Adnan KENAR, Emine İlknur ÜNAL, Mustafa TAŞTEKİN, Mehmet Levent AKSU

Spectrophotometric methods for the determination of fluoride ion using indole-3-acetic acid interaction with iron(III)

: This study is related to the determination of fluoride ion by the conversion of pink-colored Fe(III) and indole3-acetic acid (IAA) into a colorless hexafluoride ferrite complex with the addition of fluoride. The optimum conditionsof the complex formation were found to be pH 1.7 and a temperature of 60 °C. The maximum absorption wavelengthof the complex and the detection limit of the method were 525 nm and 0.26 mg/L, respectively. The interfering effects of the different cations (Ag + , Al 3+ , Ba 2+ , Ca 2+ , Cd 2+ , Co 2+ , Cu 2+ , K + , Mg 2+ , Na + , Ni 2+ , Pb 2+) and anions(SO2−4, SO2−3, NO −2, I − , Br − , Cl − , SCN − , CH3 COO − , H2PO −4, ClO −4) were also investigated. The method was applied to standard and real samples and the resulting data were statistically compared at a confidence level of 95% with those obtained with the use of a fluoride-selective electrode.

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