An Integrated Screen-Printed Potentiometric Strip for Determination of Ca2+ in Seawater. Issue 8 (1st January 2019)

• Record Type: Journal Article
• Authors: Yin, Tanji; Yu, Han; Ding, Jiawang; Qin, Wei
• Is Part Of: Journal of the Electrochemical Society. Volume 166:Issue 8(2019)
• Page Start: B589
• Page End: B593
• Publication Date: 2019-01-01
• Subjects: Sensors -- All-solid-state indicator electrode -- Electrochemical pretreatment -- Screen-printed potentiometric strip; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0251908jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : The detection of Ca 2+ in seawater is of critical importance to understand the growth of marine organisms and the circulation of the ocean ecosystem. This paper reports an integrated screen-printed potentiometric strip based on an all-solid-state Ca 2+ -selective polymeric membrane indicator electrode and an all-solid-state reference electrode for determination of Ca 2+ in seawater, for which the conductive carbon ink-based substrate was pretreated by the physical and electrochemical methods. The proposed pretreatment procedures are found to improve the electro-transfer kinetics, decrease the electron-transfer resistances and increase the double layer capacitance of the screen-printed carbon electrode, which are favorable for constructing the all-solid-state Ca 2+ -ISEs without the additional materials as solid contacts. The proposed screen-printed potentiometric strip shows a stable linear potential response in the range of 1.0 × 10 −5 − 0.1 M with a slope of 26.7 ±1.3 mV/dec ( n = 3) in the presence of 0.5 M NaCl. Additionally, the prepared potentiometric strip was used to investigate the vertical distributions of Ca 2+ in seawater, and the results are consistent with those by inductively coupled plasma-optical emission spectrometry. This work indicates that the proposed potentiometric strip can be used as an alternative tool for on-site and rapid detection of Ca 2+ for marine monitoring.