title: Fabrication of nano-porous hydroxyapatite modified electrode and its application for determination of p-chlorophenol.
abstract: Nano-porous hydroxyapatite (HAp) modified electrode was fabricated by simply electrodepositing HAp onto the glassy carbon electrode (GCE) from the electrolytes solution containing Ca(NO3)2 4H2O and NH4H2PO4, the resulting electrode (nano-HAp/GCE) was characterized with scanning electron microscopy (SEM). The electrochemical behavior of p-chlorophenol (p-CP) at nano-HAp/GCE was studied by cyclic voltammetry. The electrode displayed selective and enhanced electroanalytical response towards p-CP, obviously because p-CP is accumulated at the electrode. For the greater sensitivity, a semi-derivative technique was adopted to obtain the current signal. The results indicated that the nano-HAp/GCE exhibits substantial enhancement in electrochemical sensitivity for p-CP due to its large surface area and particular adsorbability. After accumulation of 4 min for p-CP on nano-HAp/GCE, the peak height was linearly related to the concentration of p-CP in the range of 1.0 x 10(-8) to 1.0 x 10(-7) mol L(-1). The detection limit was 4.0 x 10(-9) mol L-(1) at 3sigma level. Based on this, the modified electrode was successfully applied in water samples with low cost and high sensitivity.
authors.affiliation: School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Chu
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Zhang
mesh_terms: D002733:Chlorophenols / Q000032:analysis*; D003217:Conductometry / Q000295:instrumentation*; D017886:Durapatite / Q000737:chemistry*; D004566:Electrodes; D004784:Environmental Monitoring / Q000295:instrumentation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D016062:Porosity; D014159:Transducers; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D002733:Chlorophenols; D014874:Water Pollutants, Chemical; C029107:4-chlorophenol; D017886:Durapatite