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Spectrophotometric determination of ferrate (Fe(VI)) in water by ABTS.
Water Res. 2005 May; 39(10):1946-53.WR

Abstract

A new method for the determination of low concentrations (0.03-35 microM) of the aqueous ferrate (Fe(VI)) was developed. The method is based on the reaction of Fe(VI) with 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) which forms a green radical cation (ABTS(+)) that can be measured spectrophotometrically at 415 nm (ABTS method). The reaction of Fe(VI) with ABTS has a stoichiometry of 1 : 1 in excess of ABTS (73 microM). The increase in absorbance at 415 nm for ABTS*+ generation was linear with respect to Fe(VI) added (0.03-35 microM) in buffered solutions (acetate/phosphate buffer at pH = 4.3) and was (3.40+/-0.05) x 10(4) M(-1) cm(-1). The reaction of Fe(VI) with ABTS was very rapid with a half-life time below 0.01 s at pH 4.3 and 73 microM of ABTS. This enables the ABTS method to measure Fe(VI) selectively. The residual absorbance of ABTS*+ was found to be stable in several water matrices (synthetic buffer solution and natural waters) and concentrations of Fe(VI) spiked in natural waters could be determined with high accuracy. The ABTS method can also be used as a tool to determine rate constants of reactions of Fe(VI). The second-order rate constant for the reaction of phenol with Fe(VI) was determined to be 90 M(-1) s(-1) at pH 7.

Authors+Show Affiliations

School of Chemical and Biological Engineering, College of Engineering, Seoul National University, San 56-1, Sillim-dong, Gwanak-gu, Seoul 151-742, Korea.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15876448

Citation

Lee, Yunho, et al. "Spectrophotometric Determination of Ferrate (Fe(VI)) in Water By ABTS." Water Research, vol. 39, no. 10, 2005, pp. 1946-53.
Lee Y, Yoon J, von Gunten U. Spectrophotometric determination of ferrate (Fe(VI)) in water by ABTS. Water Res. 2005;39(10):1946-53.
Lee, Y., Yoon, J., & von Gunten, U. (2005). Spectrophotometric determination of ferrate (Fe(VI)) in water by ABTS. Water Research, 39(10), 1946-53.
Lee Y, Yoon J, von Gunten U. Spectrophotometric Determination of Ferrate (Fe(VI)) in Water By ABTS. Water Res. 2005;39(10):1946-53. PubMed PMID: 15876448.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Spectrophotometric determination of ferrate (Fe(VI)) in water by ABTS. AU - Lee,Yunho, AU - Yoon,Jeyong, AU - von Gunten,Urs, PY - 2004/11/01/received PY - 2005/02/16/revised PY - 2005/5/7/pubmed PY - 2005/10/28/medline PY - 2005/5/7/entrez SP - 1946 EP - 53 JF - Water research JO - Water Res VL - 39 IS - 10 N2 - A new method for the determination of low concentrations (0.03-35 microM) of the aqueous ferrate (Fe(VI)) was developed. The method is based on the reaction of Fe(VI) with 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) which forms a green radical cation (ABTS(+)) that can be measured spectrophotometrically at 415 nm (ABTS method). The reaction of Fe(VI) with ABTS has a stoichiometry of 1 : 1 in excess of ABTS (73 microM). The increase in absorbance at 415 nm for ABTS*+ generation was linear with respect to Fe(VI) added (0.03-35 microM) in buffered solutions (acetate/phosphate buffer at pH = 4.3) and was (3.40+/-0.05) x 10(4) M(-1) cm(-1). The reaction of Fe(VI) with ABTS was very rapid with a half-life time below 0.01 s at pH 4.3 and 73 microM of ABTS. This enables the ABTS method to measure Fe(VI) selectively. The residual absorbance of ABTS*+ was found to be stable in several water matrices (synthetic buffer solution and natural waters) and concentrations of Fe(VI) spiked in natural waters could be determined with high accuracy. The ABTS method can also be used as a tool to determine rate constants of reactions of Fe(VI). The second-order rate constant for the reaction of phenol with Fe(VI) was determined to be 90 M(-1) s(-1) at pH 7. SN - 0043-1354 UR - https://www.unboundmedicine.com/medline/citation/15876448/Spectrophotometric_determination_of_ferrate__Fe_VI___in_water_by_ABTS_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(05)00093-X DB - PRIME DP - Unbound Medicine ER -