cadmium isotope fractionation during adsorption onto manganese oxides
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Cadmium Isotope Fractionation During Adsorption onto Manganese Oxides. Gabriela Montañez Mentors: Laura Wasylenki and Ariel Anbar. Nutrient to some marine organisms Toxic metal in environment. Manganese oxide. Why adsorption?.

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cadmium isotope fractionation during adsorption onto manganese oxides

Cadmium Isotope Fractionation During Adsorption onto Manganese Oxides

Gabriela Montañez

Mentors: Laura Wasylenki

and Ariel Anbar

slide2
Nutrient to some marine organisms
  • Toxic metal in environment
why adsorption

Manganese oxide

Why adsorption?
  • Adsorption to particles governs cadmium concentration in natural waters
  • Cadmium is immobilized if strongly adsorbed
  • Will cadmium isotopes fractionate during adsorption?

Cd2+

Cd2+

Cd2+

Cd2+

Cd2+

Cd2+

Cd2+

Cd2+

Cd2+

Cd2+

Cd2+

Cd2+

what are isotopes
What are isotopes?
  • Isotopes are atoms of an element that have the same number of protons but different numbers of neutrons
  • Cadmium has isotopes of mass 106, 108, 110, 111, 112, 114, 116
  • Will light or heavy isotopes preferentially adsorb to manganese oxides?
seawater vs natural ferromanganese crusts
Seawater vs. natural ferromanganese crusts
  • Horner et al. (2008) sampled ferromanganese sediments and seawater at depth
  • No fractionation was found
  • What would a simple controlled laboratory experiment show?
procedure

Cadmium stock

MnOx stock

pH ~ 6

Procedure

Measure isotope ratio on solution and solid after separation

fractionation
Fractionation!

114/108Cd (‰)

implications and future work
Implications and Future Work
  • Fractionation tells us that the isotopes might give us a new tool to track cadmium as it moves between water and sediments in the environment
  • Next steps:
    • try adsorption to other minerals
    • find contaminated aquifer to investigate cadmium isotope variations in the real world
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