Monitoring nitrite with optical sensing films

Authors: Ali A Ensafi, A Kazemzadeh

Publication date: 2002/7/31

Journal name: Microchemical journal

Volume: 72

Pages: 193-199

Publisher: Elsevier

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 ...