A novel mixed matrix membrane of phenolphthalein hydrazide and polysulfone for the detection of copper ions in environmental water samples.

Sreeramareddygari, Muralikrishna; Kempahanumakkagari, Sureshkumar; Mahesh, Padaki; Thippeswamy, Ramakrishnappa; Devaramani, Samrat; Mardi, Radhakrishna Reddy; Carlos, Fernandez; Govindappa, Banuprakash

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.

Citation

SREERAMAREDDYGARI, M., KEMPAHANUMAKKAGARI, S., MAHESH, P., THIPPESWAMY, R., DEVARAMANI, S., MARDI, R.R., CARLOS, F. and GOVINDAPPA, B. 2019. A novel mixed matrix membrane of phenolphthalein hydrazide and polysulfone for the detection of copper ions in environmental water samples. Environmental progress and sustainable energy [online], 38(5), article number 13167. Available from: https://doi.org/10.1002/ep.13167

• Journal Article Type: Article
• Acceptance Date: Jan 2, 2019
• Online Publication Date: Jan 21, 2019
• Publication Date: Oct 31, 2019
• Deposit Date: Feb 25, 2019
• Publicly Available Date: Jan 22, 2020
• Journal: Environmental progess and sustainable energy
• Print ISSN: 1944-7442
• Electronic ISSN: 1944-7450
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 38
• Issue: 5
• Article Number: 13167
• DOI: https://doi.org/10.1002/ep.13167
• Keywords: Chemodosimeter; Phenolphthalein; Hydrazide; Polysulfone membrane; Naked eye sensor; Phenolphthalein
• Public URL: http://hdl.handle.net/10059/3309
• Contract Date: Feb 25, 2019