Geochemical data from Kiel Bight measured in sediment -slurry incubations between October 2021 and June 2022. Sediments were sampled using a multiple-corer from RV Littorina and scientific diving expeditions. The samples were measured in the laboratories of GEOMAR Helmholtz Centre for Ocean Research Kiel (Germany). Analytical detail can be found in Dale et al. (2013, DOI: https://doi.org/10.5194/bg-10-629-2013 ) and Perner et al. (2022, DOI: https://doi.org/10.3389/fmicb.2022.1096062).