Notice of RetractionFluorescence quenching of o-methoxyl tetraphenylporphyrin for determination of trace cadmium in waste water

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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A fluorescence spectrophotometry based on o-methoxyl tetraphenylporphyrin (o-OCH₃TPP) for analysis of trace amount of cadmium ion in environmental waste water with a high sensitivity and high selectivity bas been discussed in this paper. When the optimal concentration of the porphyrin was fixed as 5.0×10^-5mol/L and the optimal pH value was adjusted to 8.81 using Tris-HCl-tetrahydrofuran buffer solution, the fluorescence extinction value was proportional to the logarithmic value of Cd²⁺ concentration with the range of 5.0×10^-8 to 1.0×10^-6 mol/L, and the correlation coefficient was 0.9974 (n=10). The detection limit for Cd²⁺ could be evaluated to be 4.07×10^-8mol/L. In addition, no obvious interferences from some common metal ions were observed. Also, the presented fluorescence spectrophotometry possessed a very nice reproducibility and stability with a recovery rate of 98.20%~102.00%, indicating that it was of feasibility for determination of trace amount of Cd²⁺ in environmental waste water.