title: A novel spectrofluorometric method for the determination of arsenic in human hair using Dy2O3-doped CeO2 nanoparticles.
abstract: This paper describes a simple and inexpensive method for the determination of arsenic in human hair samples based on spectrofluorometric detection. The applied Dy2O3-doped CeO2 (DDC) nanoparticles were synthesized using microwave-induced combustion technique and subjected to analytical samples containing As(V) species. At optimum conditions (pH 6, DDC concentration 3 mg L(-1) and excitation/emission wavelengths 250 nm/352 nm), the fluorescence emission of DDC nanoparticles was diminished by increasing the As(V) concentration present in the medium. The co-existent ions present in hair were not interfered. A method for the speciation of As(III) and As(V) is also described. The method was validated using a well-known separation/spectrofluorometric method. There was no significant difference at the 95% confidence level between the results of the two methods. The proposed method is characterized by a wide analytical concentration range (5.0 × 10(-8)-1.0 × 10(-5) M), a detection limit for As(V) of 1 × 10(-8) mol L(-1) and relative standard deviation of 1.4%. The recoveries for the spiked amounts of As(V) was found to be 93.3-104.0%.
authors.affiliation: Department of Chemistry, Faculty of Science, University of Birjand, Birjand, P.O. Box 414, Iran. mshosseini1336@yahoo.com.
authors.forename: Mohammad Saeid
authors.initials: MS
authors.lastname: Hosseini
authors.forename: Foroogh
authors.initials: F
authors.lastname: Belador
mesh_terms: D001151:Arsenic / Q000032:analysis*; D002563:Cerium / Q000737:chemistry*; D004419:Dysprosium / Q000737:chemistry; D005260:Female; D006197:Hair / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D053768:Metal Nanoparticles / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence
chemical_list: D012997:Solvents; D004419:Dysprosium; D002563:Cerium; C030583:ceric oxide; D001151:Arsenic; C030582:dysprosium oxide