Sukekava, Camila Fiaux; Andrade, Carlos Francisco Ferreira de; Wallner-Kersanach, Mônica; Carvalho, Iarema; Contreira, Leonardo; Lima, Kayla; Paiva, Mariele; Costa, Daniel; Souza, Gabriel Karagiannis; Niencheski, Luis Felipe Hax; Laglera, Luis Miguel (2023): Macronutrients and iron speciation on southern Brazilian continental shelf in summer 2015 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.951154
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Published: 2023-01-04 • DOI registered: 2023-02-02
Abstract:
In summer 2015, The RV Atlântico Sul cruise collected water column samples for macronutrients, dissolved iron (DFe) concentrations and speciation and humic substances (HS) in a transect over the shelf of the South Brazil Bight (SBB) at Santa Marta Grande Cape (28.5°S, SE Brazil) during coastal downwelling episode.
Samples were collected over the whole shelf and the initial section of the slope. All samples were collected using 12-liter Teflon-coated Go-Flo bottles suspended on a Kevlar line. Samples were divided into nutrients and trace metals onboard. Samples for nutrients were filtered through 0.45 µm filters (cellulose acetate, Millipore), and samples for dissolved DFe, organic iron speciation and HS were immediately filtered by 0.2 µm (cellulose nitrate ,Millipore). All samples were immediately frozen for analysis.
In laboratory, samples were thawed and analyzed for nutrients the analytical methodology used was described in Strickland and Parsons, (1972). DFe concentrations, the samples were determined following a well-established CSV method (Laglera et al., 2013) adding a UV digestion step. Organic iron speciation was analyzed using a modified method described initially by (van den Berg, 2006), but modified removing the addition of bromate from the original method to avoid any underestimation of the contribution of HS to ligand concentrations (Laglera et al., 2011). The determination of HS concentrations and iron-humic complex concentrations following stablished CSV procedures (Laglera et al., 2007; Sukekava et al., 2018).
Using those samples, the aim of this research was comprehending the effect of coastal downwelling such episodes in the distributions of macronutrients, DFe and humic substances in SBB.
Supplement to:
Sukekava, Camila Fiaux; Andrade, Carlos Francisco Ferreira de; Niencheski, Luis Felipe Hax; de Souza, Márcio Silva; Laglera, Luis Miguel (2023): Macronutrients, iron and humic substances summer cycling over the extended continental shelf of the South Brazil Bight. Science of the Total Environment, 865, 161182, https://doi.org/10.1016/j.scitotenv.2022.161182
Further details:
Caprara, Salvatore; Laglera, Luis Miguel; Monticelli, Damiano (2015): Ultrasensitive and Fast Voltammetric Determination of Iron in Seawater by Atmospheric Oxygen Catalysis in 500 μL Samples. Analytical Chemistry, 87(12), 6357-6363, https://doi.org/10.1021/acs.analchem.5b01239
Laglera, Luis Miguel; Battaglia, Gianluca; van den Berg, Constant M G (2011): Effect of humic substances on the iron speciation in natural waters by CLE/CSV. Marine Chemistry, 127(1-4), 134-143, https://doi.org/10.1016/j.marchem.2011.09.003
Laglera, Luis Miguel; Battaglia, Gianluca; Van den Berg, Johnnie; van den Berg, Constant M G (2007): Determination of humic substances in natural waters by cathodic stripping voltammetry of their complexes with iron. Analytica Chimica Acta, 599(1), 58-66, https://doi.org/10.1016/j.aca.2007.07.059
