Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7599114 | Food Chemistry | 2014 | 8 Pages |
Abstract
In the present investigation, prepared N-ethyl-3-carbazolecarbaxaldehyde-3-thiosemicarbazone (ECCT) and employed for the simultaneous removal and determination of trace amounts of Cd(II) and Pb(II) from food and water samples. Cd(II) and Pb(II) gave yellow and orange colored complexes with ECCT in acetate buffer at pH 6.0 with λmax, 380 and 440 nm, respectively. Both complexes were easily extractable into kerosene at 1:1(M:L) composition. It was in accordance with Beer's law in the range of 0.0-12.0 and 0.0-10.0 μg mLâ1 with 0.999 and 0.997 correlation coefficient for Cd(II) and Pb(II) complexes, respectively, indicated a good linearity between the two variables. The molar absorptivity and Sandell's sensitivity were found to be 0.740 Ã 104 L molâ1 cmâ1, 1.52 Ã 10â3 μg cmâ2 for Cd(II) and 1.809 Ã 104 L molâ1 cmâ1, 1.15 Ã 10â3 μg cmâ2 for Pb(II). The precision and accuracy of the method was checked for both metal ions by finding the relative standard deviations (n = 8), which were 0.689% and 0.443%, with detection limits of 0.00151 μg Lâ1 and 0.00264 μg Lâ1 for Cd(II) and Pb(II), respectively. Further validation using certified reference material, NIST 1568b, resulted in determined concentrations of 0.028 ± 0.253 μg gâ1 for Cd(II) and 0.046 ± 0.325 μg gâ1 for Pb(II). These determined values agree well with the certified values in the reference materials. The interfering effects of various cations and anions were also studied. The proposed method performance was also evaluated in terms of Student 'T' test and Variance 'F' test, which indicated the significance of the present method parameters, as an inter comparison of the experimental values using ICP-OES.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Janardhan Reddy Koduru, Kap Duk Lee,