title: Electrochemical preparation of polyaniline-polypyrrole solid-phase microextraction coating and its application in the GC determination of several esters.
abstract: A novel polyaniline-polypyrrole (PANI-PPY) composite film coated stainless steel wire was prepared by cyclic voltammetry. Firstly, PANI was electrodeposited on a stainless steel wire from a solution containing 0.1 M aniline and 1M HNO3, after the PANI coating was dried in air PPY was electrodeposited on it from a solution containing 0.1 M pyrrole and 0.1 M p-methylbenzene sulfonic acid. The resulting PANI-PPY fiber showed reticulate structure and had large specific surface area. When it was used for the headspace solid-phase microextraction of several esters (i.e. methyl anthranilate, ethyl-o-aminobenzoate, dimethyl phthalate, methyl laurate, and diethyl phthalate), followed by gas chromatographic determination, it presented higher extraction capability in comparison with PPY and PANI coatings. Under the optimized conditions, the linear ranges were 0.07-300 μg L(-1) and the detection limits were 0.05-0.38 μg L(-1) for different esters. The PANI-PPY fiber also showed high durability, after being used for about 160 times its extraction capacity only changed a little. The proposed method was successfully applied to the determination of these esters in real samples and the recoveries were 90-102%.
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei Province, PR China.
authors.forename: Shasha
authors.initials: S
authors.lastname: Zhao
authors.forename: Mian
authors.initials: M
authors.lastname: Wu
authors.forename: Faqiong
authors.initials: F
authors.lastname: Zhao
authors.forename: Baizhao
authors.initials: B
authors.lastname: Zeng
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry; D001557:Benzenesulfonates / Q000737:chemistry; D001566:Benzocaine / Q000302:isolation & purification*; D002849:Chromatography, Gas; D004595:Electroplating; D017743:Equipment Reuse; D005618:Fresh Water / Q000737:chemistry*; D007848:Laurates / Q000302:isolation & purification*; D057230:Limit of Detection; D017942:Nitric Acid / Q000737:chemistry; D010795:Phthalic Acids / Q000302:isolation & purification*; D011108:Polymers / Q000737:chemistry; D011758:Pyrroles / Q000737:chemistry; D052617:Solid Phase Microextraction / Q000295:instrumentation / Q000379:methods*; D013193:Stainless Steel; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D062367:ortho-Aminobenzoates / Q000302:isolation & purification*
chemical_list: C573194:4-methylbenzenesulfonic acid; D000814:Aniline Compounds; D001557:Benzenesulfonates; D007848:Laurates; D010795:Phthalic Acids; D011108:Polymers; D011758:Pyrroles; D014874:Water Pollutants, Chemical; D062367:ortho-Aminobenzoates; C416807:polyaniline; C024629:dimethyl phthalate; D013193:Stainless Steel; C067635:polypyrrole; D017942:Nitric Acid; C089549:lauric acid methyl ester; C038892:methyl anthranilate; C023650:aniline; D001566:Benzocaine; C007379:diethyl phthalate
keywords: Electrochemical polymerization; Esters; Polyaniline; Polypyrrole; Solid-phase microextraction