Foto de stock - 07 June 2021, Bavaria, Moosinning: Werner Baltjan, an employee of the Munich Water Authority, mounts a hose during a groundwater sampling while a flow cell (front, l) and a measuring device for determining the oxygen content, the temperature, the conductivity and the pH value can be seen. With this, he prepares a sampling in which, among other things, the nitrate content of the groundwater is determined. Photo: Tobias Hase/dpa. - Moosinning/Bavaria/Germany

Imagen: 07 June 2021, Bavaria, Moosinning: Werner Baltjan, an employee of the Munich Water Authority, mounts a hose during a groundwater sampling while a flow cell.

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