This paper reports a highly sensitive micro sensor utilizing an ion selective membrane to determine trace arsenite with anodic stripping voltammetry in the presence of interferences. The sensor was fabricated by depositing an arsenite (As (III)) ion selective membrane on a gold electrode surface. Compared with the traditional sensor without an ionophore membrane, the proposed sensor achieved better voltammetric performance due to its superior selectivity to As (III). After applying the ionophore film, the sensor's background current decreased from 1.375μA to 0.320μA, and its standard deviation decreased from 0.150μA to 0.007μA, leading to lower background noise and higher conformity. Meanwhile, the sensor demonstrated high selectivity with the existence of interference ions, such as Cd2+, Pb2+, and Hg2+. The detection and statistical analysis of As (III) were performed in the linear concentration range of 10-100 ppb (R2 = 0.993) and a low limit of detection (LOD) of 1.10 ppb was obtained for 300s deposition. The sensor was successfully employed for the determination of As (III) in waste water and the results were in good agreement with those from a standard procedure. This highly sensitive and selective portable sensor holds great potential for on-line environmental monitoring.
Bibliographical noteFunding Information:
Manuscript received February 17, 2018; accepted March 29, 2018. Date of publication April 10, 2018; date of current version May 9, 2018. This work was supported in part by Dongshan Coal Electricity Group Co. Ltd. The associate editor coordinating the review of this paper and approving it for publication was Dr. Chang-Soo Kim. (Corresponding author: Tianhong Cui.) L. Wang and G. Jing are with the Department of Precision Instrument, Tsinghua University, Beijing 100084, China (e-mail: l-w13@ mails.tsinghua.edu.cn; firstname.lastname@example.org).
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- Anodic stripping voltammetry (ASV)
- arsenite determination
- chemical sensor