00000caa a22000003i 4500 UP-1685594773862388605 Buklod 20210322113004.0 m | | ta 210322s2018 xx r |||| u|eng d (iLib)UPBAG-00039569033 STII-DOST BAG rda eng ARTICLE-2790 Buenaventura, Angelo Gabriel E. author. Chemiluminescence detection of chlorpyrifos via luminol-h2o2-ferricyanide system using microcontroller-based photometer by Angelo Gabriel E. Buenaventura and Allan Christopher C. Yago. 2018. pages 753-762 color illustrations 26 cm text rdacontent unmediated rdamedia volume rdacarrier Includes bibliographical references (pages 760-762) A low-cost photometer for chemiluminescence (CL) detection of chlorpyrifos (CPF) was constructed based on Arduino microcontroller, Si photodiode, and operational amplifier. The CPF detection via CL is based on the decrease in light intensity of the sensing solution (luminol-H2O2-Fe(CN)63--CPF) as compared to the blank solution (luminol-H2O2 Fe(CN)63-). The decrease in light intensity is due to the known reaction of organophosphates with H2O2 and luminol, thereby consuming the reactants for CL reaction. The change in response (ΔICL) was determined by the difference between the response of the blank solution (IB) and the sensing solution (Iss). Different parameters for both blank and sensing solutions were optimized. A linearly decreasing response with increasing CPF concentration was found between 0.7 ppm and 2.45 ppm CPF (2.00?7.00 μM CPF), with a limit of detection (LOD) of 0.663 ppm (1.89μM). The system was shown to be selective mainly toward organophosphate pesticides as nonorganophosphate herbicides ? such as 2,4-dichlorophenoxyacetic acid (2,4-D) and atrazine ? did not show significant changes in response as compared to blank solution. (Author's abstract) Chemistry. Chemiluminescence. Chlorpyrifos. Luminol. Microcontroller. Yago, Allan Christopher C. author. The Philippine Journal of Science Vol. 147, no. 4, December 2018. Request full-text access via UPB University Library through https://forms.gle/KZjBv7aRtY6jiL5E9 (viewed 22 March 2021) FI UPBAG UPBAG-MAIN ARTICLE-2790 Analytics