title: Simple and fast colorimetric detection of inorganic arsenic selectively adsorbed onto ferrihydrite-coated silica gel using silver nanoplates.
abstract: The optical detection for inorganic arsenic (As) semi-quantitative determination is presented by using silver nanoplates (AgNPls). The color of AgNPs is immediately changed in the presence of As(III) and As(V) with the same sensitivity. To improve the selectivity of AgNPls for As detection, ferrihydrite-coated silica gel (SiO2-Fh) was specifically exploited as adsorbent for arsenic prior to As detection by AgNPls. The developed method provides the detection limit of 0.5ppm with the detection range between 0.5ppm and 30.0ppm for As determination observed with naked eye, and allows to determine total inorganic arsenic. This is the first report of As detection approach combining As removal technology together with nanotechnology. This combined technique provides a rapid, sensitive and selective method for monitoring As levels in aqueous samples, and can be employed as a testing field kit to screen arsenic contamination outside of a laboratory.
authors.affiliation: Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Wattana, Bangkok 10110, Thailand.
authors.forename: Weena
authors.initials: W
authors.lastname: Siangproh
authors.affiliation: Electrochemistry and Optical Spectroscopy Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok 10330, Thailand.
authors.forename: Orawan
authors.initials: O
authors.lastname: Chailapakul
authors.affiliation: Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Wattana, Bangkok 10110, Thailand. Electronic address: kriangsaks@g.swu.ac.th.
authors.forename: Kriangsak
authors.initials: K
authors.lastname: Songsrirote
mesh_terms: D001151:Arsenic; D003124:Colorimetry; D005290:Ferric Compounds; D053768:Metal Nanoparticles; D058428:Silica Gel; D012822:Silicon Dioxide; D012834:Silver
chemical_list: D005290:Ferric Compounds; D012834:Silver; D058428:Silica Gel; D012822:Silicon Dioxide; C092844:ferric oxyhydroxide; D001151:Arsenic
keywords: Arsenic; Colorimetry; Ferrihydrite-coated silica gel; Optical detection; Silver nanoplates