Chemical Morphology of Frozen Mixed Nitrate-Salt Solutions.

Title Chemical Morphology of Frozen Mixed Nitrate-Salt Solutions.
Authors K.J. Morenz; J. Donaldson
Journal J Phys Chem A
DOI 10.1021/acs.jpca.6b12608

Surface chemistry on ice can play an important role in atmospheric composition, but uncertainties in the chemical partitioning within ice samples has hindered the development of accurate models of these systems. Using Raman microscopy, we examine the nitrate distribution in ice and liquid samples containing environmentally relevant concentrations of sodium chloride, sodium bromide, and sea salt analogue Instant Ocean. Nitrate is enhanced at the surface compared to in the bulk in all frozen samples but to different degrees depending on the added salt. A large variation of nitrate in the horizontal dimension of frozen samples provides direct evidence that it congregates in pockets or grain boundaries within the crystal. In these pockets, nitrate experiences a solution-like environment, whereas at the surface nitrate sometimes forms solid crystals.

Citation K.J. Morenz; J. Donaldson.Chemical Morphology of Frozen Mixed Nitrate-Salt Solutions.. J Phys Chem A. 2017;121(10):21662171. doi:10.1021/acs.jpca.6b12608

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See more Nitrogen products. Nitrogen is a Block P, Group 15, Period 2 element. Its electron configuration is [He]2s22p3. Nitrogen is an odorless, tasteless, colorless and mostly inert gas. It is the seventh most abundant element in the universe and it constitutes 78.09% (by volume) of Earth's atmosphere. Nitrogen was discovered by Daniel Rutherford in 1772.

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