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

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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


Cadmium isotope fractionation during adsorption onto manganese oxides

  • 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


Mass spectrometer

Mass Spectrometer

108

114


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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