Laglera, Luis Miguel; Santos-Echeandía, Juan; Caprara, Salvatore; Monticelli, Damiano (2013): Quantification of Iron in Seawater at the Low Picomolar Range Based on Optimization of Bromate/Ammonia/Dihydroxynaphtalene System by Catalytic Adsorptive Cathodic Stripping Voltammetry. Analytical Chemistry, 85(4), 2486-2492, https://doi.org/10.1021/ac303621q
Strickland, John D H; Parsons, T R (1972): A practical handbook of seawater analysis. Fisheries Research Board of Canada, hdl:10013/epic.46454.d001
Sukekava, Camila Fiaux; Downes, Javier; Slagter, Hans A; Gerringa, Loes J A; Laglera, Luis Miguel (2018): Determination of the contribution of humic substances to iron complexation in seawater by catalytic cathodic stripping voltammetry. Talanta, 189, 359-364, https://doi.org/10.1016/j.talanta.2018.07.021
van den Berg, Constant M G (2006): Chemical Speciation of Iron in Seawater by Cathodic Stripping Voltammetry with Dihydroxynaphthalene. Analytical Chemistry, 78(1), 156-163, https://doi.org/10.1021/ac051441%2B
Coverage:
Median Latitude: -28.901409 * Median Longitude: -47.837136 * South-bound Latitude: -29.098000 * West-bound Longitude: -48.800000 * North-bound Latitude: -28.593000 * East-bound Longitude: -47.240000
Date/Time Start: 2015-01-19T11:00:00 * Date/Time End: 2015-01-20T16:00:00
Minimum DEPTH, water: 1.0 m * Maximum DEPTH, water: 1500.0 m
Event(s):
INCT_Jan2015_SM_01 * Latitude: -28.593000 * Longitude: -48.800000 * Date/Time: 2015-01-19T00:00:00 * Campaign: INCT-COI_2015 (INCT-COI 2015) * Basis: Atlantico Sul * Method/Device: Water sample (WS)
INCT_Jan2015_SM_02 * Latitude: -28.612000 * Longitude: -48.740000 * Date/Time: 2015-01-19T00:00:00 * Campaign: INCT-COI_2015 (INCT-COI 2015) * Basis: Atlantico Sul * Method/Device: Water sample (WS)
INCT_Jan2015_SM_03 * Latitude: -28.726000 * Longitude: -48.382000 * Date/Time: 2015-01-19T00:00:00 * Campaign: INCT-COI_2015 (INCT-COI 2015) * Basis: Atlantico Sul * Method/Device: Water sample (WS)
Comment:
Project: 'INCT - Mar Centro de Oceanografia Integrada (INCT Mar-COI)', https://inct.furg.br
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Sukekava, Camila Fiaux | |||
| 2 | Station label | Station | Sukekava, Camila Fiaux | Station | ||
| 3 | Station label | Station | Sukekava, Camila Fiaux | Station number | ||
| 4 | Station label | Station | Sukekava, Camila Fiaux | Station name | ||
| 5 | LATITUDE | Latitude | Sukekava, Camila Fiaux | Geocode | ||
| 6 | LONGITUDE | Longitude | Sukekava, Camila Fiaux | Geocode | ||
| 7 | Depth, bottom/max | Depth bot | m | Sukekava, Camila Fiaux | Bottom of the station | |
| 8 | DEPTH, water | Depth water | m | Sukekava, Camila Fiaux | Geocode – Sampling depth | |
| 9 | DATE/TIME | Date/Time | Sukekava, Camila Fiaux | Geocode – Sampling time; UTC | ||
| 10 | Date/Time local | Date/Time local | Sukekava, Camila Fiaux | Sampling time; Brasília Time (i.e. UTC-03:00) | ||
| 11 | Wind direction | dd | deg | Sukekava, Camila Fiaux | ||
| 12 | Wind speed | ff | m/s | Sukekava, Camila Fiaux | ||
| 13 | Temperature, water | Temp | °C | Sukekava, Camila Fiaux | ITS-90 | |
| 14 | Conductivity | Cond | mS/cm | Sukekava, Camila Fiaux | ||
| 15 | Salinity | Sal | Sukekava, Camila Fiaux | PSU | ||
| 16 | pH | pH | Sukekava, Camila Fiaux | |||
| 17 | Oxygen | O2 | mg/l | Sukekava, Camila Fiaux | ||
| 18 | Oxygen saturation | O2 sat | % | Sukekava, Camila Fiaux | ||
| 19 | Turbidity (Nephelometric turbidity unit) | Turbidity | NTU | Sukekava, Camila Fiaux | ||
| 20 | Ammonium | [NH4]+ | µmol/l | Sukekava, Camila Fiaux | ||
| 21 | Nitrite | [NO2]- | µmol/l | Sukekava, Camila Fiaux | ||
| 22 | Nitrate | [NO3]- | µmol/l | Sukekava, Camila Fiaux | ||
