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Polypyrroles' affinity for ions have been exploited for ion Sensing, However, its feasibility in practical use is largely limited by its sparing selectivity and ionic interference. In light of these inadeguacies, part I in this thesis pursues a wider specturm of selectivities such as phenylpyrrole and Dimethylaminopyrrole. Results indicate that Dimethylaminopyrrole qualifies sensing element in its own right, while Phenylpyrrole is handicapped by its susceptibility to interferences from a great number of ions, and more severely by its short shelflife.
Part II. studies selectivity of various polypyrroles for cations and anoins.
The decending order of interference for cations are:
Ppy/N03-: Pb2+ > Ca2+ > Mg2+
Ppy/DS-: Pb2+ > Ca2+ > Mg2+
Ppy/TOS-: Cu2+ > Pb2+ > Ca2+ > Mg2+
The decending order of interference for anions are:
Ppy/NO3-: ClO4- > N02- > Cl- >> SO42-
Ppy/DS-: Cl- > C104- > SO42- > NO2-
Ppy/TOS-: N02- > Cl- > ClO4- > SO42-
Part III. Compares Ppy sensors in the detection of phenols pollutant with the standard HPLC method. As it turns out that inferior results for method detection limit (26ppbv vs HPLC's 10 ppbv), prevision (13.20% vs 1.5%) and accuracy (76.8~131.89% vs 90-100%) are obtained. Northeless, the potentiometric method employing Ppy sensor is simple and fast, which nught he useful for sample or on site monitoring.
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