A new procedure for the construction of flow-through optodes. Application to determination of copper (II)

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Abstract
A new procedure for constructing an optical fibre reflectance, bulk optode membrane type, sensor is presented. The optode membrane consists of a plasticized poly (vinyl chloride) membrane in which the ionophore is dissolved, entrapped in a cellulose support. The new optode with the dye indicator 1-(2-pyridylazo)-2-naphthol (PAN) was incorporated in a new flow-through cell and the injection system was optimized to determine Cu (II) at 567 nm in the range 5 × 10−5–10−3 M. The response was reproducible and the optode can be regenerated using 10−2 M EDTA followed by water. The method was applied to the determination of copper in real samples.