Carabias-Martínez R, Rodríguez-Gonzalo E, Domínguez-Alvarez J, García Pinto C, Hernández-Méndez J
Departamento de Química Analítica, Nutrición y Bromatología, Facultad de Química, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, Spain.
J Chromatogr A. 2003 Jul 11;1005(1-2):23-34. doi: 10.1016/s0021-9673(03)00885-9.
A preconcentration study based on the cloud point phenomenon was carried out for a set of triazine herbicides, three of them chloro-substituted and three of them methylthio-substituted. Concentration factors and recoveries were calculated as function of the percentage of the non-ionic surfactant Triton X-114 employed. From these values, obtained from a cloud point extraction (CPE) procedure, the distribution coefficient between the Triton X-114 micelles and water, Kc, prior to CPE was calculated for each triazine and related to the corresponding octanol-water partition coefficient, Kow. In order to confirm the results obtained with the triazine herbicides, two sets of data from chemically different organic pollutants--organophosporous and chlorophenols--obtained from the literature were assessed, concluding that they display a similar behaviour to that of the triazine herbicides. This can be used to predict the CPE behaviour of other organic pollutants from their octanol-water partition coefficients. The Kc values were compared with the analyte concentration ratio in the surfactant-rich phase and aqueous phase (Ksa) with a view to obtaining a link between the analyte behaviour prior to and after cloud point extraction procedures.
基于浊点现象对一组三嗪类除草剂进行了预富集研究，其中三种为氯取代型，三种为甲硫基取代型。计算了富集因子和回收率与所使用的非离子表面活性剂Triton X - 114百分比的函数关系。根据浊点萃取（CPE）程序得到的这些值，计算了每种三嗪在CPE之前Triton X - 114胶束与水之间的分配系数Kc，并将其与相应的正辛醇 - 水分配系数Kow相关联。为了证实三嗪类除草剂所获得的结果，对从文献中获取的两组来自化学性质不同的有机污染物——有机磷和氯酚的数据进行了评估，得出它们与三嗪类除草剂表现出相似行为的结论。这可用于根据其他有机污染物的正辛醇 - 水分配系数预测其CPE行为。将Kc值与富含表面活性剂相和水相中分析物的浓度比（Ksa）进行比较，以建立浊点萃取程序前后分析物行为之间的联系。
