No abstract

In this investigation, folic acid has been used as an efficient and green sorbent in dispersive solid phase extraction for the extraction of di(2-ethylhexyl) adipate and three phthalate esters from the plastic-packed liquids before their determination with gas chromatography-flame ionization detection. This is the first report on the application of pure folic acid as a sorbent. In this work, limits of detection and quantification were in the ranges of 0.13-0.46 and 0.43-1.50 µg/L, respectively. Relative standard deviations were in the ranges of 2-5% for intra-(n = 6) and 4-7% for interday (n = 4) precisions at a concentration of 20 µg/L for each analyte. Enrichment factors and extraction recoveries were obtained in the ranges of 365-670 and 45-84%, respectively. Efficiency of the method was evaluated by analyzing the analytes in various plastic-packed liquids.