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Title: Light addressable photoelectrochemical cyanide sensor

A sensor is demonstrated that is capable of spatial discrimination of cyanide with use of only a single stationary sensing element. Different spatial regions of the sensing element are light activated to reveal the solution cyanide concentration only at the point of illumination. In this light addressable photoelectrochemical (LAP) sensor the sensing element consists of an n-CdSe electrode immersed in solution, with the open-circuit potential determined under illumination. In alkaline ferro-ferri-cyanide solution, the open-circuit photopotential is highly responsive to cyanide, with a linear response of (120 mV) log [KCN]. LAP detection with a spatial resolution of {+-}1 mm for cyanide detection is demonstrated. The response is almost linear for 0.001-0.100 m cyanide with a resolution of 5 mV. 38 refs., 7 figs., 1 tab.
Authors:
; ;  [1]
  1. Clark Univ., Worcester, MA (United States)
Publication Date:
OSTI Identifier:
249633
Resource Type:
Journal Article
Resource Relation:
Journal Name: Analytical Chemistry (Washington); Journal Volume: 68; Journal Issue: 6; Other Information: PBD: 15 Mar 1996
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; 36 MATERIALS SCIENCE; 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; PHOTOELECTROCHEMICAL CELLS; USES; CYANIDES; QUANTITATIVE CHEMICAL ANALYSIS; IRON COMPOUNDS; MEASURING INSTRUMENTS; CADMIUM SELENIDES; SOLUTIONS; PHOTOCURRENTS