Determination of copper, nickel, manganese and cadmium ions in aqueous samples by flame atomic absorption spectrometry after simultaneous coprecipitation with Co(OH)2

Publication date: November 2019Source: Arabian Journal of Chemistry, Volume 12, Issue 7Author(s): Sayed Zia Mohammadi, Tayebeh Shamspur, Yar Mohammad BaghelaniAbstractA separation-preconcentration procedure was developed for the determination of trace amounts of copper, nickel, manganese and cadmium ions in water samples by flame atomic absorption spectrometry after coprecipitation by Co(OH)2 as a carrier without a chelating agent. The influence of the various analytical parameters such as pH, amount of carrier reagent, standing time, centrifugation rate and time, sample volume and matrix effects on the recovery of the analyte ions was studied. Under the specified experimental conditions the calibration curves for Ni(II) and Cu(II) were linear from 0.5 to 200 ng mL−1 and for Mn(II) and Cd(II) from 0.5 to 250 and 0.3 to 80 ng mL−1, respectively. The relative standard deviations for seven replicate determinations of a mixture of 40.0 ng mL−1 of Cu(II), Ni(II), Mn(II) and 20 ng mL−1 of Cd(II) in the original solution were 1.9%, 1.7%, 1.8% and 2.1%, respectively. The detection limits based on 3Sb/m for Cu(II), Ni(II), Mn(II) and Cd(II) in the original solution were 0.2, 0.2, 0.3 and 0.07 ng mL−1, respectively. The limits of quantification based on 10Sb/m for Cu(II), Ni(II), Mn(II) and Cd(II) in the original solution were 6.7, 6.7, 10.0 and 2.3 ng mL−1, respectively. The proposed method has been applied to the...
Source: Arabian Journal of Chemistry - Category: Chemistry Source Type: research