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Conference information: Abstracts, 15th Iranian Chemistry Congress

Abstract: Triazines are a group of herbicides with increased application in agriculture. They can be present as pollutants, e.g., in water and fruits [1]. Taking into account the proximity of their analytical signals, the simultaneous analysis of the respective mixtures by direct measurements, is not possible. On the other hand, the most works on the development of the sensors have been done on single analye determinations. In a completely rational and designed approach, simultaneous determination of cyanazine and propazine in environmental and food samples was performed using a molecularly imprinted polymer (MIP) modified carbon paste electrode [2] and partial least squares (PLS) [3]. Following a theoretical study for finding the best constituents for MIP preparation, it was synthesized as selective adsorbents after incorporating in a carbon paste electrode for the simultaneous determination of cyanazine and propazine. The MIP modified carbon paste electrode showed improved qualities such as, simplicity of electrode preparation, a wider linear range, lower detection limits (DL), higher selectivity, and more stability of the used modifier. In an experimental design approach, important parameters were identified and their optimum conditions were selected. The procedure is based on the reduction of cyanazine and propazine after their selective extraction into the carbon paste electrode. In order to reduce the analysis time, the stripping voltammetric (SV) method was used in which electrode washing step was omitted while two other steps (analyte extraction and electrochemical measurements) take place in one step. The cathodic differential pulse voltamograms of the mixtures were analyzed by PLS as a multivariate calibration technique. The developed sensor was successfully applied for the simultaneous determination of cyanazine and propazine in environmental and food samples
Template and target information: cynazine, propazine