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An optical sensor for mercuric ion based on immobilization of Rhodamine B derivative in PVC membrane

Author:
Ling, Lixin, Zhao, Yan, Du, Juan, Xiao, Dan
Source:
Talanta 2012 v.91 pp. 65-71
ISSN:
0039-9140
Subject:
cations, detection limit, fish, fluorescence, mercury, sensors (equipment), streams
Abstract:
A novel prepared mercuric ion PVC membrane sensor based on a Rhodamine B derivative (RND) as a selective sensing material was described. The sensor exhibited a specific fluorescent off-on response to Hg²⁺, and showed a linear response over the Hg²⁺ concentration range from 1.0×10⁻⁹ to 2.0×10⁻³M with a very low detection limit of 8.1×10⁻¹⁰M in bulk method. The sensor has also been incorporated into a flow-cell for determination of Hg²⁺ in flowing streams with improved sensitivity and detection limit. The sensor shows excellent selectivity toward Hg²⁺ with respect to common coexisting cations. The proposed fluorescence optode was successfully applied to detect Hg²⁺ in environmental water samples and fish.
Agid:
1091813