A PVC-coated carbon rod ion-selective electrode for thallium and its application to the analysis of rocks and minerals.
A new Tl(III) ion-selective electrode prepared by coating a graphite rod with a PVC membrane has been made and investigated. The optimum membrane composition is Butylrhodamine B-TlCl(-)(4) 5 mg, chlorobenzene 0.1 ml, dioctyl phthalate 0.4 ml, PVC 0.17 g. The electrode exhibits Nernstian response to Tl(III) over the concentration range 6.5 x 10(-7)-2.5 x 10(-3)M. The detection limit is 3.5 x 10(-7)M and the slope of the electrode response is 53 +/- 1 mV per decade. The electrode shows high stability and selectivity. The electrode is easy to make and store, and inexpensive.
Dan
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Department of Applied Chemistry, Chengdu College of Geology, Chengdu, Sichuan, People's Republic of China.
Dong
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