RT journal article
T1 A Green Method for the Determination of Cadmium in Natural Waters Based on Multi-Fibre Supported Liquid Membranes
A1 Pinto Ganfornina, Juan José
A1 Mánuel Delgado, Victoria
A1 Moreno Aguilar, Carlos
A2 Química Analítica
K1 hollow fiber liquid phase micro-extraction
K1 liquid membrane
K1 cadmium
K1 Cyanex 272
K1 preconcentration
K1 Natural waters
AB Supported liquid membranes have been used to implement a hollow fibre liquid-phasemicroextraction (HF-LPME) method for the preconcentration of Cd(II) in natural waters as a samplepreparation step for its determination by high-resolution continuum source graphite furnace atomicabsorption spectrometry (HR-CS-GFAAS). This system was designed to use four hollow fibressimultaneously with the same sample, thus improving the simplicity, speed and reproducibilityof the results. The organic liquid membrane bis-(2,4,4-trimethylpentyl) phosphinic acid (Cyanex®272) dissolved in dihexylether (DHE) was immobilised into the pores of the walls of polypropylenehollow fibres. After extraction, the cadmium-enriched acidic phases were recovered and analysed bytriplicate. To optimise the extraction process, the effect of both physical and chemical variables wasstudied, and optimum results with an enrichment factor (EF) of 292 were obtained for a fibre lengthof 6 cm, 1.06 M Cyanex 272, 0.04 M HNO3, stirring rate of 600 rpm and an extraction time of 4.26 h.For practical applications, extraction time was reduced to 2 h, keeping the EF as high as 130. Underthese conditions, a detection limit of 0.13 ng L-1 Cd(II) was obtained, with a reproducibility of 3.3 %and a linear range up to 3 ug L-1 being achieved. The proposed method was successfully applied tothe determination of cadmium in mineral, tap and seawater samples.
PB MDPI
SN 2077-0375
YR 2023
FD 2023
LK http://hdl.handle.net/10498/30366
UL http://hdl.handle.net/10498/30366
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-nov-2026