title: Naked-eye and colorimetric detection of arsenic(III) using difluoroboron-curcumin in aqueous and resin bead support systems.
abstract: This work presents a new colorimetric method that is simple, rapid and cost effective for the determination of arsenic(III) in water samples. The method is based on changes in the absorbance of difluoroboron-curcumin (BF2-curcumin), prepared by the reaction of borontrifluoride diethyletherate ((C2H5)2OBF3) and curcumin. The BF2-curcumin was dissolved in 60% ethanol, which yielded an orange solution with the maximum absorbance at 509 nm. Upon the addition of arsenic(III), the color of the BF2-curcumin solution changed from orange to blue and the absorbance was measured by UV-visible spectrometry at 632 nm. The BF2-curcumin was applicable in both solution and coated resin. Under the optimal conditions, the detection limits achieved by means of UV-visible spectrometry, naked-eye detection with BF2-curcumin solution and naked-eye detection with BF2-curcumin-coated resin were found to be 0.26, 25 and 30 μM, respectively.
authors.affiliation: Department of Chemistry, Faculty of Science, Chulalongkorn University.
authors.forename: Sirinya
authors.initials: S
authors.lastname: Sirawatcharin
authors.forename: Amornrat
authors.initials: A
authors.lastname: Saithongdee
authors.forename: Anusak
authors.initials: A
authors.lastname: Chaicham
authors.forename: Boosayarat
authors.initials: B
authors.lastname: Tomapatanaget
authors.forename: Apichat
authors.initials: A
authors.lastname: Imyim
authors.forename: Narong
authors.initials: N
authors.lastname: Praphairaksit