Continous-flow determination of phosphate using a lead ion-selective electrode

✍ Scribed by Hirokazu Hara; Suzuka Kusu

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 609 KB
• Volume: 261
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)80221-r

✦ Synopsis

The contmuous-flow determmatlon of phosphate IS described with emphasis on theoretIca calculations to explam the expenmental cahbratlon data In the determmation system, phosphate standards are mtroduced mto a reagent stream contammg Pb'+, resultmg m the formatlon of Pb&PO,), The associated decrease m free lead ion concentration IS measured by a lead Ion-selective electrode The detection hnut IS 10e6 M phosphate The result of a theoretical calculation suggests that at phosphate concentrations above 2 x 10d4 M, the potential response may not arise from free lead Ions An mterference study revealed that chloride, metasihcate and calcmm are the most slgmficant mterferents among morgamc Ions for river water analysis, whereas hydrogencarbonate, sulphate and magnesmm have much less effect