| 23 | Phosphate | [PO4]3- | µmol/l | Sukekava, Camila Fiaux | ||
| 24 | Silicate | Si(OH)4 | µmol/l | Sukekava, Camila Fiaux | ||
| 25 | Iron, dissolved | Fe diss | nmol/l | Sukekava, Camila Fiaux | Cathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after Laglera et al. (2013) | |
| 26 | Iron, dissolved, standard deviation | Fe diss std dev | ± | Sukekava, Camila Fiaux | Cathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after Laglera et al. (2013) | |
| 27 | Ligand concentration | Ligands | nmol/l | Sukekava, Camila Fiaux | Cathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after van den Berg (2006, doi:10.1021/ac051441+) and without purge as Caprara et al. (2015, doi:10.1021/acs.analchem.5b01239) | |
| 28 | Ligand concentration, standard deviation | Ligands std dev | ± | Sukekava, Camila Fiaux | Cathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after van den Berg (2006, doi:10.1021/ac051441+) and without purge as Caprara et al. (2015, doi:10.1021/acs.analchem.5b01239) | |
| 29 | Iron, inorganic, conditional stability constants | Log K Fe'L | Sukekava, Camila Fiaux | Cathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after van den Berg (2006, doi:10.1021/ac051441+) and without purge as Caprara et al. (2015, doi:10.1021/acs.analchem.5b01239) | Constant of equilibrium of iron organic speciation. | |
| 30 | Iron, inorganic, conditional stability constants, standard deviation | Log K Fe'L std dev | ± | Sukekava, Camila Fiaux | Cathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after van den Berg (2006, doi:10.1021/ac051441+) and without purge as Caprara et al. (2015, doi:10.1021/acs.analchem.5b01239) | |
| 31 | Side coefficient of dissolved Fe-complex ligands | Log alpha Fe3+Li | Sukekava, Camila Fiaux | Cathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after van den Berg (2006, doi:10.1021/ac051441+) and without purge as Caprara et al. (2015, doi:10.1021/acs.analchem.5b01239) | Logarithm of side reaction coefficient, which is the concentration ratio of complexed iron to the free iron. | |
| 32 | Humic substances | Humics | mg/l | Sukekava, Camila Fiaux | Cathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after Sukekava et al. (2018) | Related to Suwannee River Fulvic Acid (SRFA) |
| 33 | Percentage | Perc | % | Sukekava, Camila Fiaux | Cathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after Sukekava et al. (2018) | Percentage of humic substances that are considered ligand. |
| 34 | Iron | Fe | nmol/l | Sukekava, Camila Fiaux | Cathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after Sukekava et al. (2018) | Iron complexed by humic substances |
| 35 | Percentage | Perc | % | Sukekava, Camila Fiaux | Cathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after Sukekava et al. (2018) | Percentage of dissolved iron that form iron-humic substances complex |
| 36 | Density, sigma-theta (0) | Sigma-theta | kg/m3 | Sukekava, Camila Fiaux | ||
| 37 | Ratio | Ratio | Sukekava, Camila Fiaux | C/N; Ratio isotope δ13C and δ15N in particulate matter | ||
| 38 | Carbon, organic, particulate | POC | % | Sukekava, Camila Fiaux | Percentage of organic particulate carbon in the particulate matter | |
| 39 | Carbon, organic, particulate | POC | µg/l | Sukekava, Camila Fiaux | ||
| 40 | Ratio | Ratio | Sukekava, Camila Fiaux | Ratio ligand and iron complexed by humic substances | ||
| 41 | Ratio | Ratio | Sukekava, Camila Fiaux | Ratio nitrate and phosphate |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
771 data points