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Spectrophotometric method for determination of aluminium content in water and beverage samples employing flow-batch sequential injection system
Institution:1. Department of Chemistry, Faculty of Science, and Chemistry Research Group for Green Innovation, Center of Excellence for Innovation in Analytical Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand;2. Creative Chemistry and Innovation Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahasarakham University, Maha Sarakham 44150, Thailand;1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS-16, Cambridge, MA 02138, USA;2. Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA;3. European Southern Observatory, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago 19, Chile;4. Southwest Research Institute, 1050 Walnut St. Suite 300, Boulder, CO 80302, USA;5. Institut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris, UMR8028 CNRS, 77 av. Denfert-Rochereau, 75014 Paris, France;6. LESIA, Observatoire de Paris, F-92195 Meudon Principal Cedex, France;7. Université Denis Diderot, Sorbonne Paris Cité, 4 rue Elsa Morante, 75205 Paris Cedex 13, France;8. Department of Astronomy, University of Virginia, Charlottesville, VA 22904-4325, USA;1. School of Engineering, Cardiff University, Queen''s Buildings, The Parade, Cardiff CF24 3AA, Wales, United Kingdom;2. Department of Aeronautics, Roderic Hill Building, Imperial College, London SW7 2AZ, United Kingdom;3. School of Mathematics, Cardiff University, Senghennydd Road, Cardiff CF24 4AG, United Kingdom;2. Charlie Norwood VA Medical Center, Augusta, GA 30904, USA;1. Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, United States;2. Lowell Observatory, Flagstaff, AZ 86001, United States;3. Texas A&M University, College Station, TX 77843, United States;4. Arizona State University, Tempe, AZ 85287, United States;5. Jet Propulsion Laboratory, Pasadena, CA 91011, United States
Abstract:A sensitive, precise and reliable flow-batch method for the determination of aluminium (Al) was developed using a sequential injection-monosegmented flow system incorporating a mixing chamber unit. Eriochrome cyanine R (ECR) was used as a chromogenic reagent in the presence of N,N-dodecyltrimethylammonium bromide (DTAB). The Al-ECR complex at pH 6 gave a maximum absorption at 584 nm. In-line single standard calibration and a standard addition procedure were developed employing the monosegmented flow technique. Under the optimum conditions, a linear calibration graph in the range of 0.0075–0.625 mg L?1 Al was obtained with limits of detection and quantitation of 0.0020 and 0.0070 mg L?1, respectively. Relative standard deviations were 0.8 and 1.3% for 0.010 and 0.025 mg L?1 Al (n = 11), respectively. A sample throughput of 24 h?1 using an in-line standard calibration approach and 6 h?1 using four standard addition levels was achieved. The developed system was successfully applied to water samples and beverage samples. The results agreed well with those obtained from the ICP-AES method. Good recoveries between 85 and 104% were obtained.
Keywords:Flow-batch analysis  Sequential injection  Monosegmented flow analysis  Spectrophotometry  Aluminium  Eriochrome cyanine R  Water  Beverage  Food analysis  Food composition  Food safety  Heavy metals in food chain  Food safety and Heavy metals in food chain
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