Monitoring nitrite with optical sensing films |
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Authors: | Ali A. EnsafiA. Kazemzadeh |
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Affiliation: | a College of Chemistry, Isfahan University of Technology, Isfahan, Iran b Materials & Energy Research Centre, P.O. Box 14155-4777, Tehran, Iran |
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Abstract: | A new, low-cost nitrite sensor was developed by immobilizing a direct indicator dye in an optical sensing film for food and environmental monitoring. This sensor was fabricated by binding Safranine O to a cellulose acetate film that had previously been subjected to an exhaustive base hydrolysis. The membrane has good durability (>12 months) and a short response time (<8 s). Nitrite can be determined for the range of 0.005-2.00 μg ml−1 with 3δ detection limits of 0.001 μg ml−1. The method is easy to perform and uses acetylcellulose as a carrier. The reagents used for the activity of the cellulose support are inexpensive, non-toxic and widely available. |
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Keywords: | Optical Sensor Nitrite Environmental analysis |
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