Electrochemical sensor for detection of europium based on poly-catechol and ion-imprinted sol-gel film modified screen-printed electrode
Electrochemical sensor for detection of europium based on poly-catechol and ion-imprinted sol-gel film modified screen-printed electrode
复制标题
基于聚邻苯二酚和离子印迹溶胶凝胶薄膜修饰丝网印刷电极的铕检测电化学传感器
DOI：
10.1016/j.jelechem.2018.07.015
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发表时间：
2018-09-01
影响因子：
4.5
通讯作者：
Cao, Qiue
中科院分区：
文献类型：
--
作者：
Chen, Jin;Bai, Huiping;Cao, Qiue
由于铕在不同领域的应用越来越广泛，它已成为环境和人类健康的威胁。因此，有必要建立一种简便、快速的测定痕量铕的方法。以聚邻苯二酚为信号放大元件，溶胶-凝胶法制备的Eu（III）离子印迹膜为识别材料，对丝网印刷电极（SPE）进行修饰，建立了测定Eu 3+的传感器。对影响传感器灵敏度的因素进行了详细的优化，采用微分脉冲吸附溶出伏安法（DPASV）可在3.0 × 10 ~（-7）~ 1.0 × 10 ~（-3）mol L ~（-1）范围内测定Eu ~（3+），检出限为1.0 × 10 ~（-7）mol L ~（-1）。该传感器具有良好的选择性、稳定性和再生性。50-稀土离子如Ce ~（3+）、Tb ~（3+）、Ho ~（3+）、Dy ~（3+）、Er ~（3+）、Gd ~（3+）、Pr ~（3+）、Nd ~（3+）、Yb ~（3+）和其它金属离子如Fe ~（3+）、Ni ~（3+）、Cu ~（2+）、Zn ~（2+）、Co ~（2+）等在1.0 × 10 ~（-5）mol·L ~（-1）Eu ~（3+）的测定中，过量100倍的稀土离子和过量100倍的其它金属离子对测定无影响。该传感器用于水样中Eu ~（3+）的测定，相对标准偏差（RSD）< 3.6%（n = 5），回收率在97.6%~ 101.6%之间。
As a result of the increasing applications in different fields, europium has become a threat to the environment and human health. Thus, it is necessary to develop a simple and rapid method for determination of europium in trace level. In this paper, a sensor for determination of Eu3+ was established by modifying a screen printed electrode (SPE) successively with poly catechol as signal amplifying element and Eu(III) ion-imprinted membrane fabricated by sol-gel method as the recognition material. After the factors influenced the sensitivity of the sensor for Eu3+ was optimized in detail, Eu3+ can be determined by differential pulse adsorptive stripping voltammetry (DPASV) in the concentration range of 3.0 x 10(-7)-1.0 x 10(-3) mol L-1 with the detection limit of 1.0 x 10(similar to 7) mol L-1. The fabricated sensor owns outstanding selectivity, perfect stability and good regeneration. 50-fold excess concentration of rare earth ions such as Ce3+, Tb3+, Ho3+, Dy3+, Er3+, Gd3+, Pr3+, Nd3+, Yb3+ and 100-fold excess concentration of other metal ions such as Fe3+, Ni3+, Cu2+, Zn2+ and Co2+ have no influence on the determination of 1.0 x 10(-5) mol L-1 Eu3+. The obtained sensor, which can maintain > 90% of its original response after used > 60 times or stored in the water for 2 months, has been satisfactorily used to detect Eu3+ in water samples with the relative standard deviation (RSD) of < 3.6% (n = 5) and recoveries in the range of 97.6%-101.6%.