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Methodology For PH And Oxygen Measurement In The Lena River Plume, Laptev Sea.pdf

bg-16-1305-2019-supplement.pdf
Preview of Methodology for pH and Oxygen Measurement in the Lena River Plume, Laptev Sea
🔗 Source: bg.copernicus.org
📊 Size: 251 KB
📄 Pages: 4 pages
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Summary

This supplement details the distribution of iron (Fe) isotopes in particles and colloids within the salinity gradient along the Lena River plume in the Laptev Sea. The study analyzed water samples from various stations, focusing on pH, oxygen content, and Fe isotope ratios (δ56/54Fe, δ57/54Fe, δ57/56Fe).

Key Findings:

Mass-dependent fractionation: The correlation between δ56/54Fe and δ57/54Fe in all analyzed samples confirms mass-dependent fractionation between Fe isotopes.
Particulate and colloidal fractions: Significant differences were observed in Fe isotope ratios between particulate (>0.22 µm), colloidal (1kDa-0.22 µm), and surface sediment fractions. Particulate and colloidal phases generally exhibited lighter isotope ratios than sediments, suggesting diagenetic processes or mixing.
Fe loss: Calculations indicate substantial loss of particulate Fe along the plume, with YS-14 showing minimal loss, while other stations exhibit varying degrees of Fe depletion.
 Elemental concentrations: The study also provides data on elemental concentrations (Al, Ti, Fe) in the particulate phase and their ratios, comparing them to upper continental crust values.

Methodology:

The research utilized spectrophotometric and Winkler titration methods for pH and oxygen measurements, respectively. Fe isotope analyses were performed using a mass spectrometer.

Significance:

These findings contribute to our understanding of iron cycling in river plumes, highlighting the importance of fractionation processes and sediment interactions on Fe isotope ratios. The data can inform models of nutrient availability and biogeochemical cycles in coastal environments.

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  • File Format: PDF
  • File Size: 251 KB
  • Pages: 4
  • Language: EN
  • Total Downloads: 36
  • Last Updated: 1 week ago

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Methodology guideMethodology tutorialOxygen guideOxygen tutorialMeasurement guideMeasurement tutorialLena guideLena tutorialRiver guideRiver tutorialPlume, guidePlume, tutorialLaptev guideLaptev tutorial

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