title: The development of sequential injection analysis coupled with lab-on-valve for copper determination.
abstract: A sequential injection analysis (SIA) using lab-on-valve with air segmentation and spectrophotometric detection was designed for copper(II) determination. It is based on the reaction of copper(II) and 2-carboxy-2'-hydroxy-5'-sulfoformazyl benzene (Zincon) in a weak alkaline solution between the air zones. Beer's Law was obeyed over the range of 0.1-2.0mgL(-1) copper(II) with a correlation coefficient 0.9985 and a slope of 0.2893 absorbance unit/mgL(-1). The relative standard deviation was 2.0% for a series of 10 measurements of 0.5mgL(-1) copper(II) solution. The detection limit (3 S/N) and the limit of quantification (LOQ) were 0.05 and 0.17mgL(-1) respectively. This method has been successfully applied to determination of copper(II) in wastewater with a sample throughput of 120h(-1). The method is superior to the batchwise method in that it provides fully automation, rapidity, less reagents and sample consumption with little waste generation.
authors.affiliation: Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Division of Analytical Chemistry, Department of Chemical Technology, Rajamanjala University of Technology Krungthep, Bangkok 10120, Thailand.
authors.forename: Tapparath
authors.initials: T
authors.lastname: Leelasattarathkul
authors.forename: Saisunee
authors.initials: S
authors.lastname: Liawruangrath
authors.forename: Mongkon
authors.initials: M
authors.lastname: Rayanakorn
authors.forename: Winai
authors.initials: W
authors.lastname: Oungpipat
authors.forename: Boonsom
authors.initials: B
authors.lastname: Liawruangrath