ABSTRACT Highly selective and sensitive phosphate sensors have been fabricated by
constructing a solid membrane disk consisting of variable mixtures of aluminium
powder (Al), aluminium phosphate (AlPO4) and powdered copper (Cu).
Both binary and ternary electrode systems are produced. The ternary membranes
exhibit greater selectivity over a wide range of concentrations. The ternary
electrode with the composition 25% AlPO4, 25% Cu and 50% Al was selected as our
preferred electrode. The newly fabricated ternary membrane phosphate selective
electrodes exhibited linear potential response in the concentration range of
1.0 × 10?1 to 1.0 × 10?6 mol L?1.
The electrodes also exhibit a fast response time of <60 s. Their
detection limit is lower than 1.0 × 10?6 mol L?1.
The unique feature of the described electrodes is their ability to maintain a
steady and reproducible response in the absence of an ionic strength control.
The electrodes have a long lifetime and can be stored in air when not in use.
Cite this paper
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