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7112418 
Journal Article 
An All-Solid-State Silicate Ion-Selective Electrode Using PbSiO3 as a Sensitive Membrane 
Wu, R; Chen, X; Tao, C; Huang, Y; Ye, Y; Wang, Q; Zhou, Y; Jin, Q; Cai, Wei; , 
2019 
1 
Sensors
ISSN: 1424-8220 
MDPI 
BASEL 
English 
30691210 
WOS:000459941200088 
Ion-Selective Electrode (ISE) is an emerging technology for in situ monitoring of the chemical concentrations of an aqueous environment. In this work, we reported a novel all-solid-state silicate ISE, using an Ag/Pb/PbSiO3 electrode. This electrode responded to aqueous SiO32- with a reasonable slope of -31.34 mV/decade and a good reproductivity. The linear range covered from 10(-5) M to 10(-1) M, for the Na2SiO3 solutions and the response time was generally less than 5 s. Its potentiometric response to pH and silicate indicated that the prepared electrode was sensitive to silicate, rather than pH. Compared to the traditional liquid ISE, our all-solid-state silicate electrode was resistant to high pressure and could be used in situ, in deep water. In addition, the miniaturized electrodes (diameter of 0.4 mm and a length of 2-3 cm) could be easily integrated into a multi-modal sensor, which could simultaneously determine multiple parameters. Our prepared silicate ISE could potentially be used to determine the presence of silicate in a low-chloride aqueous environment, where the ISE exhibited better selectivity for silicate, over interfering ions such as, SO42-, NO3-, CH3COO-, CO32-, and PO43-.