Dataset: Dissolved Fe(II) from the southbound leg of the US GEOTRACES Arctic cruise (HLY1502) on USCGC Healy from August to October 2015

ValidatedFinal no updates expectedDOI: 10.26008/1912/bco-dmo.811614.2Version 2 (2020-09-23)Dataset Type:Cruise Results

Principal Investigator: Phoebe J. Lam (University of California-Santa Cruz)

Contact: Maija I. Heller (University of California-Santa Cruz)

BCO-DMO Data Manager: Shannon Rauch (Woods Hole Oceanographic Institution)

Program: U.S. GEOTRACES (U.S. GEOTRACES)

Project: U.S. Arctic GEOTRACES Study (GN01) (U.S. GEOTRACES Arctic)

Abstract

Dissolved Fe(II) concentrations were determined using an automated flow injection analysis system (FeLume II Waterville Analytical) employing a luminol chemiluminescence based detection system as described in King et al. (1995) and Heller et al. (2017). From published and ongoing work in the Peru and Chile oxygen minimum zones an optimized methodology for Fe(II) detection by luminol has been described in Croot et al. (2019). This work details some of the challenges and limitations of using lu...

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Dissolved Fe(II) concentrations were determined using an automated flow injection analysis system (FeLume II Waterville Analytical) employing a luminol chemiluminescence based detection system as described in King et al. (1995) and Heller et al. (2017).

From published and ongoing work in the Peru and Chile oxygen minimum zones an optimized methodology for Fe(II) detection by luminol has been described in Croot et al. (2019). This work details some of the challenges and limitations of using luminol for dFe(II) detection. It should be noted that as Fe(II) is a transient redox species with a short half life in oxygenated seawater that is dependent on dissolved oxygen and pH, it is not possible to archive (preserve) samples for later analysis. Intercalibrations for Fe(II) have yet to be conducted in the context of GEOTRACES studies and should be pursued where logistically possible.  

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Related Publications

Methods
Croot, P. L., & Laan, P. (2002). Continuous shipboard determination of Fe(II) in polar waters using flow injection analysis with chemiluminescence detection. Analytica Chimica Acta, 466(2), 261–273. doi:10.1016/s0003-2670(02)00596-2
Methods
Croot, P. L., Heller, M. I., & Wuttig, K. (2019). Redox Processes Impacting the Flux of Iron(II) from Shelf Sediments to the OMZ along the Peruvian Shelf. ACS Earth and Space Chemistry, 3(4), 537–549. doi:10.1021/acsearthspacechem.8b00203
Methods
Heller, M. I., Lam, P. J., Moffett, J. W., Till, C. P., Lee, J.-M., Toner, B. M., & Marcus, M. A. (2017). Accumulation of Fe oxyhydroxides in the Peruvian oxygen deficient zone implies non-oxygen dependent Fe oxidation. Geochimica et Cosmochimica Acta, 211, 174–193. doi:10.1016/j.gca.2017.05.019
Methods
Hopkinson, B. M., & Barbeau, K. A. (2007). Organic and redox speciation of iron in the eastern tropical North Pacific suboxic zone. Marine Chemistry, 106(1-2), 2–17. doi:10.1016/j.marchem.2006.02.008
Methods
King, D. W., Lounsbury, H. A., & Millero, F. J. (1995). Rates and Mechanism of Fe(II) Oxidation at Nanomolar Total Iron Concentrations. Environmental Science & Technology, 29(3), 818–824. doi:10.1021/es00003a033

Heller, M. I. (2020) Dissolved Fe(II) from the southbound leg of the US GEOTRACES Arctic cruise (HLY1502) on USCGC Healy from August to October 2015. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 2) Version Date 2020-09-23 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.811614.2 [access date]

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