title: ω-Thio nitrilotriacetic chemically modified gold electrode for iron determination in natural waters with different salinity.
abstract: The preparation, characterization and analytical application of a chemically modified gold electrode (CME), based on ω-thio nitrilotriacetic acid derivative (N-[5-[[[[20-(acetylthio)-3,6,9-trioxaeicos-1-yl]oxo]carbonyl]amino]-1carboxypentyl]iminodiacetic acid) self-assembled monolayer (SAM), have been described. The electrode has been characterized by electrochemical techniques and tested for its response towards metallic ions, demonstrating to be effective for the determination of ionized iron at sub-μg L(-1) level by differential pulse cathodic stripping voltammetry (DPCSV). The analytical response towards iron in natural water (tap water, marine water) and the interference of ions usually present and chelating agents (humic acids and EDTA as model ligand of high complexing capacity) have been evaluated.
authors.affiliation: Dipartimento di Chimica, Università degli Studi di Pavia, V.Le Taramelli 12, 27100 Pavia, Italy. Electronic address: daniele.merli@unipv.it.
authors.forename: Daniele
authors.initials: D
authors.lastname: Merli
authors.affiliation: Dipartimento di Chimica, Università degli Studi di Pavia, V.Le Taramelli 12, 27100 Pavia, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Ravasio
authors.affiliation: Dipartimento di Chimica, Università degli Studi di Pavia, V.Le Taramelli 12, 27100 Pavia, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Protti
authors.affiliation: Dipartimento di Chimica, Università degli Studi di Pavia, V.Le Taramelli 12, 27100 Pavia, Italy.
authors.forename: Maria
authors.initials: M
authors.lastname: Pesavento
authors.affiliation: Dipartimento di Chimica, Università degli Studi di Pavia, V.Le Taramelli 12, 27100 Pavia, Italy.
authors.forename: Antonella
authors.initials: A
authors.lastname: Profumo
mesh_terms: D015374:Biosensing Techniques; D002138:Calibration; D004563:Electrochemistry; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000032:analysis*; D009571:Nitrilotriacetic Acid / Q000737:chemistry*; D054712:Salinity; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D014867:Water / Q000032:analysis*
chemical_list: D013438:Sulfhydryl Compounds; D014867:Water; D006046:Gold; D007501:Iron; D009571:Nitrilotriacetic Acid
keywords: Chemically modified electrodes; Electrochemical sensors; Iron; Natural waters; Self-assembled monolayer