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Factorial design for optimization of flow-injection preconcentration procedure for copper(II) determination in natural waters, using 2-aminomethylpyridine grafted silica gel as adsorbent and spectrophotometric detection

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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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Keywords: 2-Aminomethylpyridine grafted silica gel; Copper preconcentration; Factorial design; Flow injection; Spectrophotometry; Water samples

Document Type: Research Article

Affiliations: 1: Instituto de Química, Universidade Federal do Rio Grande do Sul, Caixa Postal 15003, CEP 91501-970 Porto Alegre-RS, Brazil 2: Instituto de Química, Universidade Estadual de Campinas, Caixa Postal 6154, CEP 13084-971 Campinas-SP, Brazil

Publication date: June 15, 2005

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