Investigations of Hg(II) analysis in real samples via computational chemistry, experimental design, and green microextraction approach

An economical and green nanostructured supramolecular solvent-based ultrasound-assisted homogeneous liquidliquid microextraction procedure was developed to separate and preconcentrate Hg(II) ions in water and vegetable samples in the presented article. The interactions between chemical species were investigated using computational chemistry. The experimental design was used to optimize critical variables influencing the separation of Hg(II). Under optimum conditions (pH = 6.4; the volume of supramolecular, 170 mu L; the amount of ligand, 14 mmol L-1; extraction temperature, 35 degrees C), the linearity was in the range of 1-450 mu g L-1. The procedure has an enrichment factor of 82 with a detection limit of 0.33 mu g L-1. In addition, repeatability and reproducibility precisions for 10, 100, and 300 mu g L-1 of Hg(II) were in the range of 1.8-3.4 % and 2.5-4.4 %, respectively. The accuracy was tested by analyzing certified reference materials and then successfully applied for the pre-concentration and determination of Hg(II) ions in the selected samples with relative recovery.

Automated summary

An economical and green nanostructured supramolecular solvent-based ultrasound-assisted homogeneous liquid-liquid microextraction procedure with high enrichment factor and low detection limit was developed for the preconcentration and determination of Hg(II) ions in water and vegetable samples.