Abstract
Perchlorate (ClO4-) has aroused wide concern as a global ecosystem pollutant, especially in the aquatic environment. A rapid and visible detection of ClO4- in aqueous solution using alkali methylene blue (MB) and liquid-liquid extraction (LLE) was established with high selectivity and sensitivity. The alkali MB exclusively change from red into blue in an organic solvent when exposed to aqueous ClO4-. The organic solvent, amount of MB and the alkalinity of the solution were systematically optimized, while the underlying mechanism was revealed using UV-Vis spectroscopy and mass spectrometry. Under the optimum conditions, the UV-Vis absorbance at 600nm showed a good linear relationship with the concentrations of ClO4- in the range of 0.0025-0.025mM (R2 = 0.9945). The visual detection limit was 0.005mM in environmental water and 0.02mM in black tea infusion. This method provides an economical and simple visual detection of ClO4- in an aqueous solution.
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