Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1245961 | Talanta | 2007 | 7 Pages |
Abstract
In this paper, it was found that the hydrophobic ion-associated complex of the molybdophosphoric heteropoly acid with protonated butyl-rhodamine B (BRhB) could be formed and was further selectively extracted into the bulk of the paraffin oil-based carbon paste electrode (CPE). At the same time, compared with other modifiers, the benzene-modified CPE created a suitable electrochemiluminescence (ECL) reaction microenvironment for electro-oxidation BRhB to produce the stronger ECL signal when a 1.30 V electrolytic potential was applied to the CPE in the alkaline medium. Based on these findings, a selective and sensitive ECL method for indirectly detecting phosphate was developed. Under the optimum experimental conditions, the ECL intensity was linear with the concentration of phosphate in the range of 2.0 Ã 10â10 to 1.0 Ã 10â8 g mLâ1. The detection limit was 8.0 Ã 10â11 g mLâ1. The proposed method has been applied successfully to the analysis of phosphate in the water samples.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Yan Xue, Xingwang Zheng, Guixin Li,