title: Introducing absorptive stripping voltammetry: wide concentration range voltammetric phenol detection.
abstract: Carbon paste electrodes are developed for the detection of phenols via a procedure in which the phenols are allowed to accumulate in the paste via transfer from an aqueous solution prior to electro-oxidation. Importantly, the use of such paste electrodes is shown to substantially overcome the "self-passivating" behaviour of the phenol oxidation which usually constrains the electrode process to low concentrations and single-shot experiments. In this paper, 4-phenoxyphenol could be detected in the range from 2.5 to 40 μM, phenol from 2.5 μM to 60 mM and 4-methoxyphenol from 5.0 to 40 μM. The electrodes were re-usable without surface renewal for concentrations up to 1.0 mM. The use of a bulk phenol solution for pre-concentration via absorptive uptake into a bulk phase followed by electrochemical quantification represents a new form of electroanalysis, namely "absorptive stripping voltammetry" complementary to "adsorptive stripping voltammetry" where accumulation occurs via adsorption on an electrode surface.
authors.affiliation: Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK. richard.compton@chem.ox.ac.uk.
authors.forename: Rita
authors.initials: R
authors.lastname: Nissim
authors.forename: Richard G
authors.initials: RG
authors.lastname: Compton
mesh_terms: D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D057230:Limit of Detection; D019800:Phenol / Q000737:chemistry; D010647:Phenyl Ethers / Q000737:chemistry
chemical_list: D010647:Phenyl Ethers; D019800:Phenol; C530483:4-phenoxyphenol