FN Archimer Export Format
PT J
TI Impact of environmental factors on in situ determination of iron in seawater by flow injection analysis
BT 
AF LAES, Agathe
   VUILLEMIN, Renaud
   LEILDE, Bernard
   SARTHOU, Géraldine
   BOURNOT MAREC, Claudie
   BLAIN, Stéphane
AS 1:1,2;2:2;3:2;4:1;5:3;6:4;
FF 1:PDG-DOP-DCB-TSI-ME;2:PDG-DOP-DCB-TSI-ME;3:PDG-DOP-DCB-TSI-DM;4:;5:;6:;
C1 Inst Univ Europeen Mer, LEMAR, UMR 6539, CNRS, F-29280 Plouzane, France.
   IFREMER, Ctr Brest, TMSI, TSI, F-29280 Plouzane, France.
   INSU, CNRS, IFRTP, F-29280 Plouzane, France.
   CNRS, Ctr Oceanol Marseille, LOB, UMR 6535, F-13288 Marseille, France.
C2 IUEM, FRANCE
   IFREMER, FRANCE
   INSU, FRANCE
   CNRS, FRANCE
SI BREST
SE PDG-DOP-DCB-TSI-ME
   PDG-DOP-DCB-TSI-DM
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.103
TC 22
UR https://archimer.ifremer.fr/doc/2005/publication-1209.pdf
LA English
DT Article
DE ;Temperature and pressure effects;Submersible chemical analyser;Seawater;In situ measurements;Iron;Flow injection analysis
AB A sensitive method for iron determination in seawater has been adapted on a submersible chemical analyser for in situ measurements. The technique is based on flow injection analysis (FIA) coupled with spectrophotometric detection. When direct injection of seawater was used, the detection limit was 1.6 nM, and the precision 7%, for a triplicate injection of a 4 nM standard. At low iron concentrations, on line preconcentration using a column filled with 8-hydroxyquinoline (8HQ) resin was used. The detection limit was 0.15 nM (time of preconcentration = 240 s), and the precision 6%, for a triplicate determination of a I nM standard, allowing the determination of Fe in most of the oceanic regimes, except the most depleted surface waters. The effect of temperature, pressure, salinity, copper, manganese, and iron speciation on the response of the analyser was investigated. The slope of the calibration curves followed a linear relation as a function of pressure (C-p = 2.8 x 10(-5)P + 3.4 x 10(-2) s nmol(-1), R-2 = 0.997, for Theta = 13 degrees C) and an exponential relation as a function of temperature (C-Theta = 0.009e(0.1030), R-2 = 0.832, for P = 3 bar). No statistical difference at 95% confidence level was observed for samples of different salinities (S = 0, 20, 35). Only very high concentration of copper (1000 x [Fe]) produced a detectable interference. The chemical analyser was deployed in the coastal environment of the Bay of Brest to investigate the effect of iron speciation on the response of the analyser. Direct injection was used and seawater samples were acidified on line for 80 s. Dissolved iron (DFe, filtered seawater (0.4 mu m), acidified and stored at pH 1.8) corresponded to 29 +/- 4% of Fe-a (unfiltered seawater, acidified in line at pH 1.8 for 80 s). Most of Fea (71 4%) was probably a fraction of total dissolvable iron (TDFe, unfiltered seawater, acidified and stored at pH 1.8). 
PY 2005
PD DEC
SO Marine Chemistry
SN 0304-4203
PU Elsevier
VL 97
IS 3-4
UT 000233500200013
BP 347
EP 356
DI 10.1016/j.marchem.2005.06.002
ID 1209
ER

EF