Fig. 1: Hydrogen suphide concentrations over 28 days.

Aqueous sulphide measurements (SULF, µmol L^–1) for the biotic condition over 28 days (nb. measured the anaerobic nutrient-enriched artificial seawater media dosed bi-weekly with glutaraldehyde in situ adjacent to corroding UNS G10180 carbon steel). Dash vertical lines indicate biocide dosing time points.