title: Visual test of subparts per billion-level copper(II) by Fe3O4 magnetic nanoparticle-based solid phase extraction coupled with a functionalized gold nanoparticle probe.
abstract: By combining Fe(3)O(4) magnetic nanoparticle-based solid phase extraction with a gold nanoparticle-based visual test, a novel method was developed for the field assay of Cu(ii) in environmental water at subparts per billion-levels within 30 min. When a 200 mL water sample was treated with 12.5 mg L(-1) Fe(3)O(4) nanoparticles by the proposed procedure, the detection limit with the naked eye was 0.2 μg L(-1) Cu(ii). The proposed method is very specific to Cu(ii), with tolerance against at least 100-fold amounts of other environmentally relevant metal ions except for Hg(ii) (25-fold), and was successfully applied to the detection of trace Cu(ii) in tap water, river water, and treated wastewater, and results agreed well with that determined by inductively coupled plasma-mass spectrometry (ICP-MS).
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
authors.forename: Zhi-qiang
authors.initials: ZQ
authors.lastname: Tan
authors.forename: Jing-fu
authors.initials: JF
authors.lastname: Liu
authors.forename: Gui-bin
authors.initials: GB
authors.lastname: Jiang
mesh_terms: D003124:Colorimetry; D003300:Copper / Q000032:analysis* / Q000302:isolation & purification; D060766:Drinking Water / Q000032:analysis; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D005618:Fresh Water / Q000032:analysis; D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D052616:Solid Phase Extraction; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification
chemical_list: D060766:Drinking Water; D058185:Magnetite Nanoparticles; D014874:Water Pollutants, Chemical; D006046:Gold; D003300:Copper; D052203:Ferrosoferric Oxide