New use of polypyrrole-chloride for selective preconcentration of copper prior to its determination of flame atomic absorption spectrometry.
Polypyrrole-chloride was studied as a new sorbent for preconcentration of copper(II) using solid-phase extraction prior to determination by flame atomic absorption spectrometry. The sorbent showed an extremely high selectivity towards copper(II) as an anionic chelate, i.e. Cu (pyrocatechol violet)(2)(2-) in the pH range of 4-7. Copper(II) as Cu (pyrocatechol violet)(2)(2-) was selectively retained on a column containing 1.0 g of polypyrrole-chloride and quantitatively eluted by 3 mL of 2.0 mol L(-1) nitric acid. The calibration graph was linear with a correlation coefficient of 0.999 at levels near the detection limit and up to at least 50 microg L(-1). When applied for preconcentration and determination of copper in tap water, waste water and hot spring water, the recoveries were found to be 96, 101 and 95%, respectively, with high precision (% relative standard deviation <4%) and low detection limit (0.87 microg L(-1)). Verification of the accuracy was carried out by the analysis of a standard reference material (BCR 715 wastewater-SRM). The relative error was +3.33%. The proposed method was successfully applied to the determination of copper in tap water, waste water and hot spring water samples.
Sönmez
Saygin
S
Chemistry Department, Science and Arts Faculty, Pamukkale University, 20020 Denizli, Turkey.
Divrikli
Umit
U
Elçi
Latif
L
D000327:Adsorption; D002138:Calibration; D003300:Copper / Q000032:analysis* / Q000592:standards; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D011108:Polymers; D011758:Pyrroles; D012015:Reference Standards; D052616:Solid Phase Extraction / Q000379:methods; D013054:Spectrophotometry, Atomic / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D011108:Polymers; D011758:Pyrroles; D014874:Water Pollutants, Chemical; C067635:polypyrrole; D003300:Copper