Determination of Silver in Human Hair by Ionic Liquid‐based Cold‐induced Aggregation Microextraction as a Solvent Extraction Method

Abstract

We report on the determination of silver ion in human hair sample using ionic liquid cold-induced aggregation combined with spectrophotometric detection. Parameters governing the extraction efficiency (such as concentration of ligand, volume of ionic liquid, pH, temperature, extraction time) were optimized and resulted in enrichment factor of 44.4 for silver ion. The calibration curve was linear with correlation coefficient (R 2 ) of 0.999, in the concentration range from 1.0 to 20 ng mL -1 . The relative standard deviation is 2.3% (for n = 10), the limit of detection is 0.262 ng mL -1 , and relative recoveries in real samples were more than 93%.

Thermodynamics Study on Extraction of Silver in Hydrophobic Room-Temperature Ionic Liquid

“…Ionic liquid is very suitable to be used as a solvent for separation and purification due to its unique physical and chemical properties. The domestic and oversea scholars have used this method to carry out related research studies. − Wei et al studied the method of liquid–liquid extraction of metal ions using the [C 4 mim][PF 6 ] as solvent. This is obvious that under the condition of high acidity, the extraction effect of ionic liquid is better than that of chloroform, and the method can be popularized in industry .…”