Mohd N I, Raoov M, Mohamad S, Zain N N M
Integrative Medicine Cluster, Advanced Medical and Dental Institute (AMDI), Universiti Sains Malaysia 13200 Kepala Batas Penang Malaysia
Department of Chemistry, Faculty of Science, Universiti Malaya 50603 Kuala Lumpur Malaysia.
RSC Adv. 2018 Apr 11;8(24):13556-13566. doi: 10.1039/c8ra00868j. eCollection 2018 Apr 9.
Cloud point extraction (CPE) - spectrophotometric method had been adopted for the separation of atrazine using the non-ionic silicone surfactant, polysiloxane polyether, as a new approach of atrazine extractor in CPE. There were two types of polysiloxane polyether (DC 193C and OFX 0309) studied to investigate the effectiveness of these surfactants toward atrazine in CPE method. Various effects of operating parameters such as the concentration of surfactant and atrazine, addition of salt and change of temperature and pH on the extraction of atrazine have been studied in detail to find the optimum conditions. The limit of detections (LODs) and quantifications (LOQs) were in the range of 0.09-0.59 μg L and 0.31-1.95 μg L in water samples, respectively. The method recoveries at two spiked levels were 84-105% (CPE-OFX 0309) and 59-69% (CPE-DC 193C) with good correlation of determination ( ) ranging from 0.9927-0.9993 for both methods. The Langmuir isotherm has been used for solubilisation study of surfactant and atrazine. The thermodynamic parameters have been determined such as Gibbs free energy (Δ°) which increases with temperature, value of enthalpy (Δ°) and value of entropy (Δ°) which increase with the surfactant hydrophobicity.
浊点萃取（CPE）-分光光度法已被用于采用非离子型有机硅表面活性剂聚硅氧烷聚醚分离阿特拉津，这是CPE中阿特拉津萃取的一种新方法。研究了两种聚硅氧烷聚醚（DC 193C和OFX 0309），以考察这些表面活性剂在CPE法中对阿特拉津的萃取效果。详细研究了操作参数如表面活性剂和阿特拉津浓度、盐的添加、温度和pH值变化对阿特拉津萃取的各种影响，以找到最佳条件。水样中的检测限（LOD）和定量限（LOQ）分别在0.09 - 0.59 μg/L和0.31 - 1.95 μg/L范围内。两种加标水平下的方法回收率分别为84 - 105%（CPE - OFX 0309）和59 - 69%（CPE - DC 193C），两种方法的测定相关系数（ ）在0.9927 - 0.9993范围内。朗缪尔等温线已用于表面活性剂和阿特拉津的增溶研究。已确定了热力学参数，如吉布斯自由能（Δ°）随温度升高而增加，焓值（Δ°）和熵值（Δ°）随表面活性剂疏水性增加而增加。
