Membrane Selection and ISFET Configuration Evaluation for Soil Nitrate Sensing

Successful implementation of site-specific crop management relies on accurate quantification of spatial variation of important factors. Data collection on a finer spatial resolution than is feasible with manual and/or laboratory methods is often required but cost prohibitive. Therefore, there is a need for the development of sensors to more accurately characterize within-field variability. The objective of this research was to investigate matrix membranes produced from different combinations of ligand and plasticizer materials using ion-selective electrode (ISE) technology, and to use selected membranes to develop a nitrate ion-selective field effect transistor (ISFET) which might be integrated with a flow injection analysis (FIA) system for real-time soil analysis. Several ion-selective membranes were tested, and all of the evaluated membranes proved to be viable candidates for the development of a nitrate ISFET. Membranes using methyltridodecylammonium chloride (MTDA) as the ligand showed a better response to nitrates at low concentrations while those using tetradodecylammonium nitrate (TDDA) ligand showed superior selectivity for the nitrate ion. A multi-ISFET nitrate sensor was successfully developed. The electrical responses of the ISFETs were consistent and predictable. While significant difficulty was found in preparing a multi-ISFET chip with all four sensors operational, once prepared, the multi-ISFET chips were reliable and performed through extensive tests without failure. The sensitivities of the nitrate ISFETs (38-46 mV/decade) were lower than the theoretical Nernst sensitivity. The nitrate ISFETs proved to be viable sensors for the development of a real-time soil nitrate analysis system, under the conditions of our tests.

[1]  N. Jaffrezic‐Renault,et al.  Flow-through pH-ISFET detector for flow-injection analysis , 1989 .

[2]  J. Zemel.  Ion-Sensitive Field Effect Transistors and Related Devices , 1975 .

[3]  P. Worsfold,et al.  Ion-Selective Microelectrodes: Principles, Design and Application , 1986 .

[4]  A. Covington,et al.  Simultaneous evaluation of electroactive membranes on a four-function isfet by a constant dilution method , 1986 .

[5]  Curtis C. Johnson,et al.  Hydrogen, Calcium, and Potassium Ion-Sensitive FET Transducers: A Preliminary Report , 1978, IEEE Transactions on Biomedical Engineering.

[6]  W. E. Morf,et al.  Anion-selective liquid membrane electrodes based on lipophilic quaternary ammonium compounds , 1984 .

[7]  G. J. Moody,et al.  Nitrate ion selective electrodes based on poly(vinyl chloride) matrix membranes , 1972 .

[8]  Robert J. Huber,et al.  Ion-Sensitive Field Effect Transistors , 1980 .

[9]  Richard P. Buck,et al.  Electrochemistry of Ion-Selective Electrodes , 1981 .

[10]  G. Eisenman,et al.  Glass electrodes for hydrogen and other cations : principles and practice , 1967 .

[11]  P Bergveld,et al.  Development of an ion-sensitive solid-state device for neurophysiological measurements. , 1970, IEEE transactions on bio-medical engineering.

[12]  S D Moss,et al.  Chemically sensitive field-effect transistors. , 1976, Biomedical engineering.

[13]  W. Simon,et al.  Ion specific electrochemical behavior of macrotetrolides in membranes , 1967 .

[14]  Y. Miyahara,et al.  Comparative studies between ion‐selective field effect transistors and ion‐selective electrodes with polymeric membranes , 1991 .

[15]  M. Esashi,et al.  Integrated Micro Multi Ion Sensor Using Field Effect of Semiconductor , 1978, IEEE Transactions on Biomedical Engineering.

[16]  J. Janata,et al.  Miniaturization in analytical, chemistry—a combination of flow injection analysis and ion-sensitive field effect transistors for determination of ph, and potassium and calcium ions , 1980 .

[17]  P. Gehrig,et al.  Neutral-Carrier-Based Ion-Selective Microelectrodes Design and Application , 1988 .

[18]  Jonathan M. Slater,et al.  Modified poly(vinyl chloride) matrix membranes for ion-selective field effect transistor sensors , 1988 .

[19]  F. A. Schultz,et al.  Anion selectivity studies on liquid membrane electrodes , 1973 .

[20]  A. Sibbald,et al.  A miniature flow-through cell with a four-function chemfet integrated circuit for simultaneous measurements of potassium, hydrogen, calcium and sodium ions , 1984 .

[21]  An ISFET-based flow injection analysis system for determination of urea: Experiment and theory , 1990 .

[22]  T. Yu.  Application of Ion-Selective Electrodes in Soil Science , 1985 .

[23]  Elo Harald Hansen,et al.  New nitrate ion-selective electrodes based on quaternary ammonium compounds in nonporous polymer membranes , 1976 .

[24]  Piet Bergveld,et al.  Future Applications of ISFETs , 1991 .

[25]  H. Freiser,et al.  Ion-Selective Electrodes in Analytical Chemistry , 1980 .

[26]  R. Durst.  Ion-selective electrodes : proceedings , 1969 .

[27]  Yuji Miyahara,et al.  Long-life multiple-ISFETS with polymeric gates , 1989 .

[28]  A. Hulanicki,et al.  The effect of the solvent in the nitrate-selective electrode , 1978 .

[29]  Curtis C. Johnson,et al.  Potassium ion-sensitive field effect transistor , 1975 .

[30]  Curtis C. Johnson,et al.  Ion-selective field effect transistors with polymeric membranes , 1978 .

[31]  Jiri Janata,et al.  Field effect transistors sensitive to sodium and ammonium ions , 1981 .

[32]  Malcolm Dole,et al.  THE THEORY OF THE GLASS ELECTRODE , 1931 .

[33]  Hiroyuki Miyagi,et al.  A multiple‐ISFET integrated with CMOS interface circuits , 1988 .

[34]  P. C. Meier.  Two-parameter debye-hückel approximation for the evaluation of mean activity coefficients of 109 electrolytes , 1982 .

[35]  T. Hwang,et al.  Nitrate ion-selective electrodes based on complexes of 2,2'-bipyridine and related compounds as ion exchangers , 1979 .

[36]  P Bergveld,et al.  Development, operation, and application of the ion-sensitive field-effect transistor as a tool for electrophysiology. , 1972, IEEE transactions on bio-medical engineering.

[37]  Michel Steyaert,et al.  Multispecies Integrated Electrochemical Sensors With On-chip CMOS Circuitry , 1985 .

[38]  K. Wise,et al.  An Integrated Field-Effect Electrode for Biopotential Recording , 1974 .

[39]  M. Matsuo.  Biomedical Cation Sensor Using Field Effect of Semiconductor , 1974 .

[40]  Piet Bergveld,et al.  An ISFET-based microlitre titrator: integration of a chemical sensor—actuator system , 1985 .

[41]  W. C. Dahnke.  Use of the nitrate specific ion electrode in soil testing , 1971 .