当前位置: X-MOL 学术Appl. Geochem. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Experimental Determination of Solubilities of Tri-calcium Di-Citrate Tetrahydrate [Ca3[C3H5O(COO)3]2•4H2O], Earlandite, in NaCl and MgCl2 Solutions to High Ionic Strengths
Applied Geochemistry ( IF 3.4 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.apgeochem.2020.104856
Yongliang Xiong

Abstract In this study, solubility measurements on tri-calcium di-citrate tetrahydrate [Ca3[C3H5O(COO)3]2•4H2O, abbreviated as Ca3[Citrate]2•4H2O, earlandite] as a function of ionic strength are conducted in NaCl solutions up to I = 5.0 mol•kg–1 and in MgCl2 solutions up to I = 7.5 mol•kg–1, at room temperature (22.5 ± 0.5oC). The solubility constant ( log K s p 0 ) for Ca3[Citrate]2•4H2O and formation constant ( log β 1 0 ) for Ca[C3H5O(COO)3]–, are determined as –18.11 ± 0.15 and 4.97 ± 0.15, respectively, with a set of Pitzer parameters describing the specific interactions in NaCl and MgCl2 media. The solubility measurements and thermodynamic modeling indicate that earlandite could become a solubility-controlling phase for citrate in geological repositories for nuclear waste when the inventories of citrate reach the saturation concentrations for Ca3[Citrate]2•4H2O, and it is a solubility-limiting phase for calcium/citrate in other low temperature environments such as agro-food industrial waste-waters. The Pitzer model presented in this work will enable researchers to assess the role of citrate in low temperature environments over a wide range of ionic strengths, and is expected to find applications in many fields such as food and pharmaceutical sciences as well as nuclear waste management.

中文翻译:

实验测定四水柠檬酸二钙 [Ca3[C3H5O(COO)3]2•4H2O],Earlandite,在 NaCl 和 MgCl2 溶液中的高离子强度溶解度

摘要 在本研究中,四水柠檬酸三钙 [Ca3[C3H5O(COO)3]2•4H2O,缩写为 Ca3[Citrate]2•4H2O,earlandite] 作为离子强度的函数,在 NaCl 中进行了溶解度测量。在室温 (22.5 ± 0.5oC) 下,溶液高达 I = 5.0 mol•kg–1,在 MgCl2 溶液中高达 I = 7.5 mol•kg–1。Ca3[Citrate]2•4H2O 的溶解度常数 (log K sp 0 ) 和 Ca[C3H5O(COO)3]– 的形成常数 (log β 1 0 ) 分别确定为 –18.11 ± 0.15 和 4.97 ± 0.15 ,一组 Pitzer 参数描述了 NaCl 和 MgCl2 介质中的特定相互作用。溶解度测量和热力学模型表明,当柠檬酸盐存量达到 Ca3[Citrate]2•4H2O 的饱和浓度时,Earlandite 可能成为核废料地质处置库中柠檬酸盐的溶解度控制相,并且是溶解度限制相用于其他低温环境中的钙/柠檬酸盐,例如农业食品工业废水。这项工作中提出的 Pitzer 模型将使研究人员能够评估柠檬酸盐在低温环境中在广泛的离子强度范围内的作用,并有望在食品和制药科学以及核废物管理等许多领域找到应用。它是其他低温环境(如农业食品工业废水)中钙/柠檬酸盐的溶解度限制相。这项工作中提出的 Pitzer 模型将使研究人员能够评估柠檬酸盐在低温环境中在广泛的离子强度范围内的作用,并有望在食品和制药科学以及核废物管理等许多领域找到应用。它是其他低温环境(如农业食品工业废水)中钙/柠檬酸盐的溶解度限制相。这项工作中提出的 Pitzer 模型将使研究人员能够评估柠檬酸盐在低温环境中在广泛的离子强度范围内的作用,并有望在食品和制药科学以及核废物管理等许多领域找到应用。
更新日期:2021-02-01
down
wechat
bug