학술논문
Design of an optically stable pH sensor based on immobilization of Giemsa on triacetylcellulose membrane.
Document Type
Article
Author
Source
Subject
*ENCAPSULATION (Catalysis)
*PH effect
*CELLULOSE acetate
*ARTIFICIAL membranes
*OPTICAL sensors
*SENSITIVITY analysis
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Language
ISSN
0928-4931
Abstract
In this work a simple, inexpensive, and sensitive optical sensor based on triacetylcellulose membrane as solid support was developed by using immobilization of Giemsa indicator for pH measurement. In this method, the influence variables on the membrane performance including pH concentration of indicator, response time, ionic strength, and reversibility were investigated. At optimum values of all variables the response of optical pH sensor is linear in the pH range of 3.0–12.0. This optical sensor was produced through simultaneous binding of the Giemsa on the activated triacetylcellulose membrane which responded to the pH changes in a broader linear range within less than 2.0 min and suitable reproducibility (RSD < 5%). Stability results showed that this sensor was stable after 6 months of storage in the water/ethanol (50:50, v/v) solution without any measurable divergence in response properties (less than 5% RSD). [ABSTRACT FROM AUTHOR]