Improvement of a Phosphate Ion-selective Microsensor Using Bis(dibromophenylstannyl)methane as a Carrier

Hisashi Satoh; Yuji Miyazaki; Shou Taniuchi; Mamoru Oshiki; Rathnayake M L D Rathnayake; Masahiro Takahashi; Satoshi Okabe

doi:10.2116/analsci.33.825

Improvement of a Phosphate Ion-selective Microsensor Using Bis(dibromophenylstannyl)methane as a Carrier

Anal Sci. 2017;33(7):825-830. doi: 10.2116/analsci.33.825.

Authors

Hisashi Satoh¹, Yuji Miyazaki¹, Shou Taniuchi¹, Mamoru Oshiki², Rathnayake M L D Rathnayake³, Masahiro Takahashi¹, Satoshi Okabe¹

Affiliations

¹ Division of Environmental Engineering, Faculty of Engineering, Hokkaido University.
² Department of Civil Engineering, National Institute of Technology, Nagaoka College.
³ Department of Civil Engineering, Faculty of Engineering, University of Peradeniya.

PMID: 28690261
DOI: 10.2116/analsci.33.825

Abstract

An ionophore-doped sensing membrane phosphate (PO₄) microsensor based on bis(dibromophenylstannyl)methane (Bis microsensor) is described. The Bis microsensor showed a Nernstian response. The response of the Bis microsensor was log-linear down to a monohydrogen phosphate ion (HPO₄^2-) concentration of 0.5 μM (corresponding to 1.0 μM of orthophosphate at pH 7.2), whereas the detection limit of PO₄-microsensors based on trialkyl/aryltin chloride was 50 μM of HPO₄^2-. The Bis microsensor showed excellent selectivity for HPO₄^2- against nitrite, nitrate, chloride, bicarbonate and sulfate, as compared with PO₄ microsensors based on trialkyl/aryltin chloride. Dissolved oxygen, which is known to interfere with the response of a previously developed cobalt-based potentiometric solid-state PO₄ microsensor, had no effect on the response of the ionophore-doped sensing membrane-type microsensors described herein. Only OH^- (i.e., pH) interfered with the ionophore-doped sensing membrane-type microsensors.

Keywords: Phosphate microsensor; bis(dibromophenylstannyl)methane; ionophore-doped sensing membrane; tip diameter.