Abstract
AbstractAn improved photo‐cured membrane selective to calcium was developed based on the calcium bis[4‐(l, 1,3,3‐tetramethylbutyl)phenyl] phosphate ionophore and incorporates the lipophilic additive, potassium tetrakis(p‐chloropheny1)borate. The calcium electrode exhibited a hyper‐Nernstian response of 31.0 mV change per activity decade and a log‐linear range between 1 × 10−5 to 0.1 M in pure calcium chloride solution, in steady‐state mode. The calcium electrode was fast responding, reaching 90% of steady‐state value in 5s making it ideal for flow injection measurements. The photo‐cured electrode can measure calcium in a high perchlorate background, and was used to determine the total calcium level in full cream milk that was digested by a nitric/perchloric acid mixture. The results obtained were in good agreement with atomic absorption spectroscopy measurements.
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