Nuclear magnetic resonance study of sea-water freezing mechanisms: 2. Temperature dependence of relaxation time of protons in sea-ice brine
Abstract:Results of determinations of proton magnetic relaxation time (T 1) in the liquid phase of frozen sea water at temperatures between –2°C and –38°C, with variable rate and direction of temperature change, are presented. Temperature hysteresis corresponding to the crystallization range of certain sea-water salts, mainly NaCl which partially precipitates as the crystalline hydrate NaCl·2H2O at temperatures below –23°C, is detected in the temperature dependence of T 1, as in the analogous dependence of brine content. It is shown that formation of crystalline hydrates in brine is preceded by complete solvation of ions at –5 to –6°C. The main causes of hysteresis in temperature dependence of T 1 and the extension of loop limits compared with the analogous loop for liquid brine content are indicated. Additional potentialities of using the nuclear magnetic resonance method for investigating sea-ice properties are presented.
Document Type: Research Article
Publication date: August 1, 2013
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