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“Following fluoride ingestion, manganese levels were significantly reduced in liver (in 50, 100 and 200 ppm groups) and kidney (in 100 and 200 ppm groups).”
“On the other hand, bone manganese levels were significantly elevated following ingestion of 25 ppm or more fluoride.”
“The results suggest that excessive fluoride ingestion disturbs manganese metabolism.”
Environmental Science and Pollution Research • 2021 | View Paper
“Results indicate that the presence of Mn (100 mg L(-1)) and Cd (100 mg L(-1)) respectively increases the rate of fluoride sorption by a factor of ~28.3 and ~10.9, the maximum sorption capacity is increased by ~2.2 and ~1.7.”
Journal of contaminant hydrology • 2015 | View Paper
“Except for beryllium to some extent, combinations of cadmium, cobalt, iron, manganese , tin and zinc with fluoride were not as effective as aluminium in inhibiting the ATPase activity.”
“ Fluoride inhibited the utilization of glucose by the streptococci and Mn , but not calcium or magnesium, was found to counteract the inhibitory effect of fluoride.”