Electroplating of nanostructured polyaniline-polypyrrole composite coating in a stainless-steel tube for on-line in-tube solid phase microextraction.
In this work, a novel and efficient on-line in-tube solid phase microextraction method followed by high performance liquid chromatography was developed for preconcentration and determination of trace amounts of parabens. A nanostructured polyaniline-polypyrrole composite was electrochemically deposited on the inner surface of a stainless steel tube and used as the extraction phase. Several important factors that influence the extraction efficiency, including type of solid-phase coating, extraction and desorption times, flow rates of the sample solution and eluent, pH, and ionic strength of the sample solution were investigated and optimized. Under the optimal conditions, the limits of detection were in the range of 0.02-0.04 μg L(-1). This method showed good linearity for parabens in the range of 0.07-50 μg L(-1), with coefficients of determination better than 0.998. The intra- and inter-assay precisions (RSD%, n=3) were in the range of 5.9-7.0% and 4.4-5.7% at three concentration levels of 2, 10, and 20 μg L(-1), respectively. The extraction recovery values for the spiked samples were in the acceptable range of 80.3-90.2%. The validated method was successfully applied for analysis of methyl-, ethyl-, and propyl parabens in some water, milk, and juice samples.
Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
Hamid
H
Asiabi
Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran. Electronic address: yyamini@modares.ac.ir.
Yadollah
Y
Yamini
Department of Analytical Chemistry, Faculty of Chemistry, K.N. Toosi University of Technology, Tehran, Iran.
Shahram
S
Seidi
Environmental Health Engineering Department, School of Public Health, Iran University of Medical Sciences, Iran.
Ali
A
Esrafili
Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
Fatemeh
F
Rezaei
D000814:Aniline Compounds / Q000737:chemistry*; D000818:Animals; D001628:Beverages / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid; D004595:Electroplating; D005504:Food Analysis / Q000295:instrumentation / Q000379:methods*; D008892:Milk / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry; D010226:Parabens / Q000032:analysis*; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D052617:Solid Phase Microextraction / Q000295:instrumentation / Q000379:methods*; D013193:Stainless Steel / Q000737:chemistry; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis
D000814:Aniline Compounds; D010226:Parabens; D011108:Polymers; D011758:Pyrroles; D014874:Water Pollutants, Chemical; C416807:polyaniline; D014867:Water; D013193:Stainless Steel; C067635:polypyrrole
In-tube solid phase microextraction; Nanostructured composite; Paraben; Polyaniline; Polypyrrole