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Fig. 4. The polarographic sulfide sensor (PSS) signal is dependent on solution pH (5.5–8.5) with increased sensitivity of the PSS at lower pH. The titration at a specific sulfide concentrations (10–200 µmol l–1) over a pH range (inset) illustrates the pK for H2S /HS– to be near 6.75 at 20°C and that the PSS is detecting only H2S.