Atomic Absorption Spectrometric Determination of Trace Amount of Rhodium by Using Ligandless Dispersive Liquid-Liquid Microextraction Based on Solidification of Floating Organic Droplet

In this article, ligandless dispersive liquid–liquid microextraction based on the solidification of floating organic drop was used as a sample preparation method prior to flame atomic absorption determi nation trace amount of rhodium in standard and dust samples. Several factors that may be affected on the extraction process, such as extraction and disperser solvent, the volume of extraction and disperser solvent, effect of salt, pH of the aqueous solution and extraction time were optimized. Under the best experimental conditions, the calibration curve exhibited linearity over the range of 10.0 ng mL^-1- 3.7 μg mL^-1with a correlation coefficient of 0.9992 and detection limit was 1.5 ng mL^−1 based on 3Sb. Eight replicate determination of 1.0 μg mL^-1 rhodium gave a mean absorbance of 0.255 with relative standard deviation of ±1.7%. Finally, the developed method was successfully applied to extraction and determination of the rhodium ions in the dust and standard samples and satisfactory results were obtained.