Satoh Hisashi, Miyazaki Yuji, Taniuchi Shou, Oshiki Mamoru, Rathnayake Rathnayake M L D, Takahashi Masahiro, Okabe Satoshi
Division of Environmental Engineering, Faculty of Engineering, Hokkaido University.
Department of Civil Engineering, National Institute of Technology, Nagaoka College.
Anal Sci. 2017;33(7):825-830. doi: 10.2116/analsci.33.825.
An ionophore-doped sensing membrane phosphate (PO) 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 (HPO) concentration of 0.5 μM (corresponding to 1.0 μM of orthophosphate at pH 7.2), whereas the detection limit of PO-microsensors based on trialkyl/aryltin chloride was 50 μM of HPO. The Bis microsensor showed excellent selectivity for HPO against nitrite, nitrate, chloride, bicarbonate and sulfate, as compared with PO 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 PO 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.
本文描述了一种基于双（二溴苯基锡基）甲烷的离子载体掺杂传感膜磷酸盐（PO）微传感器（双微传感器）。双微传感器呈现能斯特响应。双微传感器的响应在磷酸氢根离子（HPO）浓度低至0.5 μM（在pH 7.2时相当于1.0 μM正磷酸盐）时呈对数线性，而基于三烷基/芳基氯化锡的PO微传感器的检测限为50 μM HPO。与基于三烷基/芳基氯化锡的PO微传感器相比，双微传感器对HPO具有出色的选择性，对亚硝酸盐、硝酸盐、氯离子、碳酸氢根和硫酸根具有抗干扰能力。已知溶解氧会干扰先前开发的基于钴的电位型固态PO微传感器的响应，但对本文所述的离子载体掺杂传感膜型微传感器的响应没有影响。只有OH（即pH）会干扰离子载体掺杂传感膜型微传感器。
