Use of sugar cane bagasse as solid phase extractor for cadmium determination by FAAS

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Lima Borges, Elisangela Cardoso [UNESP]
Paiva De Oliveira, Adriana [UNESP]
De Moraes, Mercedes [UNESP]
Gomes Neto, José Anchieta [UNESP]
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The present paper describes the use of sugar cane bagasse as solid phase extractor for cadmium determination after complexation of the analyte with ammonium diethyldithiophosphate (ADDP) and sorption of the Cd-DDP complexes on the solid support. The concomitants were separated using a flow injection analysis (FIA) system coupled to flame atomic absorption spectrometry (FAAS) for determination. The main parameters such as ADDP concentration, acid medium, flow rate, reaction coil length, and reaction time were investigated. The results obtained with HNO3 showed good accuracy and precision. The enhancement factor was 20.5 times for a 120-second preconcentration time, and the analytical frequency was 25 determinations per hour. The calibration curve was linear over the concentration range of 1-40 μg L-1 Cd with a LOD of 0.697 μg L-1 Cd and a relative standard deviation of 0.96% after 12 sucessive measurements of 30 μg L-1 Cd. The proposed method was evaluated for the FIA-FAAS analysis of certified reference materials (tomato leaves, spinach leaves, and bovine liver) and Cd-spiked foods (shrimp, sardine, tuna, chicken liver and bovine liver). Good recoveries (80.0-97.1%) for the Cd-spiked samples and certified reference materials were obtained. The results of bagasse-packed minicolumns were compared with Si-C18 packed minicolumns. The F-test was applied between Si-C18/Bagasse minicolumns, Si-C18/certified values, and bagasse/certified values. It was found that the results were in agreement with the certified values at a 95% confidence level.
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Atomic Spectroscopy, v. 27, n. 5, p. 139-145, 2006.