One-step effervescence tablet-assisted switchable hydrophilic solvent microextraction combined with micro spectrophotometry for the determination of copper in Salvia yunnanensis and environmental samples

The current work combined one-step effervescence tablet-assisted switchable hydrophilic solvent microextraction with micro UV-Vis spectrophotometry and established a simple and sensitive method for the determination of copper in natural medicine Salvia yunnanensis and environmental samples (water and soil).