Advances in impinging stream processing of agricultural and biological products
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Author list: Prachayawarakorn S., Devahastin S., Soponronnarit S.
Publisher: Wiley
Publication year: 2019
Journal: Environmental Progress & Sustainable Energy (1944-7442)
Volume number: 38
Issue number: 5
Start page: 53
End page: 76
Number of pages: 24
ISSN: 1944-7442
eISSN: 1944-7450
Languages: English-Great Britain (EN-GB)
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Abstract
The novel membrane test strip of phenolphthalein hydrazide (PH)-polysulfone has been designed and demonstrated for Cu2+ ions detection. Before finding performance of membrane the studies with PH alone has been performed. Aqueous solutions of PH are colorless, but upon interaction with Cu2+ ions become pink (when 8.2 ≤ pH ≥ 12). The colorimetric change is initiated by the coordination of Cu2+ with PH as a polydentate ligand, opening the spirolactam ring that subsequently hydrolyses releasing phenolphthalein (P). Further membrane was preloaded with PH that could be used as a simple, low cost, and portable sensor for Cu2+ ions in environmental water samples. Given the detection limits of this sensor, a maximum response would warn the tester that Cu2+ concentrations were above safe drinking regulation values. Approximate concentrations can be determined via a color comparison chart. Different metal ions were tested in order to determine the chemodosimeters specificity, of the 12 tested ions only Hg2+ induced a similar molecular transformation (i.e., PH to P). The chemodosimeter allows the quantification of Cu2+ ions in the linear dynamic range of 0–22 μM. The Sandell sensitivity, limit of detection, limit of quantification, and relative standard deviation were found to be 0.276 μg/mL/cm2, 0.279 μM, 1.674 μM, and 0.682% respectively. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019. © 2019 American Institute of Chemical Engineers
Keywords
chemodosimeter, naked eye sensor, phenolphthalein, phenolphthalein hydrazide, polysulfone membrane
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