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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Raman spectroscopic study of crystallization from solutions containing MgSO_4 and Na_2SO_4: Raman spectra of double salts
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Raman spectroscopic study of crystallization from solutions containing MgSO_4 and Na_2SO_4: Raman spectra of double salts

机译：从包含MgSO_4和Na_2SO_4的溶液中结晶的拉曼光谱研究：双盐的拉曼光谱

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摘要

Mg~(2+), Na~2, and SO_4~(2-) are common ions in natural systems, and they are usually found in water bodies. Precipitation processes have great importance in environmental studies because they may be part of complex natural cycles; natural formation of atmospheric particulate matter is just one case. In this work, Na_2Mg- (SO _4)2. 5H_2O(konyaite), Na6Mg(SO_4)4 (vanthoffite), and Na12Mg7(SO_4)13. 15H_2O (loeweite) were synthesized and their Raman spectra reported. By slow vaporization (at 20 °C and relative humidity of 60-70%), crystallization experiments were performed within small droplets (diameter < 1-2 mm) of solutions containing MgSO _4 and Na_2SO_4, and crystal formations were studied by Raman spectroscopy. Crystallization of Na_2Mg(SO _4)2. 04H_2O (bloedite) was observed, and the formation of salt mixtures was confirmed by Raman spectra. Bloedite, konyaite, and loeweite, as well as Na_2SO_4 and MgSO_4. 6H_2O, were the components found to occur in different proportions. No crystallization of Na_6Mg(SO_4)4 (vanthoffite) was observed under the crystallization condition used in this study.
机译：Mg〜（2 +），Na〜2和SO_4〜（2-）是自然系统中的常见离子，通常存在于水体中。降水过程在环境研究中非常重要，因为它们可能是复杂的自然循环的一部分。大气颗粒物的自然形成只是一种情况。在这项工作中，Na_2Mg-（SO _4）2。 5H_2O（konyaite），Na6Mg（SO_4）4（vanthoffite）和Na12Mg7（SO_4）13。合成了15H_2O（硅藻土）并报告了其拉曼光谱。通过缓慢蒸发（在20°C和60-70％的相对湿度下），在包含MgSO 4和Na_2SO_4的小液滴（直径<1-2 mm）中进行结晶实验，并通过拉曼光谱研究晶体的形成。 Na_2Mg（SO_4）2的结晶。观察到04H_2O（水铁矿），并且通过拉曼光谱确认了盐混合物的形成。 Bloedite，konyaite和loeweite以及Na_2SO_4和MgSO_4。发现6H_2O的组分以不同的比例出现。在本研究中使用的结晶条件下，未观察到Na_6Mg（SO_4）4（钒钛矿）的结晶。

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