flow injection-based cloud point extraction of phosalone and ethion in seawater of chabahar bay and determination by high-performance liquid chromatography: study of use of carbon nanotube and nanofibers as a column filler in flow system

This study presents an easy and cost-effective flow-based cloud point extraction (cpe) method for determining partial amounts of two organophosphorus pesticides (phosalone and ethion) in seawater by hplc–uv–vis. in continues cpe methodology, the effect of the different column packing type such as carbon nanotube, polyacrylonitrile nanofiber and fiberglass on pesticide extraction was investigated. the triton x-100 was utilized as nonionic surfactant, and moreover, effect of different parameters such as ph, temperature, extraction time, surfactant concentration, type and volume of the eluent solution on the extraction efficiency was optimized. under optimum conditions, the figures of merit of the method for phosalone and ethion were obtained as: the enrichment factor (172 and 166), line range (0.8–300 and 0.5–300 µg l−1, r 2 = 0.9973 and 0.9982), relative standard deviation in concentration of 200 µg l−1 (%rsd = %5.4 and %7.99, n = 5) and limit of detection (lod = 0.24 and 0.14 µg l−1). the suggested method was successfully used for determination of phosalone and ethion in chabahar bay seawaters with satisfactory results.