Title

Cross-Calibration of Long Pathlength Absorbance vs. Chemiluminescence Flow Injection for Analysis of Trace Fe(II) Concentrations in Aqueous Media

Presenter Information

Daniel Hinz
Hsiang Teng
Hoi Ting

Document Type

Oral Presentation

Location

SURC Ballroom A

Start Date

17-5-2012

End Date

17-5-2012

Abstract

My research is part of a larger project intended to understand the mechanism of iron redox chemistry in aerosol particles that supply phytoplankton in the open ocean with the limiting micronutrient iron, we developed the parallel use of two analytical instruments that combined allow us to detect ferrous iron from 50pM to 300 nM. Analysis of crustal iron aerosol samples from the South Atlantic Ocean in 2005 and the equatorial Pacific Ocean in 2006 are being analyzed for iron content via flow injection analysis (FIA) and liquid waveguide capillary cell (LWCC) instruments. The FIA operates by the interaction of iron (II) with luminol to produce chemiluminescense. LWCC operates by measuring the absorbance of iron (II)-ferrozine complex. Cross calibration has been carried out initially by analyzing synthetic samples and subsequently actual atmospheric samples to test the effect of sample matrix on the signal. Samples from equatorial Pacific Ocean between Hawaii and Papua New Guinea during a 2-month research cruise (R/V Kilo Moana) in Aug-Oct 2006 were analyzed using the FIA and LWCC.

Poster Number

28

Faculty Mentor(s)

Anne Johansen

Additional Mentoring Department

Chemistry

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May 17th, 8:30 AM May 17th, 11:00 AM

Cross-Calibration of Long Pathlength Absorbance vs. Chemiluminescence Flow Injection for Analysis of Trace Fe(II) Concentrations in Aqueous Media

SURC Ballroom A

My research is part of a larger project intended to understand the mechanism of iron redox chemistry in aerosol particles that supply phytoplankton in the open ocean with the limiting micronutrient iron, we developed the parallel use of two analytical instruments that combined allow us to detect ferrous iron from 50pM to 300 nM. Analysis of crustal iron aerosol samples from the South Atlantic Ocean in 2005 and the equatorial Pacific Ocean in 2006 are being analyzed for iron content via flow injection analysis (FIA) and liquid waveguide capillary cell (LWCC) instruments. The FIA operates by the interaction of iron (II) with luminol to produce chemiluminescense. LWCC operates by measuring the absorbance of iron (II)-ferrozine complex. Cross calibration has been carried out initially by analyzing synthetic samples and subsequently actual atmospheric samples to test the effect of sample matrix on the signal. Samples from equatorial Pacific Ocean between Hawaii and Papua New Guinea during a 2-month research cruise (R/V Kilo Moana) in Aug-Oct 2006 were analyzed using the FIA and LWCC.