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Detecting Arsenic In Groundwater Using Nanostructures

技术优势: High sensitivityPortableDisposableEasily preparedReadily used in-fieldDistinguishes between As(V) and As(III) species

*Abstract: The presence of Arsenic (As) in groundwater, even at low levels, is a significant public health problem -- especially in economically undeveloped regions. However, methods for detecting this toxin in groundwater are problematic because they are not sensitive enough to detect low levels of As, not conducive to fast in-field detection, and/or cost-prohibitive (particularly for poor regions).

To address this international problem, researchers at UC Berkeley have developed an improved method for detecting As in groundwater as low as 1.8 parts per billion. This new sensor method is based on surface-enhanced Raman spectroscopy (SERS), in which analyte molecules near nanostructured metallic surfaces exhibit huge enhancements in Raman scattering. The Berkeley approach is a refinement of this SERS technology. Whereas previous attempts to use SERS to detect As have reported low sensitivities and poor signal-to-noise rations, this novel SERS-based approach achieved toxin detection levels of parts per billion.

In addition to being highly sensitive, this innovative approach is portable, disposable, easily prepared and readily can be used for in-field applications. The sensor also has the unique ability to distinguish between the As(V) and As(III) ionic species.

*Principal Investigation: Name: John Arnold
Department:

Name: Martin Mulvihill
Department:

Name: Prasert Sinsermsuksakul
Department:

Name: Andrea Tao
Department:

Name: Peidong Yang
Department:

附加资料: Patent Number: US20090225310A1
Application Number: US2009372672A
Inventor: Yang, Peidong | Mulvihill, Martin | Tao, Andrea R. | Sinsermsuksakul, Prasert | Arnold, John
Priority Date: 28 Jul 2003
Priority Number: US20090225310A1
Application Date: 17 Feb 2009
Publication Date: 10 Sep 2009
IPC Current: G01J000344
US Class: 356301 | 977700
Assignee Applicant: The Regents of the University of California
Title: SURFACE-ENHANCED RAMAN SPECTROSCOPY SUBSTRATE FOR ARSENIC SENSING IN GROUNDWATER
Usefulness: SURFACE-ENHANCED RAMAN SPECTROSCOPY SUBSTRATE FOR ARSENIC SENSING IN GROUNDWATER
Novelty: Surface-enhanced Raman spectroscopy sensor for sensing arsenic in groundwater, has substrate comprising high-density monolayer of polyhedral silver nanocrystals, where each nanocrystal comprises layer of polyvinypyrrolidone on surface

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