HCl- Etched Steel Fiber for Determination of Phthalates in Water Samples by Solid-Phase Microextraction

In the present work, a stainless steel wire was etched by hydrochloric acid during a chemical etching process. The obtained black layer on the surface of the fiber was used as sorbent for extraction of trace amount of phthalates in the aqueous samples by solid phase microextraction. New fiber efficiency was investigated using a home-made solid-phase microextraction (SPME) device and gas chromatography/flame ionization detection (GC-FID). The effect of the key parameters on extraction and desorption process such as extraction time, extraction temperature, salt addition, desorption time and temperature were optimized. New fiber has easy made process, high thermal and mechanical stability and low-cost. Validation of the method was carried out under the optimized condition and the results showed that calibration curves were linear in the range of 5 to 300 μg L−1 for the target analytes. Limits of detection were ranged between 0.02-1.8 μg L−1 (S/N=3). Intra-day, Inter-day and fiber-to-fiber reproducibilites were investigated in different concentrations (at a concentration of 50 μgL−1, precisions were between, 2.94-6.15, 6.85-8.13 and 8.90-13.76 respectively).