A novel cyanide ion sensing approach based on Raman scattering for the detection of environmental cyanides

This paper describes a direct optical approach based on Raman scattering for selective and sensitive detection of cyanide ions in aqueous environment without requiring time-consuming sample pretreatment and the formation of hydrogen cyanide. Due to the strong affinity between copper (I) and cyanide...

Full description

Saved in:
Bibliographic Details
Published in:Ecotoxicology and environmental safety 2010-09, Vol.73 (6), p.1490-1494
Main Authors: Yan, Fei, Gopal Reddy, C.V., Zhang, Yan, Vo-Dinh, Tuan
Format: Article
Language:English
Subjects:
Assessments
Copper
Copper (I) iodide
Copper - chemistry
Cyanides
Cyanides - analysis
Environmental cyanide
Evaporation
Iodides - chemistry
Limit of Detection
Linearity
Matrices
Nitrogen dioxide
On-site Monitoring
Raman scattering
Spectrum Analysis, Raman - methods
Thin films
Water Pollutants, Chemical - analysis
Water Supply - standards
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper describes a direct optical approach based on Raman scattering for selective and sensitive detection of cyanide ions in aqueous environment without requiring time-consuming sample pretreatment and the formation of hydrogen cyanide. Due to the strong affinity between copper (I) and cyanide ion, evaporated copper (I) iodide (CuI) thin films are shown to be excellent substrates for selective recognition of free cyanide ions in aqueous matrices. The amount of cyanide ion retained by the copper (I) in the CuI thin films reflects its actual concentration in tested samples, and the subsequent Raman measurements of the substrate are shown to be capable of detecting toxic cyanide content at levels under international drinking water standard and environmental regulatory concentrations. Measurements obtained from the same batch of evaporated CuI thin films (∼100-nm thickness) show excellent linearity over a variety of cyanide concentrations ranging from 1.5μM to 0.15mM. This detection method offers the advantage of selectively detecting cyanides causing a health hazard while avoiding detection of other common interfering anions such as Cl−, Br−, PO43−, SO42−, NO2−, S2− and SCN−. Coupled with portable Raman systems that are commercially available, our detection approach will provide on-site monitoring capability with little sample preparation or instrument supervision, which will greatly expedite the assessment of potential environmental cyanide risks.
ISSN:0147-6513
1090-2414
DOI:10.1016/j.ecoenv.2010.02.018