title: Langmuir-Blodgett film of p-tert-butylthiacalix[4]arene modified glassy carbon electrode as voltammetric sensor for the determination of Hg(II).
abstract: The pi-A isotherms and UV-vis spectra of the transferred films suggested that the monolayer of p-tert-butylthiacalix[4]arene can coordinate with Hg(2+) at the air-water surface. From these observations, a glassy carbon electrode coated with Langmuir-Blodgett film of p-tert-butylthiacalix[4] arene as a new voltammetric sensor is designed for the determination of trace amounts of Hg(2+). Compared with bare glassy carbon electrode and modified glassy carbon electrode using direct coating method, the Langmuir-Blodgett film-modified electrode can greatly improve the measuring sensitivity of Hg(2+). Under the selected conditions, the Langmuir-Blodgett film-modified electrode in 0.1molL(-1) H(2)SO(4)+0.01molL(-1) KCl solution shows a linear voltammetric response for Hg(2+) in the range of 5.0x10(-10) to 1.5x10(-7)molL(-1), with a detection limit of 2.0x10(-10)molL(-1). The proposed method was also applied to determine Hg(2+) in water samples (tap, lake and river water). In addition, the fabricated electrode exhibited a distinct advantage of simple preparation, non-toxicity, good reproducibility and good stability.
authors.affiliation: Department of Chemistry, Zhengzhou University, Da xue Road, Zhengzhou 450001, PR China.
authors.forename: Fei
authors.initials: F
authors.lastname: Wang
authors.forename: Xiaohan
authors.initials: X
authors.lastname: Wei
authors.forename: Chenbin
authors.initials: C
authors.lastname: Wang
authors.forename: Shusheng
authors.initials: S
authors.lastname: Zhang
authors.forename: Baoxian
authors.initials: B
authors.lastname: Ye
mesh_terms: D053000:Analytic Sample Preparation Methods; D002138:Calibration; D002244:Carbon / Q000737:chemistry*; D017097:Electric Impedance; D004563:Electrochemistry; D004566:Electrodes; D005898:Glass / Q000737:chemistry*; D057230:Limit of Detection; D008628:Mercury / Q000032:analysis* / Q000737:chemistry; D018625:Microscopy, Atomic Force; D010636:Phenols / Q000737:chemistry*; D011312:Pressure; D015203:Reproducibility of Results; D045483:Rivers / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D010636:Phenols; C442852:p-tert-butylthiacalix(4)arene; D014867:Water; D002244:Carbon; D008628:Mercury