For the extraction of Cd, the pH value was in the range of neutral or weak acidity, which was different from some conventional works in alkaline solution. The different color of solution induced by this reason led to a different maximum absorption wavelength, which could be one of the key factors contributed to the high sensitivity and enhancement factor. From the figure, the preliminary enhancement of sensitivity was obvious, and the maximum absorption wavelengths after DLLME were basically in accordance with the values without DLLME