Fluoride determination in some mouth wash preparations by a novel La(III) graphite coated membrane sensor based on amitraz [An article from: Analytica Chimica Acta]

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Description:
Solution studies on the binding properties of N-2,4-dimethylphenyl-N'-ethylformamidine (amitraz) toward nine lanthanide ions including lanthanum, cerium, neodium, samarium, europium, gadolinium, terbium, dysprosium, ytterbium and some other transition and heavy metal ions such as copper, lead, cobalt, nickel ions, showed a selective 1:1 complexation between amitraz and lanthanum ions. Consequently, amitraz was applied as an ion carrier in construction of a novel poly(vinyl chloride) membrane sensor for La(III). The sensor has a linear dynamic range of 1.0x10^-^1 to 1.0x10^-^7M with a Nernstian slope of 19.8+/-0.2mV per decade and a detection limit of 8.0x10^-^8M. The proposed sensor displays a fast response time (