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Abstract A novel method for the simple, selective separation and trace determination of cadmium is presented. Cadmium is extracted quantitatively at a pH value of 9.5 using 7‐hydroxy‐4‐methylcoumarin hydroxyl amine (HMCHA) in dichloromethane, exhibiting maximum absorbance at 400 nm with a molar absorptivity ( ε ) of 5.0 × 10 4 L mol −1 cm −1 and conforming to Beer's law within the concentration range of 0.1 to 5.0 ppm. The Cd‐HMCHA complex displays a characteristic yellowish‐pink coloration. Determination of cadmium is accomplished via spectrophotometry and inductively coupled plasma mass spectrometry, resulting in a sensitivity enhancement of 20‐fold which has a limit of detection of 1.950 ppb and a limit of quantification of 5.850 ppb. The extraction of cadmium is not affected by other ions, showing not any interference. The efficacy of this method is validated through the analysis of cadmium in National Bureau of Standard Samples.
Jadvani et al. (Sat,) studied this question.