Inkjet-printed disposable metal complexing indicator-displacement assay for sulphide determination in water |
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Authors: | M Ariza-Avidad M Agudo-AcemelA Salinas-Castillo LF Capitán-Vallvey |
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Institution: | ECsens, Department of Analytical Chemistry, Faculty of Sciences, University of Granada, E-18071 Granada, Spain |
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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%. |
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Keywords: | Sulphide determination Water analysis Metal complexing indicator-displacement assay H coordinate Digital camera Inkjet printing |
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