An Ion-selective Electrode for Anion Perchlorate in Thick-film Technology

Sensors

Mar໚ Jesús Segui²  Josefa Lizondo-Sabater²  Ramon Martínez-Má༞z²  Félix Sancenon²  Juan Soto²  Eduardo Garcia-Breijo¹ 

[1] Instituto de Química Molecular Aplicada, Departamento de Ingeniería Electrónica, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022-Valencia, Spain E-mail:;Instituto de Química Molecular Aplicada, Departamento de Quimica, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022-Valencia, Spain E-mail:

关键词: ion-selective electrodes;    perchlorate;    thick-film;   

DOI  :  10.3390/s6050480

来源: mdpi

【 摘 要 】

The ionophore 1,4,7,10,13-penta(n-octyl)-1,4,7,10,13-pentaazacyclopentadecane (L¹) was used for the development of miniaturised perchlorate-selective electrodes in thick-film technology. Different PVC membranes containing L¹ and the plasticizers o-nitrophenyl octyl ether (NPOE), dibutyl phthalate (DBP), bis(2-ethylhexyl)sebacate (DOS) and dibutyl sebacate (DBS) were prepared and placed on a graphite working electrode manufactured by using thick film serigraphic technology. The perchlorate selective electrode containing DBS as plasticizer showed a potentiometric Nernstian response of -57 mV per decade in a range of perchlorate concentration from 1 × 10^-4 to 1 × 10^-1 M with a detection limit of 5 × 10^-5 M. The ion selective electrodes containing DBP and NPOE as plasticizers exhibit a working range from 6.3 × 10^-5 to 1 × 10^-1 M and 7.4 × 10^-5 to 1 × 10^-1 M for perchlorate, respectively, with a detection limit of ca. 2.2 × 10^-5 M. For all three electrodes a response time of ca. 5 s was found. The prepared electrodes do not show appreciable decay of the slope for at least 25 days. Potentiometric selectivity coefficients (log K^pot_ClO4^-_,X^-) with respect to the primary anion perchlorate were evaluated using the fixed interference method. These coefficients are of the order of 10^-1.7 or smaller, indicating the relatively poor interference of the different anions studied.

【 授权许可】

Unknown   
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