Colorimetric analysis of water and sand samples performed on a mobile phone
2011 (English)In: Talanta: The International Journal of Pure and Applied Analytical Chemistry, ISSN 0039-9140, E-ISSN 1873-3573, Vol. 84, no 4, 1118-1123 p.Article in journal (Refereed) Published
Analysis of water and sand samples was done by reflectance measurements using a mobile phone. The phone’s screen served as light source and front view camera as detector. Reflected intensities for white, red, green and blue colors were used to do principal component analysis for classification of several compounds and their concentrations in the water. Classification of iron (III), chromium (VI) and sodium salt of humic acid was obtained using reflected intensities from blue and green light for concentrations 2-10 mg/l. Analysis of As(III) from 25-400 μg/l based on reflection of red light was performed utilizing the bleaching reaction of tincture of iodine containing starch. Enhanced sensitivity to low concentrations of arsenic was obtained by adding reflected intensities from white light to the analysis. Model colored sand samples representing discoloration caused by the presence of arsenic in groundwater were also analyzed.
Place, publisher, year, edition, pages
Elsevier , 2011. Vol. 84, no 4, 1118-1123 p.
mobile phone, home analysis, colorimetric assay, multivariate analysis, arsenic detection
IdentifiersURN: urn:nbn:se:liu:diva-65732DOI: 10.1016/j.talanta.2011.03.016ISI: 000291078100016OAI: oai:DiVA.org:liu-65732DiVA: diva2:398568