Research Article
A Solid Binding Matrix/Mimic Receptor-Based Sensor System for Trace Level Determination of Iron Using Potential Measurements
Table 1
Response characteristics of ferroin-IIP PVC membrane sensors.
| Membrane composition/
parameter | ISE I | ISE II | ISE III | ISE IV | ISE V | ISE VI | ISE VII | ISE VIII | ISE IX | ISE X | ISE XI |
| | Ionophore | IIP | IIP | NIP | NIP | — | Fe°Phe | Fe°Cyc | Fe°PClPB | Fe°Phe | Fe°Cyc | Fe°PClPB | | Additive | Tk4ClPB | — | Tk4ClPB | — | Tk4ClPB | Tk4ClPB | Tk4ClPB | Tk4ClPB | Tk4ClPB | Tk4ClPB | Tk4ClPB | | Plasticizer | o-NPOE | o-NPOE | o-NPOE | o-NPOE | o-NPOE | DBP | DBP | DBP | bEHS | bEHS | bEHS |
| | Slope (mV decade−1)* | | | | | | 33.3 | 35.8 | 37.9 | 33.6 | 36.1 | 38.6 | | Correlation coefficient ()* | 0.9970 | 0.9979 | 0.9998 | 0.9986 | 0.9991 | 0.991 | 0.990 | 0.993 | 0.994 | 0.991 | 0.991 | Lower limit of linear range
(mol L−1) | 1.78 × 10−7 | 1.81×10−6 | 1.78 × 10−7 | 2.31 × 10−6 | 1.78 × 10−7 | 8.99 × 10−5 | 3.00 × 10−5 | 5.00 × 10−5 | 5.00 × 10−5 | 5.00 × 10−5 | 3.00 × 10−5 | | Detection limit (ng mL−1) | 0.05 | 0.50 | 0.05 | 0.64 | 0.05 | 3.91 | 4.39 | 4.39 | 10.56 | 6.22 | 5.56 | | Response time for 10−5 M (sec) | 20 | 30 | 20 | 30 | 20 | 20 | 30 | 20 | 30 | 20 | 20 | | Recovery time (sec) | 30 | 50 | 30 | 50 | 30 | 30 | 50 | 30 | 50 | 30 | 30 | | Working pH range | 3–6 | 3–6 | 3–6 | 3–6 | 3–6 | 4–12.5 | 4–12.5 | 4–12.5 | 2.5–6 | 4–12.5 | 2.5–6 |
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*Average of three measurements.
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