal of heavy metals. See Japan Mercury problems in 50's and 60's.

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Sulfide chemistry essentially removes many heavy metals  irreversiblely from liquid to solid phase. This is a natural phenomenon as well as point point source treatment and many other associated technologies. Essential for point source removal of heavy metals. See Japan Mercury problems in 50's and 60's.