Environmental Science · Water Science and Technology
Wastewater at three rural sewer sites in Freiburg, Germany, contained more trifluoroacetate than could be accounted for by drinking water, groundwater, rainwater and estimated dietary intake. The researchers say other human-use sources, including cosmetics, may contribute, but more data are needed.
A systematic review and meta-analysis examined how silver diamine fluoride affects human dental pulp cells in laboratory studies. Across seven in vitro studies, higher concentrations were associated with lower cell viability, but these findings do not show how the material affects dental pulp in people.
A filter combining bone char and hydroxyapatite removed high levels of fluoride from groundwater in laboratory tests and an Ethiopian field study. In the village trial, it lowered fluoride from 9.46 to 0.14 milligrams per liter and more than doubled the time between adsorbent replacements.
