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Selective interaction of synthetic and natural pesticides with metal ions in micellar media: extractions using aqueous biphasic systems
Colloid and Polymer Science ( IF 2.2 ) Pub Date : 2020-10-06 , DOI: 10.1007/s00396-020-04760-y
Laboni Das , Sankar Prasad Paik , Kamalika Sen

Synthetic pesticides represent a class of toxic chemical compounds which are now slowly being replaced by some natural alternatives. Here we have considered two pesticides, a synthetic one (chlorpyrifos) and another naturally obtained (eugenol) pesticide, to make a comparative study of their interaction towards metal ions (Cu2+, Co2+, Ni2+ and Zn2+). A thorough study of their extraction patterns in aqueous biphasic system (ABS) has been done. Both water and 50% (w/v) (83 mM) PEG#6000 media were taken to perform the metal-pesticide complexation study. We found a selective interaction between chlorpyrifos and copper ion in PEG media. The newly formed copper-chlorpyrifos complex gives a characteristic λmax at 322 nm in UV-Vis spectral study. The binding constant of the complex is 14.48 × 103 mol−1 (from B-H plot) and it follows the first-order reaction kinetics. To study the extraction pattern, two ABSs are considered, one is PEG#6000-sodium tartrate and another one is PEG#6000-sodium citrate. Using these two ABSs, chlorpyrifos, eugenol, copper and copper-chlorpyrifos complex were extracted at different pHs (5, 7 and 9) of the salt-rich phases. Complete extractions were observed for eugenol, chlorpyrifos and Cu-chlorpyrifos complexes from all the pH of tartrate as salt-rich phase. The micellar medium of PEG#6000 is most favourable to form Cu-chlorpyrifos complex and for extraction study. The polymer-rich phase was regenerated using ultracentrifugation, thermoseparation and ion exchange methods for reuse.

中文翻译:

胶束介质中合成和天然农药与金属离子的选择性相互作用:使用水性双相系统提取

合成农药代表了一类有毒化合物,现在正慢慢被一些天然替代品所取代。在这里,我们考虑了两种农药,一种合成农药(毒死蜱)和另一种天然获得的(丁子香酚)农药,以比较研究它们与金属离子(Cu2+、Co2+、Ni2+ 和 Zn2+)的相互作用。已经对它们在水性双相系统 (ABS) 中的提取模式进行了彻底的研究。使用水和 50% (w/v) (83 mM) PEG#6000 培养基进行金属-农药复合研究。我们发现 PEG 介质中毒死蜱和铜离子之间存在选择性相互作用。在 UV-Vis 光谱研究中,新形成的铜-毒死蜱复合物在 322 nm 处具有特征 λmax。复合物的结合常数为 14。48 × 103 mol−1(来自 BH 图),它遵循一级反应动力学。为了研究萃取模式,考虑了两种 ABS,一种是 PEG#6000-酒石酸钠,另一种是 PEG#6000-柠檬酸钠。使用这两种 ABS,在富盐相的不同 pH 值(5、7 和 9)下提取毒死蜱、丁子香酚、铜和铜-毒死蜱复合物。观察到丁子香酚、毒死蜱和铜毒死蜱复合物从酒石酸盐的所有 pH 值中完全提取为富盐相。PEG#6000 胶束介质最有利于形成Cu-毒死蜱复合物和进行提取研究。使用超速离心、热分离和离子交换方法再生富含聚合物的相以供再利用。一种是PEG#6000-酒石酸钠,另一种是PEG#6000-柠檬酸钠。使用这两种 ABS,在富盐相的不同 pH 值(5、7 和 9)下提取毒死蜱、丁子香酚、铜和铜-毒死蜱复合物。观察到丁子香酚、毒死蜱和铜毒死蜱复合物从酒石酸盐的所有 pH 值中完全提取为富盐相。PEG#6000 胶束介质最有利于形成Cu-毒死蜱复合物和进行提取研究。使用超速离心、热分离和离子交换方法再生富含聚合物的相以供再利用。一种是PEG#6000-酒石酸钠,另一种是PEG#6000-柠檬酸钠。使用这两种 ABS,在富盐相的不同 pH 值(5、7 和 9)下提取毒死蜱、丁子香酚、铜和铜-毒死蜱复合物。观察到丁子香酚、毒死蜱和铜毒死蜱复合物从酒石酸盐的所有 pH 值中完全提取为富盐相。PEG#6000 胶束介质最有利于形成Cu-毒死蜱复合物和进行提取研究。使用超速离心、热分离和离子交换方法再生富含聚合物的相以供再利用。毒死蜱和铜毒死蜱复合物从酒石酸盐的所有 pH 值中作为富盐相。PEG#6000 胶束介质最有利于形成Cu-毒死蜱复合物和进行提取研究。使用超速离心、热分离和离子交换方法再生富含聚合物的相以供再利用。毒死蜱和铜毒死蜱复合物从酒石酸盐的所有 pH 值中作为富盐相。PEG#6000 胶束介质最有利于形成Cu-毒死蜱复合物和进行提取研究。使用超速离心、热分离和离子交换方法再生富含聚合物的相以供再利用。
更新日期:2020-10-06
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