Sensor for amperometric determination of ammonia and ammonia-forming enzyme reactions

被引:49
作者
Strehlitz, B
Gründig, B
Kopinke, H
机构
[1] UFZ Helmholtz Ctr Environm Res, Ctr Environm Biotechnol, UbZ, D-04318 Leipzig, Germany
[2] Senslab Gmbh, D-04318 Leipzig, Germany
关键词
amperometric enzyme sensor; polyaniline film; ammonia; screen printed electrode; urea;
D O I
10.1016/S0003-2670(99)00594-2
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The amperometric ammonia determination by use of a polyaniline-modified screen printed Pt-C electrode at 0.3 V (versus Ag/AgCl on the strip) is shown. The electrochemical pulse polarization method is used for the modification. The effects of basic electrode material, applied potential, pH of buffer solution and possible interferences of other ions were studied. The polyaniline-modified Pt-C electrode measures (NH4)(2)SO4 with a detection limit of 5 mu M, a linear range up to 1 mM and a sensitivity of 40 +/- 20 mu A cm(-2) mM(-1). A new generation of enzyme sensors arises from the immobilization of ammonia-forming enzymes in a poly(carbamoyl)sulphonate hydrogel matrix on the working electrode as it is shown for urease to detect urea. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:11 / 23
页数:13
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