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Imagine the following hypothetical scenario you are facing as a scientist: There is a chance that a mining waste containing arsenic (in the form of arsenate) leaked out and is contaminating the soil around the mining site. This soil is rich in iron (predominantly in the form of the mineral goethite). Using any vibrational spectroscopic (FT-IR spectroscopy, FT-IR microspectroscopy, Raman spectroscopy, Raman microspectroscopy) technique, combined with pH measurements, you should investigate whether the soil absorbs the arsenate on its surface or not (or extrapolating the other way around: whether arsenate can reach the ground water and get into the water supplies, or not as it is bound to the mineral). Describe how you would attempt to solve this problem: What experiments would you use? What vibrational spectroscopic technique (or techniques) would you use and what kind of results would you expect from them? What are the limitations? What other experimental techniques would you use to complement your vibrational spectroscopic study and why? |
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