RETRACTED: Solid phase extraction method for the determination of lead, nickel, copper and manganese by flame atomic absorption spectrometry using sodium bispiperdine-1,1′-carbotetrathioate (Na-BPCTT) in water samples

Solid phase extraction of heavy metal ions in environmental samples on multiwalled carbon nanotubes

“…Among these preconcentration techniques, solid phase extraction is preferred a lots of researchers due to its advantages including as simple and fast extractor system, easily adaptable to the preconcentration and to the determination of trace metal ions by flow injection analysis technique. Solid phase extraction has a relatively high concentration factor and the ability of treating large volume samples free from contamination [12,13]. Solid phase extraction technique has been widely used in the preconcentration/separation of trace and ultra trace amounts of inorganic and organic species, in order to enhance sensitivity and to separate analytical matrix.…”

PVC Coated with an Indole Derivative-Loaded Triton X-100: a New Sorbent for Cu, Zn and Mn Ions

“…Each column can be used for at least 15 successive analyses without any substantial change in metal ion recovery. The detection limits for the analytes studied are superior to those of other preconcentration techniques that have been used for analyses [52,53]. The proposed method is thus convenient and economical.…”

Three modified activated carbons by different ligands for the solid phase extraction of copper and lead

“…Each column can be used for at least 10 successive analyses without considerable change in metal ions recovery. The detection limits of analytes are superior to those of preconcentration techniques for analyses [38][39][40][41][42][43][44][45][46]. The good features of the proposed method showed that it's a convenient and low cost one.…”