Indirect spectrophotometric determination of sulfur dioxide (sulfite) |
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| Affiliation: | 1. Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China;2. Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Hunan University, Changsha 410082, PR China;3. School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, PR China;1. Biochemistry Postgraduate Program, Biosciences Center, Federal University of Rio Grande do Norte, Natal, Brazil;2. Nutrition Postgraduate Program, Center for Health Sciences, Federal University of Rio Grande do Norte, Natal, Brazil;3. Department of Nutrition, Center for Health Sciences, Federal University of Rio Grande do Norte, Natal, Brazil |
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| Abstract: | Sodium sulfite/sulfur dioxide reacts with iron(III) in acidic range (pH 2–3.5) to form iron(II) which is complexed with 1,10-phenanthroline to form a stable orange-red complex with maximum absorption at 510 nm. Beer's Law is obeyed over the concentration range of 0.5–10 ppm of sulfur dioxide. |
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