Preparation of Pb(II) Ion Imprinted Polymer and Its Application as the Interface of an Electrochemical Sensor for Trace Lead Determination

Abstract

An ion imprinted polymer (IIP) was synthesized by using Pb(II) as a template, methacrylic acid as a monomer, 8-hydoxyquinoline as a ligand, ethylene glycol dimethacrylate (EGDMA) as a crosslinker, and azobisisobutyronitrile as initiator. It can be applied to prepare lead ion selective voltammetric sensor for Pb(II) adsorption and trace detection. The Pb(II)-IIP was characterized by FTIR spectra and SEM image. Under optimized conditions of polymerization, the Pb(II)-IIP showed good adsorption behavior toward Pb(II), with a magnitude of three times higher than that of the non imprinted polymer (NIP). Also, it exhibited a favorable selectivity for Pb(II), compared with other heavy metal ions of Hg(II), Cd(II), Cu(II), and a negligible adsorption to the other cations. The synthesized IIP was used to determine trace levels of Pb(II) in food and water samples, with a calibration linear range over Pb(II) concentrations of 0.05 -60 μM and a limit of detection at 0.01 μM.

Thẩm Định Quy Trình Phân Tích Chì Trong Nước Bằng Phương Pháp Phổ Hấp Thu Nguyên Tử Kết Hợp Với Vật Liệu Polymer in Dấu Ion

“…Chì có thể tích tụ trong cơ thể người gây nên các ngộ độc mãn tính bao gồm các tổn thương dạ dày, thiếu máu hoặc các tác hại vĩnh viễn đến mắt cá chân, ngón tay, thậm chí cả não bộ. Ngoài ra, chì còn là tác nhân gây ung thư, ảnh hưởng đến sức khỏe và các quá trình trao đổi chất của con người [1][2][3]. Theo Cơ quan bảo vệ môi trường Hoa Kỳ, chì hiện được xếp vào nhóm chất gây ung thư ở người thuộc nhóm B2.…”

Recent advances in portable heavy metal electrochemical sensing platforms

“…128 Those MIPs that can specifically recognise and remove ions are called ion imprinted polymers (IIPs), these benefit from being broadly applicable, highly selective and watercompatible. 129 IIP-based electrochemical sensors have been reported towards Co 2+ , 130 Cd 2+ 131,132 and others 133 exhibiting ultra-trace levels in water samples.…”

Recent Developments in Carbon Sensors for At-Source Electroanalysis

“…The function of IIPs is governed by size and charge exclusion, attracting small metal cations, and differing pore size for each analyte. IIPs have been designed for Pb­(II), Hg­(II), and Ag­(I), and applied in tap, river, and ground waters. − Notably, Sebastian et al introduced MWCNT/IIPs as both a sorbent and a sensor for Pb­(II) and Co­(II), as applied to monitoring lake water, mining effluent, and fertilizer. , Additionally, IIP nanoparticles have been employed to detect Ag­(I), Hg­(II), and Pb­(II). − While attractive, there is still work to be done to improve the analytical response of IIP-based sensors in the context of temporal resolution (oftentimes more than 15 min of preconcentration is required before analysis).…”