Figure 3: Normalized second-derivative absorbance as a function of salinity: values for - (second-derivative values at 250 nm for media (N and AC, respectively)) are represented by diamonds and correspond to total sulfide (H2S/HS/S2−). Values (second-derivative values at 278 nm for media H and representing total sulfite: SO2/HSO3/SO32−) and (second-derivative values at 250 nm for media AC and representing total thiosulfate: H2S2O3/HS2O3/S2O32−) are represented by squares and triangles, respectively.