Appendix - Data 
Table 1: Measured metal concentrations in surface water sampled in and around 
offshore wind farms in the North Sea during ship campaigns from 2016 to 2020, in 
comparison with data from the long-term marine environmental monitoring by BSH 
(2010 to 2014, Zn = zinc, Cd = cadmium, Pb = lead, In = indium, Ga = gallium) and 
in comparison with data from literature studies respectively (Kremling et al. 1999, 
Al = aluminium). 
Soncentration Concentration 
‚ange [ng/L] range [ng/L] 
Concentration Concentration Known variability in 
range [ng/L] range [ng/L] North Sea [ng/L] 
Year 2016 
2018 
2019 
2020 
Zn 306-795 440-2180 
Cd 10-18 
490-1860 
247-841 
63-3800 
20-41 
17-37 
12-52 
Pb 2-17 
Al 78-292 170-530 210-670 < 450 8-1200 
In 0.05-0.15 < 0.05 0.01-0.07 0.03-0.27 unknown 
Ga 2-4 
<10 
Fr 
1_4 
unknown 
Appendix - Publications 
Kirchgeorg, T., Weinberg, |., Hörnig, M., Baier, R., Schmid, M.J., Brockmeyer, B. (2018): Emissions from 
corrosion protection systems of offshore wind farms: Evaluation of the potential impact on the marine 
environment. Marine Pollution Bulletin, Volume 136, 257-267, doi:10.1016/j.marpolbul.2018.08.058 
Reese, A., Voigt, N., Zimmermann, T., Irrgeher, J., Pröfrock, D. (2020): Characterization of alloying com- 
ponents in galvanic anodes as potential environmental tracers for heavy metal emissions from offshore 
wind structures. Chemosphere, Volume 257, 127182, doi:10.1016/i.chemosphere.2020.127182 
Zimmermann, T., von der Au, M., Reese, A., Klein, O., Hildebrandt, L., Pröfrock, D. (2020): Substituting 
HF by HBF4 — an optimized digestion method for multi-elemental sediment analysis via ICP-MS/MS. 
Anal. Methods, 2020, doi:10.1039/D0AY01049A 
Ebeling, A., Zimmermann, T., Klein, O., Irrgeher, J., Pröfrock, D. (2022): Analysis of Seventeen Certified 
Water Reference Materials for Trace and Technology-Critical Elements. Geostandards and Geoanalyti- 
cal Research, 46, 2, 351 —- 378, doi:10.1111/ggr. 12422 
Investigation of potential environmental emissions from cathodic corrosion protection systems used in 
North Sea offshore wind farms - Part 1. Trace metal distribution in the water body, in progress 
Investigation of potential environmental emissions from cathodic corrosion protection systems used in 
North Sea offshore wind farms - Part 2. Trace metal distribution in the sediment, in progress 
Table 2: Measured mass fractions of metals in surface sediments (< 20um fraction) 
sampled in and around offshore wind farms in the North Sea during ship campaigns 
from 2016 to 2020 in comparison with data from the long-term marine environmental 
monitoring by BSH (2010 to 2016). 
Range of mass Range of mass Range of mass Range of mass Known variability in 
fractions [mg/kg] fractions [mg/kg] fractions [mg/kg] fractions [mg/kg] North Sea [mg/kg] 
Year 2016 
Zn 200-790 
Cd 0.2-0.8 
Pb 95-371 
Al no Data 2.2-5.9 % 1.3-9.0 % 5.8-9.0 % 5.4-8.9 % 
in 0.08-0.19 0.08-0.14 
16-27 
Aa 
0.065-0.187 0.11-0.27 unknown 
11-09 
8.6-19.6 
unknown