Solidification floating organic drop for dispersive liquid–liquid microextraction estimation of copper in different water samples

Abstract A selective, sensitive, and eco-friendly microextraction method followed by the solidified floating organic drop-dispersive liquid–liquid microextraction was investigated to determine copper( ii ) ions by spectrophotometry. The developed method depends on forming a colored complex between copper ion and 2-aminophenol with a maximum absorbance at a maximum absorption wavelength of 440 nm. This enables the estimation of copper ions in different water samples by direct spectrophotometry. The key factors that influence the stability of the colored association complex and the performance of the extractive method were studied and optimized. A quantitative range of 10–75 µg·L −1 of copper was detected. The calibration equation was determined and found to have a slope of 0.0141 and an intercept of 0.0382. The limit of detection was 3.0 µg·L −1 , while the limit of quantification was 9.3 µg·L −1 . The relative standard deviation ( n = 3) was evaluated to be 0.62%. Common ion interference effects were investigated, and the method was fairly selective. The proposed method was applied practically for the estimation of copper levels in common water samples. The reliability and accuracy of the developed method were proved by the analysis of different types of water samples.