title: Flow-through photometric sensor for determination of sulfonamides.
abstract: A sensor based on integration of spectrophotometric detection and retention of the product of the Bratton-Marshall reaction for the determination of sulfanilamide, sulfamethazine, sulfaquinoxaline and sulfathiazole is reported. The methods developed using this sensor in a flow injection manifold feature linear ranges for these analytes between 10 and 1200 ng ml(-1) with relative standard deviations smaller than 2.6% in all instances and they were applied to the determination of sulfonamides in spiked milk and water samples with excellent results. The two main advantages of these sensor-based methods over other automated and non-automated counterparts are enhanced sensitivity as a result of in situ concentration and avoidance of using a de-bubbler to eliminate the nitrogen produced in the flowing system.
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, University of Cordoba, Spain.
authors.forename: M T
authors.initials: MT
authors.lastname: Tena
authors.forename: M D
authors.initials: MD
authors.lastname: Luque de Castro
authors.forename: M
authors.initials: M
authors.lastname: Valcárcel
mesh_terms: D000818:Animals; D008892:Milk / Q000737:chemistry*; D010783:Photometry; D013449:Sulfonamides / Q000032:analysis*
chemical_list: D013449:Sulfonamides