A novel ferroin membrane sensor for potentiometric determination of iron

Saad S.M. Hassan, Sayed A.M. Marzouk

Research output: Contribution to journalArticlepeer-review

80 Citations (Scopus)


A novel potentiometric approach for both batch and flow injection determination of iron(II) and/or iron(III) is described. It is based on the formation and monitoring of ferroin with a PVC membrane sensor containing ferroin-TPB as an electroactive component plasticized with 2-nitrophenyl phenyl ether. The sensor exhibits fast Nernstian response for ferroin with a cationic calibration slope of 30 ± 0.2 mV/concentration decade down to 4 × 10-7M ferroin (0.03 ppm Fe) at pH 3-9. Interferences from common inorganic cations are negligible or can be eliminated by a pretreatment with DDC. The ferroin sensor was successfully applied to the determination of iron contents in water, alloys, rocks and pharmaceuticals. The results show good correlation with data obtained by the standard spectrophotometric ferroin method, the coefficient of correlation is better than 0.7%.

Original languageEnglish
Pages (from-to)891-899
Number of pages9
Issue number6
Publication statusPublished - Jun 1994
Externally publishedYes

ASJC Scopus subject areas

  • Analytical Chemistry


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