Trace Determination of Arsenite with an Ionophore-Coated Selective Micro Sensor

Li Wang, Wenshuai Lu, Gaoshan Jing, Tianhong Cui

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Pages (from-to)4364-4371
Number of pages8
JournalIEEE Sensors Journal
Volume18
Issue number11
DOIs
StatePublished - Jun 1 2018

Fingerprint

Ionophores
sensors
Sensors
Ion selective membranes
membranes
selectivity
anodic stripping
interference
waste water
ions
environmental monitoring
background noise
Voltammetry
statistical analysis
standard deviation
Statistical methods
Wastewater
Gold
gold
Membranes

Keywords

  • Anodic stripping voltammetry (ASV)
  • arsenite determination
  • chemical sensor
  • ionophore

Cite this

Trace Determination of Arsenite with an Ionophore-Coated Selective Micro Sensor. / Wang, Li; Lu, Wenshuai; Jing, Gaoshan; Cui, Tianhong.

In: IEEE Sensors Journal, Vol. 18, No. 11, 01.06.2018, p. 4364-4371.

Research output: Contribution to journalArticle

Wang, Li ; Lu, Wenshuai ; Jing, Gaoshan ; Cui, Tianhong. / Trace Determination of Arsenite with an Ionophore-Coated Selective Micro Sensor. In: IEEE Sensors Journal. 2018 ; Vol. 18, No. 11. pp. 4364-4371.
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