Development of optical test strip for rapid determination of trace arsenic using immobilized gallocyanine

• Main Authors: Yusof, Nor Azah, Rashid, Khairunnisa
• Format: Article
• Language: English
• Published: Chemic Publishing Company 2009
• Online Access: http://psasir.upm.edu.my/id/eprint/14033/1/Development%20of%20optical%20test%20strip%20for%20rapid%20determination%20of%20trace%20arsenic%20using%20immobilized%20gallocyanine.pdf; http://psasir.upm.edu.my/id/eprint/14033/

Irreversible test strip for the determination of arsenic has been developed. It has a rectangular sensing zone containing all the reagents necessary to produce a selective response to arsenic and formed by immobilized gallocyanine inside chitosan membrane. This method offer sensitivity and simplicity in detecting arsenic as no prior treatment or extraction is required. A linear response was attained in the arsenic concentration in the range of 10 to 30 ppm with calculated limit of detection of 0.96 ppm. This method also showed a reproducible result with relative standard deviation (RSD) of 0.87% and response time of ~5min. Interference studies showed that Pb(II) and Ni(II) significantly interfered during the determination. The developed sensor has been validated against Atomic Absorption Spectroscopy method and proven comparable.