title: A subnanomole level photoelectrochemical sensing platform for hexavalent chromium based on its selective inhibition of quercetin oxidation.
abstract: An indirect photoelectrochemical sensing platform for toxic hexavalent chromium was for the first time constructed based on its redox reaction with quercetin as both the electron donor and photosensitizer on a TiO(2) photoanode, and thus inhibiting the photocurrent quantitatively and selectively. The presence of even 500-fold coexisting Cr(III) does not interfere in the detection of Cr(VI). Under the optimum conditions, the electrode displayed a linear decrease response as the Cr(VI) concentration increased from 1 to 10 nmol L(-1) and from 20 to 140 nmol L(-1) with a detection limit of 0.24 nmol L(-1). Many possible ions in drinking water did not interfere with the detection, and the real sample detection results agreed well with those obtained by GFAAS. This work provide a novel methodology for the simple, low-cost photoelectrochemical detection of Cr(VI) in drinking water.
authors.affiliation: College of Chemistry and Engineering, Yangzhou University, 88 South University Avenue, Yangzhou 225002, PR China.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Li
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Zhanjun
authors.initials: Z
authors.lastname: Yang
authors.forename: Qin
authors.initials: Q
authors.lastname: Xu
authors.forename: Xiaoya
authors.initials: X
authors.lastname: Hu
mesh_terms: D002857:Chromium / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D011794:Quercetin / Q000032:analysis* / Q000037:antagonists & inhibitors* / Q000378:metabolism
chemical_list: D002857:Chromium; C074702:chromium hexavalent ion; D011794:Quercetin