The 2-aminomethylpyridine anchored silica gel (AMPSG) was successfully used as a sorbent in a simple spectrophotometric flow system for Cu 2+ preconcentration in natural water samples, using sodium diethyldithiocarbamate as chromogenic agent (460?nm). The system was optimized using a full factorial design 2 5 to determine better analytical conditions to determine copper in the natural water samples such as those from river, tap, stream, spring, well, waste, synthetic brackish water and a water reference material (NIST-1640). The better conditions used were: 180?s loading; 30?s elution; 30?s regeneration of the column; loading flow rate 6.6?mL?min -1 ; buffer solution for the preconcentration and regeneration of the column-acetate buffer pH 5.75; elution flow rate 1.6?mL?min -1 ; eluent composition 0.20?mol?L -1 HNO3. Under these conditions, the preconcentration factor obtained was 77, and the detection limit achieved was 3.0?ng?mL -1 . The recovery of spiked water samples ranged from 95.2 to 104.7%.
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