螯合作用对多重乳液中Cr³⁺释放行为的影响

Influence of Chelation on Release of Cr³⁺ from Multiple Emulsions

王 刚 刘立新 杨腾飞 章 磊 赵晓非

WANG Gang LIU Lixin YANG Tengfei ZHANG Lei ZHAO Xiaofei

以W/O/W多重乳液离子的扩散作用和菲克定律为基础，结合实验动力学数据（Cr3+释放率对应时间的关系），建立预测W/O/W多重乳液Cr3+释放速率动力学模型。分别在20℃和60℃下，记录在10 d内三种不同内水相组成的多重乳液的Cr3+释放率随时间的变化。Cr3+释放的过程主要是在熵的驱动下进行的扩散/渗透现象，膜的破裂（合并）可以忽略。在60℃下，与内水相无螯合剂相比，当内水相中存在螯合剂酒石酸钾钠时，释放率由98%显著降低至70%，有效地延缓了Cr3+的释放。实验的动力学数据与基于扩散和螯合作用的W/O/W多重乳液Cr3+释放速率动力学模型一致性较好。图4表1参13

Based on diffusion action and Fick's law and the kinetic data of the Cr3+ release rate at different time), a kinetic model for predicting Cr3+ release rate of W/O/W multiple emulsion was estabilished. The change of Cr3+ release rate of three different internal water phase of W/O/W multiple emulsion with time was monitored for 10 days at the temperatures of 20℃ and 60℃, respectively. Cr3+ release occurred without film rupturing (coalescence), mainly due to entropically driven diffusion/permeation phenomena. At the temperature of 60℃, compared with non-chelating agents, when there was a chelating agent(potassium sodium tartrate)，the Cr3+ release rate was significantly decreased from 98% to 70%，effectively delaying the release of Cr3+.The kinetic data were consistent with the kinetic model based on diffusion action and chromium chelation.