title: Determination of oil-in-water using nanoemulsions as solvents and UV visible and total organic carbon detection methods.
abstract: The aim of this study was to investigate the application of oil in water (O/W) nanoemulsion as solvent in the extraction step for determination of oil content in oily water, measured using a UV visible spectrophotometer (UV-vis) and a total organic carbon (TOC) analyzer. The optical micrographs and distribution size curves showed that the use of a small amount of nanoemulsion was capable of transforming the oily water in a colloidal dispersion that can be read in the UV-vis and TOC-VCHS devices. The oil content results obtained showed great accuracy between the measurements, with very low average standard deviation (∼5%) for both UV-vis and TOC-VCHS. The new methods suggested in this work are very promising, since they allow simple, quick and accurate analyses, and especially require a lower volume of solvent (less than 1%) compared to those used in conventional analytic methods.
authors.affiliation: Federal University of Rio de Janeiro, Institute of Macromolecules, Laboratory of Macromolecules and Colloids for Petroleum Industry-Av Horacio Macedo, 2030, University City, 21941598 RJ, Brazil. josanecosta@ima.ufrj.br
authors.forename: Josane A
authors.initials: JA
authors.lastname: Costa
authors.forename: Naiara C
authors.initials: NC
authors.lastname: Farias
authors.forename: Yure G C
authors.initials: YG
authors.lastname: Queirós
authors.forename: Claudia R E
authors.initials: CR
authors.lastname: Mansur
mesh_terms: D002244:Carbon / Q000032:analysis*; D004655:Emulsions / Q000737:chemistry*; D009821:Oils / Q000032:analysis*; D012680:Sensitivity and Specificity; D012997:Solvents / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet / Q000191:economics / Q000379:methods*; D014867:Water / Q000032:analysis*
chemical_list: D004655:Emulsions; D009821:Oils; D012997:Solvents; D014867:Water; D002244:Carbon