title: Direct Electrochemical Detection of Bisphenol A Using a Highly Conductive Graphite Nanoparticle Film Electrode.
abstract: We developed an accurate and sensitive sensor for electrochemical detection of bisphenol A (BPA) with a high-conductivity graphite nanoparticle (GN) film electrode. The GNs consisted of several stacked graphene sheets and showed a homogenous spherical shape, high conductivity, large surface area and good adsorption properties to BPA. The constructed GN film electrode exhibited improved amperometric current responses such as decreased impedance and lowered BPA oxidation potential compared with those of a pristine electrode, and also possessed a large surface area to allow fast electron transfer and BPA accumulation. A pre-accumulation process with BPA adsorption resulted in considerable current signal enhancement during BPA detection. The loading amount of GNs on the film electrode and the time for target BPA enrichment were optimized. The GN film electrode-based sensor showed high reproducibility and high selectivity for BPA over other reagents. Differential pulse voltammetry experiments revealed that the concentrations of BPA were linearly correlated with the current changes, and the lowest limit of detection of the sensor was 35 nM. Furthermore, the sensor showed great accuracy and reliability, as confirmed by high-performance liquid chromatography measurements. The sensor was also successfully used for BPA determination in groundwater samples, demonstrating its potential for real environmental analysis.
authors.affiliation: Key Laboratory of Ground Water Resources and Environment of the Ministry of Education, College of Environment and Resources, Jilin University, 2519 Jiefang Road, Changchun 130021, China. dongxw14@mails.jlu.edu.cn.
authors.forename: Xinwei
authors.initials: X
authors.lastname: Dong
authors.affiliation: Key Laboratory of Ground Water Resources and Environment of the Ministry of Education, College of Environment and Resources, Jilin University, 2519 Jiefang Road, Changchun 130021, China. qixl15@mails.jlu.edu.cn.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Qi
authors.affiliation: Key Laboratory of Ground Water Resources and Environment of the Ministry of Education, College of Environment and Resources, Jilin University, 2519 Jiefang Road, Changchun 130021, China. liuna@jlu.edu.cn.
authors.forename: Na
authors.initials: N
authors.lastname: Liu
authors.affiliation: Key Laboratory of Ground Water Resources and Environment of the Ministry of Education, College of Environment and Resources, Jilin University, 2519 Jiefang Road, Changchun 130021, China. YangYuesuo@jlu.edu.cn.|Key Laboratory of Eco-restoration of Regional Contaminated Environment, Shenyang University, Shenyang 110044, China. YangYuesuo@jlu.edu.cn.
authors.forename: Yuesuo
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Key Laboratory of Ground Water Resources and Environment of the Ministry of Education, College of Environment and Resources, Jilin University, 2519 Jiefang Road, Changchun 130021, China. yxpiao@jlu.edu.cn.
authors.forename: Yunxian
authors.initials: Y
authors.lastname: Piao
keywords: Bisphenol A; adsorption; electrochemical oxidation; graphite nanoparticle