4-Amino-4'-nitrobiphenyl, which is formed by catalytic effect of trichlorfon on sodium perborate oxidizing benzidine, is extracted with a cloud point extraction method and then detected using a high performance liquid chromatography with ultraviolet detection (HPLC-UV). Under the optimum experimental conditions, there was a linear relationship between trichlorfon in the concentration range of 0.01-0.2 mgL(-1) and the peak areas of 4-amino-4'-nitrobiphenyl (r=0.996). Limit of detection was 2.0 microgL(-1), recoveries of spiked water and cabbage samples ranged between 95.4-103 and 85.2-91.2%, respectively. It was proved that the cloud point extraction (CPE) method was simple, cheap, and environment friendly than extraction with organic solvents and had more effective extraction yield.
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Article Synopsis
- The study proposes that water-in-water (W/W) emulsions can be created by mixing a polymer and a surfactant, leading to phase segregation when the surfactant's cloud temperature is lowered.
- Experiments involved using an ethoxylated triglyceride surfactant (Kolliphor ELP) with gelatin, where the gelatin reduced the surfactant's cloud temperature, allowing for two distinct aqueous phases to form.
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