DISTRIBUCIÓN EN ESPACIO Y TIEMPO DE LOS ISÓTOPOS DE HIERRO EN EL MATERIAL EN SUSPENSIÓN DEL RÍO AMAZONAS Y SUS PRINCIPALES AFLUENTES
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1 DISTRIBUCIÓN EN ESPACIO Y TIEMPO DE LOS ISÓTOPOS DE HIERRO EN EL MATERIAL EN SUSPENSIÓN DEL RÍO AMAZONAS Y SUS PRINCIPALES AFLUENTES DISTRIBUTION IN SPACE AND TIME OF IRON ISOTOPES IN PARTICULATE MATTER FROM THE AMAZON RIVER AND ITS MAIN TRIBUTARIES RÉPARTITION DANS L ESPACE ET LE TEMPS DES ISOTOPES DE FER DANS LA FRACTION PARTICULAIRE DU FLEUVE AMAZONE ET SES PRINCIPAUX AFFUENTS Giana Márcia dos Santos Pinheiro; Franck Poitrasson; Francis Sondag; Lucieth Cruz Vieira; Jean-Michel Martinez; Márcio Martins Pimentel
2 OBJECTIVES Study potential variations of iron isotopes in the Amazon River and its tributaries, relative to various parameters, such as: different locations; different climates / periods of hydrological cycle; different levels of water column (depth profiles); different types of water (white, black, clear). Compare results to river systems located in different areas of the world, both boreal and intertropical
3 54 Fe: 5.80% 56 Fe: 91.72% 57 Fe: 2.20% 58 Fe: 0.28% IRON
4 IRON ISOTOPES Sensitive to redox states Tracers of different sources Rivers (tributaries, soils, vegetation) Oceans (from rivers, aerosols, fluids of sediments pores)
5 SAMPLING & METHODS
6 SAMPLING
7 Three field campaigns: Napo, Ucayali, Marañon (Peru) Negro, Solimões, Amazonas, Madeira, Tapajós (Brasil) October and November 2009; July 2010 Samples filtered in field with 0.45 µm membranes (celulose acetate) Dissolution of membranes for recovery of suspended matter (SM) HNO3, H2O2, HF & HCl 6N
8 IRON IN SUSPENDED MATTER (SM) purified by anion chromatography analysed by MC-ICP-MS (Geocronology Laboratory University of Brasília & GET, Toulouse) Ni-doping technique applied to correct for mass bias during MC-ICP-MS measurements (Poitrasson and Freydier, 2005) Milhas hematite standard - δ 57 Fe value of 0.757±0.067 (2SD), relative to the IRMM-14 isotopic standard good agreement with previous published data (0.746±0.062, Poitrasson & Freydier, 2005) - good stability AND accuracy of the equipment Photo: Daniel Santos Multicollector Inductively Coupled Plasma Mass Spectrometer (MC-ICP-MS) Geocronology Laboratory University of Brasília
9 RESULTS
10 Studied Sites:
11 Depth Profile - ÓBIDOS
12 MC-ICPMS Fe - behavior in suspended matter ICP-AOS Mn - behavior in suspended matter
13 Fe/Mn ratios behavior in suspended matter
14 Similar pattern for Santarém Station! Total Particular Carbon & Organic Particular Carbon
15 DEPTH PROFILE ÓBIDOS suspended matter Surface samples represent the whole section
16 DEPTH PROFILE MANICORÉ - suspended matter Surface samples represent the whole section
17 DEPTH PROFILE NEGRO - suspended matter Black waters more humic, acid ph organic matter signature upper soil horizons, rich in organic matter similar isotopic signatures
18 Temporal Series ÓBIDOS
19 ICP-AES Fe, Mg, Al - behavior in suspended matter Mn behavior in suspended matter
20 Temporal Series Óbidos Suspended Matter Iron Concentration (MC-ICPMS)
21 Flux of elements - Mn Tons per day Flux of elements - Fe, Mg, Al Tons per day
22 Temporal Series Óbidos Iron Isotopes Suspended Matter
23 DISCUSSION
24 Data from: Bergquist & Boyle, 2006; Ingri et al., 2006; Escoube et al., 2009; Song et al., 2011
25 BOREAL X INTERTROPICAL RIVERS
26 Iron Isotopes Amazon River at Óbidos
27 Iron Isotopes Kalix River (Sweeden) & Amazon River Contrasting behaviour between equatorial and boreal
28 CONCLUDING REMARKS Surface samples seem representative of the whole river section Results obtained for depth profiles (Madeira & Amazonas) and for the temporal series (Amazonas) are similar the continental crust s δ 57 Fe (~0.1, Poitrasson, 2006) Negro River only station with distinct δ 57 Fe values (but Bergquist & Boyle (2006) : 1 discrepancy! Contrasting with boreal rivers, where δ 57 Fe values in suspended load varies by up to ~0.6 along the year (Ingri et al., 2006) Very little Fe isotope fractionation during Fe transfer from soils to rivers in intertropical zones (see also: Poitrasson et al., 2008)
29 ACKNOWLEDGMENTS
30 GRACIAS! Thank you! Obrigada! Merci!
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