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The Minnesota Department of Health (MDH) developed a guidance value of 7 ppb (μg/L) for PFBA in drinking water. [4]
PQQ-MDH enzyme structure, with PQQ in the center. The yellow sphere represents a La 3+ ion. [1] In enzymology, a methanol dehydrogenase (MDH) is an enzyme that catalyzes the chemical reaction: CH 3 OH CH 2 O + 2 electrons + 2H + How the electrons are captured and transported depends upon the kind of methanol dehydrogenase.
Following initial discoveries of groundwater contamination in 2002, the Minnesota Department of Health conducted numerous studies –concluding in 2008, 2010, and 2014 – on the level of PFAs found in the bloodstreams of exposed residents. On February 20, 2018, the state of Minnesota settled its lawsuit against 3M in exchange for $850 million.
Drinking water quality standards describes the quality parameters set for drinking water. Water may contain many harmful constituents, yet there are no universally recognized and accepted international standards for drinking water. Even where standards do exist, the permitted concentration of individual constituents may vary by as much as ten ...
For example, Minnesota recommends a guidance value of 0.027 μg/L for PFHxS, [23] and Michigan has a screening level of 0.084 μg/L for PFHxS. [4] In 2020, Michigan adopted drinking water standards for 5 previously unregulated PFASs including PFHxS, which has a maximum contaminant level (MCL) of 51 parts per trillion (ppt) or 0.051 μg/L. [24] [25]
The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
In April 2024, Singapore and Hong Kong halted sales of some spices produced by Indian companies MDH and Everest over suspected elevated levels of ethylene oxide, a cancer-causing pesticide. In April 2024, the Singapore Food Agency and Hong Kong's Center for Food Safety banned two companies' curry powders which were found to contain ethylene oxide.
Watershed districts are special government entities in the U.S. state of Minnesota that monitor and regulate the use of water in watersheds surrounding various lakes and rivers in the state. The districts cover the natural regions of the watersheds, rather than politically defined regions and thus may have boundaries that cross jurisdictions.