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Fig. 2. Calibration of the polarographic sulfide sensor, PSS. A typical calibration curve is derived from sequential injections (inset) of Na2S stock into anoxic 20 mmol l–1 Tris at pH 7.0. A linear regression fits the PSS signals at <200 µmol l–1 sulfide, whereas a second order polynomial fits the PSS signals above this concentration.





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