Ionic liquid-based hollow fiber supported liquid membrane extraction combined with thermospray flame furnace AAS for the determination of cadmium

Abstract

We have developed a simple and effective method for hollow fiber liquid-phase microextraction of cadmium. It is based on the use of a room temperature ionic liquid (RTIL) and was coupled to thermospray flame furnace AAS. The RTIL was placed in the pores of a polypropylene hollow fiber (acting as a liquid membrane) and also used as the acceptor solution. Ammonium pyrrolidinedithiocarbamate (APDC) was used as the chelating agent. The effects of the concentration of APDC, the pH of samples, stirring rates, extraction time, and potential interferences were optimized to result in a detection limit of 9 ng L −1 and an enrichment factor of 90. The relative standard deviation is 4.7% (at 0.5 ng mL −1 , for n05). The method was successfully applied to the determination of cadmium.

Application of negligible and full depletion micro-extraction in environmental sciences

“…The exhaustive extraction mode effectively eliminates the sample matrix effect, and thus high recovery is obtained for all the studied samples with various matrices. Recently, attempts have also been made toward exhaustive HF-LPME using ionic liquids [87][88][89] and electromembrane [90,91] for environmental and biological studies.…”

Room temperature ionic liquids enhanced the speciation of Cr(VI) and Cr(III) by hollow fiber liquid phase microextraction combined with flame atomic absorption spectrometry

“…HF-LPME is one of the promising miniaturized preconcentration techniques and has attracted considerable attention in recent years [22][23][24][25][26]. HF-LPME owns many advantages over traditional liquid-liquid extraction, such as low cost, safety, environmental friendliness and high concentration factors.…”

Performance of Avocado Seed Activated Carbon as Adsorbent for Highly Sensitive Determination of Cd Using a Flow Injection System Online Coupled to TS-FF-AAS

“…10,12 The performance of TS-FF-AAS for trace metal determination has been widely improved when associated with preconcentration methods. 13 The most common preconcentration methods associated with TS-FF-AAS include dispersive liquidliquid microextraction (DLLME), 14 hollow fiber supported liquid membrane extraction (HF-SLME), 15 supramolecular solvents based dispersive liquid-liquid microextraction (SUPRAs), 16 cloud-point extraction (CPE), 17,18 and solidphase extraction (SPE). 19,20 Solid-phase extraction has been considered the most common technique because of its advantages as simplicity, automation ease, higher preconcentration factor, reusability of adsorbent and the wide variety of adsorbents that can be employed.…”