title: Indirect inductively coupled plasma atomic emission determination of fluoride in water samples by flow injection solvent extraction.
abstract: An indirect determination of fluoride in water by inductively coupled plasma atomic emission spectrometry combined with flow injection coupled with solvent extraction is reported in this paper. A manifold for rapid determination of fluoride has been designed that uses a single coil for complex formation and extraction. The method involves the formation of lanthanum/alizarin complexone/fluoride complex and its extraction into hexanol containing N,N-diethylaniline. The concentration of fluoride is determined indirectly by introduction of the organic layer into the plasma and measurement of the emission intensity of the La II 333.75-nm line. The optimum experimental conditions for the determination are described. A coiled groove phase separator fitted with a grid and PTFE porous membrane was used in this work. The sampling rate was 36 samples per hour and the calibration graphs were linear from 0.03 to 1.3 micrograms/mL. The relative standard deviation found was 2.16% for 200 microL of 1 microgram/mL of fluoride. The method is selective and has been applied satisfactorily to the determination of fluoride in water samples.
authors: National Research Institute for Pollution and Resources, Tsukuba, Ibaraki, Japan.
authors: J L
authors: JL
authors: Manzoori
authors: A
authors: A
authors: Miyazaki
mesh_terms: D005459:Fluorides / Q000032:analysis*; D012997:Solvents; D013053:Spectrophotometry; D014867:Water / Q000032:analysis*
chemical_list: D012997:Solvents; D014867:Water; D005459:Fluorides