Quantification of Cadmium in Rice by Surface-enhanced Raman Spectroscopy Based on a Ratiometric Indicator and Conical Holed Enhancing Substrates

A surface-enhanced Raman spectroscopy (SERS) based method was developed for the quantification of Cd2+ in rice. Gold nano-particles (AuNPs) modified with trimercaptotriazine served as a ratiometric SERS probe for the detection of Cd2+. A conical holed substrate was used to further enhance SERS signa...

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Bibliographic Details
Published in:Analytical Sciences 2018/12/10, Vol.34(12), pp.1405-1410
Main Authors: ZUO, Qi, CHEN, Yao, CHEN, Zeng-Ping, YU, Ru-Qin
Format: Article
Language:English
Subjects:
Analytical Chemistry
Cadmium
Calibration
Chemistry
conical holed substrate
Deformation
Gold
Inductively coupled plasma mass spectrometry
Mass spectrometry
Mass spectroscopy
Oryza
Quantitative analysis
Raman spectroscopy
Rice
Spectroscopy
Substrates
Surface-enhanced Raman spectroscopy
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Summary:A surface-enhanced Raman spectroscopy (SERS) based method was developed for the quantification of Cd2+ in rice. Gold nano-particles (AuNPs) modified with trimercaptotriazine served as a ratiometric SERS probe for the detection of Cd2+. A conical holed substrate was used to further enhance SERS signals, and hence to improve the sensitivity. A calibration model based on the spectral shape deformation quantitative theory was employed to mitigate the influence of variations in the number and distribution of “hot spots”. The proposed SERS method was applied to quantitative analysis of Cd2+ in three types of rice, and achieved satisfactory quantitative results with accuracy comparable to that of the reference method—inductively coupled plasma mass spectrometry. The limit of detection of the proposed method was estimated to be 8 μg kg−1. The proposed SERS method has the potential to become a fast screening method for the detection of Cd2+ in rice.
ISSN:0910-6340
1348-2246
DOI:10.2116/analsci.18P342