共 44 条
Alternative coulometric signal readout based on a solid-contact ion-selective electrode for detection of nitrate
被引:28
作者:
Wang, Hemin
[1
,2
]
Yuan, Baiqing
[1
]
Yin, Tanji
[2
,3
,4
]
Qin, Wei
[2
,3
,4
]
机构:
[1] Ludong Univ, Sch Chem & Mat Sci, Yantai 264025, Shandong, Peoples R China
[2] Chinese Acad Sci, Shandong Prov Key Lab Coastal Environm Processes, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai Inst Coastal Zone Res YIC,YICCAS, Yantai 264003, Shandong, Peoples R China
[3] Pilot Natl Lab Marine Sci & Technol, Lab Marine Biol & Biotechnol, Qingdao 26620, Peoples R China
[4] Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Shandong, Peoples R China
基金:
中国国家自然科学基金;
关键词:
Coulometric signal;
Solid-contact ion-selective electrode;
Electrical double layer capacitance;
Ordered mesoporous carbon;
NO3-;
MEMBRANE ELECTRODES;
CARBON-BLACK;
NITRITE;
GRAPHENE;
MICROSENSOR;
REDUCTION;
SENSORS;
WATER;
D O I:
10.1016/j.aca.2020.07.019
中图分类号:
O65 [分析化学];
学科分类号:
070302 ;
081704 ;
摘要:
Traditional potentiometric NO3--selective electrodes suffer from a fundamental limitation of the Nernst slope (59.1 mV/dec at 25 degrees C) due to the relationship between the potential and the logarithmic of ionic activity. Herein, a coulometric signal readout is proposed instead of the potentiometric response for detection of NCii based on an ordered mesoporous carbon (OMC)-based solid-contact ion-selective electrode (ISE). The mechanism for obtaining the coulometric signal is based on the electrical double layer capacitance of OMC compensating the potential change at the ion-selective membrane/solution interface during the measurements under the control of a constant applied potential. Under the optimized conditions, the coulometric signal for the OMC-based solid-contact NO3--ISE shows two linear responses in the activity range of 1.0 x 10(-6)-8.0 x 10(-6) M and 8.0 x 10(-6)-8.0 x 10(-4) M, and the detection limit is 4.0 x 10(-7) M (3 sigma/s). The proposed coulometric response also shows excellent reproducibility and stability in the presence of O-2 and CO2 and light on/off. Additionally, the coulometric response shows acceptable and reliable results for detection of NO3- in mineral water as compared to the traditional potentiometric response and the ion chromatography. This work provides a promising alternative signal readout for detection of ions by using solid-contact ion-selective electrodes. (C) 2020 Elsevier B.V. All rights reserved.
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页码:136 / 142
页数:7
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