title: Development of sequential injection-lab-at-valve (SI-LAV) micro-extraction instrumentation for the spectrophotometric determination of an anionic surfactant.
abstract: The development of instrumentation for sequential injection analysis with a "lab-at-valve" (SIA-LAV) micro-extraction system is presented. The extractive determination of an anionic surfactant using methylene blue was selected as a model. Sample, reagents and organic solvent were sequentially aspirated into an extraction coil connected to the center of a selection valve, where extraction took place by flow reversal. The aqueous and organic phases were separated in a LAV unit attached to one port of the valve. The LAV unit situated a fiber-optic spectrophotometer to monitor the absorbance change of the extract product in the organic phase. The developed SIA-LAV system offers an alternative micro-total analysis system for automated micro-extraction.
authors.affiliation: Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand. rburakham@yahoo.com
authors.forename: Rodjana
authors.initials: R
authors.lastname: Burakham
authors.forename: Jaroon
authors.initials: J
authors.lastname: Jakmunee
authors.forename: Kate
authors.initials: K
authors.lastname: Grudpan
mesh_terms: D000838:Anions / Q000032:analysis; D017022:Flow Injection Analysis / Q000295:instrumentation / Q000379:methods; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation* / Q000379:methods*; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet / Q000295:instrumentation / Q000379:methods; D013501:Surface-Active Agents / Q000032:analysis*; D014867:Water / Q000737:chemistry
chemical_list: D000838:Anions; D013501:Surface-Active Agents; D014867:Water