Notice of RetractionOnline Automatic Monitoring of Trace Amounts of Zinc in Environmental 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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It is found that in pH 9.3 buffer solutions, zinc (II) reacts with 1-(2-pyridineazo)-2-naphtho to form a water-soluble complex of Zn (II)-1-(2-pyridineazo)-2-naphtho at the presence of Tween-80. Based on this, a simple and sensitive flow injection spectrophotometric method was proposed for online automatic monitoring of trace amounts of zinc in environmental water. Beer´s law was obeyed in the concentration range of 2.0 μg/L ~ 360.0 μg/L for zinc (II) and the detection limit calculated from three times of background noise was 0.42 μg/L. The relative standard deviation was 3.6% and 2.1% for 5.0 μg/L and 50.0 μg/L of zinc standard solution, respectively (n=8). The proposed method had good selectivity (No ions interfered with the determination of zinc (II) except the ions of Ni²⁺, Cd²⁺, Mn²⁺, Pb²⁺, Fe²⁺ and Cu²⁺, which interference was eliminated by adding sodium hexametaphosphate, o-phenanthroline, and sodium diethyldithiocarbamate as appropriate masking reagents). The method had been successfully applied to online automatic monitoring of trace amounts of zinc in environmental water and the analytical results were satisfactory.