首页> 外文期刊>Journal of Glaciology >Nuclear magnetic resonance study of sea-water freezing mechanisms: 2. temperature dependence of relaxation time of protons in sea-ice brine
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Nuclear magnetic resonance study of sea-water freezing mechanisms: 2. temperature dependence of relaxation time of protons in sea-ice brine

机译:海水冻结机制的核磁共振研究:2.海冰盐水中质子弛豫时间的温度依赖性

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摘要

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·2H_2O 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.
机译:给出了在-2℃至-38℃之间的温度变化的速度和方向变化的情况下,冷冻海水液相中质子磁弛豫时间(T _1)的测定结果。与T_1的温度相关性(如与盐​​水的类似性相关)可检测到与某些海水盐的结晶范围相对应的温度滞后,主要是NaCl,它在低于-23°C的温度下以结晶水合物NaCl·2H_2O的形式部分沉淀。内容。结果表明,在盐水中形成结晶水合物之前,在-5至-6°C的温度下离子被完全溶剂化。指出了T_1温度依赖性滞后的主要原因以及与液态盐水含量的类似回路相比回路极限的扩展。提出了使用核磁共振方法研究海冰特性的其他潜力。

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