Electrochemical fabrication of a novel polycarbazole coating for the headspace solid-phase microextraction and GC determination of some chlorobenzenes.
A novel polycarbazole coating was prepared by cyclic voltammetry on a platinum wire. The solution for electropolymerization contained N,N-dimethylformamide, propylene carbonate (v/v = 1:9), 0.10 M carbazole and 0.10 M tetrabutylammonium perchlorate; the cyclic scan potential range was 0.8-2.0 V (versus Ag/AgCl). The resulting polycarbazole coating showed a porous structure and had a large specific surface area. When it was used for the headspace solid-phase microextraction of chlorobenzenes (i.e. chlorobenzene, 2-chlorotoluene, 1,2-dichlorobenzene, 1,3-dichlorobenzene, 1,2,4-trichlorobenzene) followed by GC analysis, it presented excellent analytical performance. Under the optimized conditions the linear ranges were 0.25-250 μg/L with correlation coefficients >0.985, and the low detection limits were 15-61 ng/L (S/N = 3) for different chlorobenzenes. The RSDs were 2.4-4.9% for five successive measurements with a single fiber, and for fiber-to-fiber they were 6.3-13.1% (n = 5). Furthermore, the polycarbazole coating displayed good thermal stability (>350°C) and durability (more than 250 times). The proposed method was successfully applied to the extraction and determination of chlorobenzenes in waste water and lake water, and the recoveries for standards added were 86-114% for different analytes.
Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Hubei, China.
Meng
M
Wang
Fa-Qiong
FQ
Zhao
Bai-Zhao
BZ
Zeng
D002227:Carbazoles / Q000138:chemical synthesis / Q000737:chemistry*; D002722:Chlorobenzenes / Q000032:analysis*; D002849:Chromatography, Gas; D055664:Electrochemical Techniques; D010316:Particle Size; D010984:Platinum / Q000737:chemistry; D058105:Polymerization; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D016062:Porosity; D052617:Solid Phase Microextraction; D013499:Surface Properties
D002227:Carbazoles; D002722:Chlorobenzenes; D011108:Polymers; D010984:Platinum
Chlorobenzenes; Electrochemical polymerization; Platinum wire; Polycarbazole; Solid-phase microextraction