The use of a polymer inclusion membrane in a paper-based sensor for the selective determination of Cu(II)

被引:57
作者
Jayawardane, B. Manori [1 ,2 ]
Coo, Lilibeth DlC [1 ,3 ]
Cattrall, Robert W. [1 ]
Kolev, Spas D. [1 ,2 ]
机构
[1] Univ Melbourne, Sch Chem, Melbourne, Vic 3010, Australia
[2] Univ Melbourne, CAPIM, Melbourne, Vic 3010, Australia
[3] Univ Philippines, Inst Chem, Quezon City 1101, Philippines
基金
澳大利亚研究理事会;
关键词
Polymer inclusion membrane (PIM); Paper based sensor (PBS); Detection of Cu(II); 1-(2-Pyridylazo)-2-naphthol (PAN); Di(2-ethlyhexyl) phosphoric acid (D2EHPA); FLOW-INJECTION ANALYSIS; MICROFLUIDIC DEVICES; METAL-IONS; EXTRACTION; TRANSPORT; SEPARATION; MONOLAYER; RECOVERY;
D O I
10.1016/j.aca.2013.07.029
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A disposable paper-based sensor (PBS) is described for the determination of Cu(II) in natural and waste waters at approximately 2 cents per measurement. The device makes use of a polymer inclusion membrane (PIM) to provide the selectivity for Cu(II). The PIM consists of 40 wt% di(2-ethlyhexyl) phosphoric acid (D2EHPA) as the carrier, 10 wt% dioctyl phthalate (DOP) as a plasticizer, 49.5 wt% poly( vinyl chloride) (PVC) as the base polymer and 0.5 wt% (m m(-1)) 1-(2'-pyridylazo)-2-naphthol (PAN) as the colourimetric reagent. High selectivity under mildly acidic conditions (HC1, pH 2.0) is achieved for Cu(II) in the presence of frequently encountered metal ions in natural and waste waters such as Fe(III), Al(III), Zn(II), Cd(II), Pb(II), Ca(II), Mg(II), and Ni(II). The laminated PBS consists of a PIM sensing disc (2 mm in diameter) attached to the centre of a circular hydrophilic zone (7 mm in diameter) pretreated with 0.01 M HCl. This hydrophilic zone separates the sample port (a circular hole in the plastic cover) from the PIM sensing disc. After introducing 19.2 mu L, of a sample/standard solution to the sample port, Cu(II) diffuses across the hydrophilic zone and is extracted into the PIM disc as the Cu(II)-D2EHPA complex which subsequently reacts with PAN to produce the red-purple coloured Cu(II)-PAN complex. The colour intensity of the PIM disc is measured 15 min after sample/standard introduction by scanning using a flatbed scanner. Under optimal conditions the device is characterized by a limit of detection (LOD) and limit of quantitation (LOQ) of 0.06 and 0.21 mg L-1 Cu(II), respectively, with two linear ranges together covering the Cu(II) concentration range from 0.1 to 30.0 mg L-1.The PBS was successfully applied to the determination of Cu(II) in hot tap water and mine tailings water. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:106 / 112
页数:7
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