Figure 7
From: Stable isotope evidence for the Bottom Convective Layer homogeneity in the Black Sea
Possible residual sulfate fraction in the BCL was calculated by Rayleigh distillation model assuming that the sulfur isotope composition in sulfate changes from +21 ± 0.4 (2σ) ‰ in aerobic zone to +23 ± 0.4 (2σ) ‰ in anaerobic one due to sulfate reduction. Change of sulfate mass fraction loss is shown for fractionation factor α = 1.0664 ± 0.0012 (2σ) calculated as the average of all samples from BCL. It is also shown 2 σ confidence intervals for the average δ34S (SO4) values (dash line) and for the enrichment factor (thin lines).