Enhancement of electrochemical detection of Pb 2+ by sensor based on track-etched membranes modified with interpolyelect
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Enhancement of electrochemical detection of Pb2+ by sensor based on track-etched membranes modified with interpolyelectrolyte complexes Ilya V. Korolkov1,2,* , Nurdaulet Zhumanazar2, Yevgeniy G. Gorin1,2, Arman B. Yeszhanov1,2, and Maxim V. Zdorovets1,2,3 1
The Institute of Nuclear Physics, Ibragimov Str., 1, 050032 Almaty, Kazakhstan L.N.Gumilyov Eurasian National University, Satpaev Str., 5, 010008 Nur-Sultan, Kazakhstan 3 Ural Federal University, Mira Str. 19, Ekaterinburg, Russia 620002 2
Received: 9 July 2020
ABSTRACT
Accepted: 28 September 2020
This article concerns studies of flexible track-etched membrane modification by photograft polymerization of methacrylic acid and subsequent formation of interpolyelectrolyte complexes with poly(allylamine) for enhancement of properties of electrochemical sensor. Optimal conditions leading to functionalization of the surface and maintenance of the pore structure were found. Membranes were characterized by SEM, FTIR, XPS, gas permeability and colorimetric assay. Square wave anodic stripping voltammetry (SW-ASV) was used for detection of Pb2?. Limits of detection (LOD) for sensors based on nonmodified PET TeMs, membranes modified by graft polymerization of methacrylic acid (PET TeMs-g-PMAA) and membranes modified with interpolyelectrolyte complexes with poly(allylamine) (PET TeMs-g-PMAA-PAlAm) are 3.03, 2.78 and 1.25 lg/L, respectively. Thus, it was shown that the formation of interpolyelectrolyte complexes on the membranes leads to a more accurate detection of lead ions.
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Springer Science+Business
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1 Introduction Heavy metals are one of the main sources of environmental pollutant and their accumulation in the body can lead to different diseases [1]. Pb contamination is one of the most studied since it has high toxicity, non-biodegradable, which is found naturally and has widespread applications in spite of efforts to curtail or prohibit its use in paints, alloys, batteries,
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https://doi.org/10.1007/s10854-020-04556-4
coatings and gasoline. Different body systems such as nervous, reproductive, cardiovascular and renal suffer from exposure to Pb [2]. World Health Organization (WHO) reported that nearly 1 million people died worldwide in 2013 because of lead poisoning [3] and they has established the maximum permissible concentration of lead in water—0.01 mg/L [4]. Thereby, searching effective methods of lead treatment and methods of the detection is high relevant.
J Mater Sci: Mater Electron
Analytical methods such as mass spectrometry and optical emission spectrometry, X-ray fluorescence spectroscopy, absorption spectroscopy and flame atomic absorption spectrometry are standard and certified methods for detection of heavy metal ions in trace concentrations [5, 6]. However, these methods are characterized by complex instrumentation, high cost and time consuming. Electrochemical-stripping analysis is portable, sensitive method, inexpensive, ease of computerization and
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