Flow Injection Analysis of Sulfate with a Potentiometry-Based Linear Calibration Graph

Based on the behavior of lead ion selective electrode (Pb ISE) and the interaction between a sulfate-containing solution and solid lead sulfate, equations describing the explicit linear relationships between the measured potential of Pb ISE and the sulfate concentration in sample solutions were derived and applied to the determination of sulfate by the flow injection analysis technique. These proposed procedures improved the sensitivity of the potentiometric method and the reliability of the analytical results. With a mixed solvent system (35 vol % methanol) a detection limit as low as 1.0 x 10 -6 M can be obtained optimistically.

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