title: Inkjet-printed disposable metal complexing indicator-displacement assay for sulphide determination in water.
abstract: A sulphide selective colorimetric metal complexing indicator-displacement assay has been developed using an immobilized copper(II) complex of the azo dye 1-(2-pyridylazo)-2-naphthol printed by inkjetting on a nylon support. The change in colour measured from the image of the disposable membrane acquired by a digital camera using the H coordinate of the HSV colour space as the analytical parameter is able to sense sulphide in aqueous solution at pH 7.4 with a dynamic range up to 145 μM, a detection limit of 0.10 μM and a precision between 2 and 11%.
authors.affiliation: ECsens, Department of Analytical Chemistry, Faculty of Sciences, University of Granada, E-18071 Granada, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Ariza-Avidad
authors.affiliation: ECsens, Department of Analytical Chemistry, Faculty of Sciences, University of Granada, E-18071 Granada, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Agudo-Acemel
authors.affiliation: ECsens, Department of Analytical Chemistry, Faculty of Sciences, University of Granada, E-18071 Granada, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Salinas-Castillo
authors.affiliation: ECsens, Department of Analytical Chemistry, Faculty of Sciences, University of Granada, E-18071 Granada, Spain. Electronic address: lcapitan@ugr.es.
authors.forename: L F
authors.initials: LF
authors.lastname: Capitán-Vallvey
mesh_terms: D003124:Colorimetry / Q000295:instrumentation / Q000379:methods*; D003300:Copper / Q000737:chemistry; D007202:Indicators and Reagents / Q000138:chemical synthesis / Q000737:chemistry*; D007281:Ink; D009284:Naphthols / Q000737:chemistry; D009757:Nylons / Q000737:chemistry; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010781:Photography / Q000295:instrumentation; D011327:Printing; D013440:Sulfides / Q000032:analysis*; D014867:Water / Q000737:chemistry*
chemical_list: D007202:Indicators and Reagents; D009284:Naphthols; D009757:Nylons; D009942:Organometallic Compounds; D013440:Sulfides; D014867:Water; C041728:1-(2-pyridylazo)-2-naphthol; D003300:Copper
keywords: Digital camera; H coordinate; Inkjet printing; Metal complexing indicator-displacement assay; Sulphide determination; Water analysis