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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.19 [2012] >
IJCT Vol.19(6) [November 2012] >
| Title: | Three-dimensional nano-structured silver on gold interdigitated microband array electrode for nitrate determination |
| Authors: | Hu, Jingfang
Sun, Jizhou
Bian, Chao
Tong, Jianhua
Zia, Shanhong |
| Keywords: | 3D nano-structured silver
Interdigitated microband array electrode
Micro-electro-mechanical systems
Nitrate determination |
| Issue Date: | Nov-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | A new type of micro amperometric sensing chip based on gold interdigitated
microband array (Au-IDA) electrode for trace nitrate determination has been
developed. The Au-IDA microelectrode is fabricated with
micro-electro-mechanical systems technology. Three-dimensional (3D) nano-structured dendritic silver is electrochemically
deposited on the Au-IDA microelectrode surface, which shows superior
electrocatalysis property in facilitating nitrate reduction. The results show
that the sensing chip has a sensitivity of 9.5 nA/μmol/L, limit of detection of 10 μmol/L, detection
dynamic range of
10-1000 μmol/L , and linear
range of 25-1000 μmol/L nitrate (R2=0.9998).
Interference analysis with 9 kinds of ions (NO2−, F−, PO43−,
H2PO4−, SO42−,
CO32−, NH4+, Na+ and K+)
commonly found in surface water indicates that the proposed microchips have
good selectivity to NO3−. It is noteworthy that the proposed 3D nano-structured dendritic silver
modified Au-IDA microelectrode could be used for nitrate analysis in neutral
media which is important for field and real-time monitoring nitrate ions in
natural water.
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| Page(s): | 414-419 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.19(6) [November 2012]
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