Received: 19 May 2020
Accepted: 30 August 2020
First Online: 12 October 2020
Ethics approval and consent to participate
: Research was carried out with the permission of Regionalny Dyrektor Ochrony Środowiska w Bydgoszczy, Poland. WPN.6205.159.2014.KLD, WPN.6205.69.2015.KLD, and WPN.6205.44.2016.KLD, correspond to the permission for the Ciechocinek soil samples according to national guidelines. In the case of Inowrocław soil samples, permission was not required because this is a soda factory region.
: Not applicable.
: The authors declare that they have no competing interest.