Fig xA UV ndash vis absorption spectra

The linear range was at least 0–1.40 μM with a correlation coefficient of R2 = 0.9919 (n = 3), and the detection limit of L for Mg2+ was evaluated to be as low as 2.28 × 10−8 mol/L in ethanol solution, which is low for the detection of Mg2+ ions found in many chemical systems [4] and [8].