Solubility of the Sodium and Ammonium Salts of Oxalic Acid in Water with Ammonium Sulfate
Solubility of the Sodium and Ammonium Salts of Oxalic Acid in Water with Ammonium Sulfate
复制标题
硫酸铵测定草酸的钠盐和铵盐在水中的溶解度
DOI：
10.1021/acs.jpca.6b05208
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Beyer, Keith D.
中科院分区：
文献类型：
--
作者：
Buttke, Lukas G.;Schueller, Justin R.;Pearson, Christian S.;Beyer, Keith D.
用差示扫描量热法、X射线结晶学和红外光谱研究了草酸的钠盐和铵盐在有硫酸铵存在的水中的溶解度。在低硫酸铵条件下，草酸氢氢钠水溶液中形成的晶体为一水草酸氢氢钠晶体；在高硫酸铵条件下，草酸氢氢钠水溶液中形成的晶体为半水草酸氢铵晶体。结果表明，在中高浓度的硫酸铵溶液中，草酸铵的结晶为一水草酸铵，在低浓度的硫酸铵溶液中，草酸钠的结晶为草酸钠。研究还发现，硫酸铵提高了草酸根盐的溶解度(盐析效应)，降低了草酸铵盐的溶解度(盐析效应)。此外，还测定了草酸氢铵/水体系的部分相图。
The solubility of the sodium and ammonium salts of oxalic acid in water with ammonium sulfate present has been studied using differential scanning calorimetry, X-ray crystallography, and infrared spectroscopy. The crystals that form from aqueous mixtures of ammonium sulfate/sodium hydrogen oxalate were determined to be sodium hydrogen oxalate monohydrate under low ammonium sulfate conditions and ammonium hydrogen oxalate hemihydrate under high ammonium sulfate conditions. Crystals from aqueous mixtures of ammonium sulfate/sodium oxalate were determined to be ammonium oxalate monohydrate under moderate to high ammonium sulfate concentrations and sodium oxalate under low ammonium sulfate concentrations. It was also found that ammonium sulfate enhances the solubility of the sodium oxalate salts (salting in effect) and decreases the solubility of the ammonium oxalate salts (salting out effect). In addition, a partial phase diagram for the ammonium hydrogen oxalate/water system was determined.