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A novel mixed matrix membrane of phenolphthalein hydrazide and polysulfone for the detection of copper ions in environmental water samples
Author(s) -
Sreeramareddygari Muralikrishna,
Kempahanumakkagari Sureshkumar,
Mahesh Padaki,
Thippeswamy Ramakrishnappa,
Devaramani Samrat,
Mardi Radhakrishna Reddy,
Carlos Fernandez,
Govindappa Banuprakash
Publication year - 2019
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.13167
Subject(s) - detection limit , phenolphthalein , chemistry , metal ions in aqueous solution , membrane , aqueous solution , polysulfone , ion , copper , linear range , chelation , analytical chemistry (journal) , inorganic chemistry , nuclear chemistry , chromatography , organic chemistry , biochemistry
The novel membrane test strip of phenolphthalein hydrazide (PH)‐polysulfone has been designed and demonstrated for Cu 2+ 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 Cu 2+ ions become pink (when 8.2 ≤ pH ≥ 12). The colorimetric change is initiated by the coordination of Cu 2+ 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 Cu 2+ ions in environmental water samples. Given the detection limits of this sensor, a maximum response would warn the tester that Cu 2+ 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 Hg 2+ induced a similar molecular transformation (i.e., PH to P). The chemodosimeter allows the quantification of Cu 2+ 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/cm 2 , 0.279 μM, 1.674 μM, and 0.682% respectively. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019