Figure 5
From: Activity of zero-valent sulfur in sulfidic natural waters
Activity of zero-valent sulfur vs. depth in the Cariaco Basin. From 250 to 400 m, aS0 was calculated by Method II using data from an April 2007 cruise [66]; salinity = 36.3 and T = 17.5°C. Assuming ±5% uncertainty in ΣS0 and ΣS-II measurements and a pH uncertainty of ±0.02, error bars for Method II would fall within the area of the symbols. At 400 m and deeper, aS0 was calculated from greigite solubility using data from a May 2008 cruise [60]; error bars depict only measurement uncertainty and are based on an assumption that ΣFeII and ΣS-II are measured to ±5% precision and pH to ±0.02. Log Kgreig = 2.24 was chosen to make the two methods agree at 400 m.