Review recommends more analysis of MPCA’s work on sulfates and wild rice
The experts recommended examining data from recent Minnesota field studies that use more sophisticated models.
Stephanie Hemphill
Activists put pressure on MPCA to deal with mercury pollution
Some in northeastern Minnesota want the state to move faster to reduce mercury pollution in the St. Louis River.
Experts offer mixed review of state’s efforts to gauge impact of sulfates on wild rice
A team of international experts found plenty to like, and plenty to criticize, in their examination of MPCA’s research.
Scientific peers to review MPCA’s analysis of wild rice, sulfate research
The research was designed to determine whether Minnesota’s current sulfate standard for wild rice waters is right.
Tribal efforts — and influence — on environmental policy are growing
Through a series of legal victories, including one just weeks ago, tribes are extending the meaning of rights they reserved in 19th-century treaties.
MPCA issues early analysis of study on sulfates and wild rice
The agency concluded that the range at which sulfide limits the plants’ ability to grow corresponds to a range of sulfate in the surface water of 4 to 16 milligrams per liter – neatly bracketing the current standard.
Current sulfate standard is about right to protect wild rice, research indicates
“We found there really is no threshold at which sulfide becomes toxic,” said researcher John Pastor. “As soon as you add any, you get a decline in growth rate.”
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