Determination of subnanomolar levels of iron(II) and total dissolved iron in seawater by flow injection analysis with chemiluminescence detection

Elrod, V. A., Johnson, K. S., & Coale, K. H. (1991). Determination of subnanomolar levels of iron(II) and total dissolved iron in seawater by flow injection analysis with chemiluminescence detection. Analytical Chemistry, 63(9), 893-898.
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TitleDetermination of subnanomolar levels of iron(II) and total dissolved iron in seawater by flow injection analysis with chemiluminescence detection
AuthorsA. Elrod, S. Johnson, H. Coale
AbstractA highly sensitive technique for the rapid determination of Fe( I I) and total dlssolved iron in seawater has been developed. The technlque employs flow Injection analysis and chemiluminescence detectlon (FIA-CL). The light Is emitted by the reaction of brilliant sulfoflavin with hydrogen peroxlde and Fe( I I ) in a neutral medlum. A cation-exchange column Is used to preconcentrate the Iron from seawater. The detection limit was 0.45 nmol/L when 4.4 mL of sample was passed through the column. Lower detectlon llmlts are attainable wlth larger sample volumes. The relative standard deviation is 2-5% for concentrations greater than 2.5 nmd/L. A typical analysis can be performed In 5 mln. The technique was determlned to be accurate based on the analysis of the trace metal standard seawater solutions NASS and CASS. Shipboard analyses provided oceanographically consistent profiles for total iron and also revealed some of the first profiles for Fe(I1) in hydrothermal plume samples. A typical profile of 12 samples, together with blanks and standards, can be analyzed In triplicate in 4.5 h.
JournalAnalytical Chemistry
Date1991
Volume63
Issue9
Start page893
End page898

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