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Simultaneous spectrophotometric measurement of iron(II) and iron(III) in atmospheric water

Pehkonen, Simo O. and Erel, Yigal and Hoffmann, Michael R. (1992) Simultaneous spectrophotometric measurement of iron(II) and iron(III) in atmospheric water. Environmental Science and Technology, 26 (9). pp. 1731-1736. ISSN 0013-936X. https://resolver.caltech.edu/CaltechAUTHORS:20150811-111820669

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Abstract

A new analytical method employing di-pyridyl ketone benzoylhydrazone (DPKBH) as a colorimetric chelating agent for the simultaneous determination of iron(II) and iron (III) in cloudwater has been developed. A spectrophotometric detection limit of 4 nM for both Fe(III) and Fe(II) with a linear response from 4 nM to 0.1 µM was established for samples extracted with CHCl_3-H_2O. DPKBH chelation without CHCl_3 extraction showed a linear response from 0.1 to 30 µM. The molar extinction coefficients of the Fe(II)-bis(DPKBH) (є_2) and Fe(III)-bis(DPKBH) (є_1) complexes are є_l and є_2 = 3.6 X 10^4 L mol^(-1) cm^(-1) at 370 nm and є_2 = 1.1 X 10^4 L mol^(-1) cm^(-1) at 660 nm. Analytical interference studies on the possible changes in the oxidation state of iron with S(IV), oxalate, and other potential electron donors have also been carried out. This analytical method has been used to determine iron(II) and iron(III) simultaneously in cloudwater samples collected within the Los Angeles basin airshed. The concentration of Fe(II) varied from 0.3 to 5 µM, and the concentration of Fe(III) varied from 0.6 to 1.4 µM during several stratus cloud events.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/es00033a003DOIArticle
http://pubs.acs.org/doi/abs/10.1021/es00033a003PublisherArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 1992 American Chemical Society. Received for review December 16, 1991. Revised manuscript received April 30,1992. Accepted May 5,1992. This work was supported by Grant ATM-9015775 from the National Science Foundation, Division of Atmospheric Sciences, Atmospheric Chemistry Section.
Funders:
Funding AgencyGrant Number
NSFATM-9015775
Issue or Number:9
Record Number:CaltechAUTHORS:20150811-111820669
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150811-111820669
Official Citation:Simultaneous spectrophotometric measurement of iron(II) and iron(III) in atmospheric water Simo O. Pehkonen, Yigal Erel, and Michael R. Hoffmann Environmental Science & Technology 1992 26 (9), 1731-1736 DOI: 10.1021/es00033a003
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59405
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:12 Aug 2015 16:05
Last Modified:03 Mar 2020 13:01

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