An Electrode Immobilized in a Graphite Matrix with Ion Pair Complex for the Determination of Pentachlorophenol

A simple, precise, rapid and low-cost potentiometric method for thedetermination of pentachlorophenol is proposed. a new pentachlorophenol-sensitiveelectrode was constructed by incorporating the pentachlorophenol ion pair complex withrhodamine 6g into graphite matrix. the electrode exhibited a linear response over theconcentration range of 1×10–5–5×10–2 mol/l, a detection limit of 1.7×10–6 (5.2×10–5) mol/lwith a nernstian slope of 41±1 (68±1) mv/decade. the working ph range is 7.5–10.5. theelectrode is easily constructed, has fast response time (3–10 s) and can be used for theperiod of six months without any considerable deterioration. the proposed sensor displaysgood sensitivity for pentachlorophenol.