title: Evaluation of thiosemicarbazone derivative as chelating agent for the simultaneous removal and trace determination of Cd(II) and Pb(II) in food and water samples.
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 440nm, 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 0.0-10.0μgmL(-1) 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 0.740×10(4)Lmol(-1)cm(-1), 1.52×10(-3)μgcm(-2) for Cd(II) and 1.809×10(4)L mol(-1)cm(-1), 1.15×10(-3)μgcm(-2) 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 0.00151μgL(-1) and 0.00264μgL(-1) for Cd(II) and Pb(II), respectively. Further validation using certified reference material, NIST 1568b, resulted in determined concentrations of 0.028±0.253μgg(-1) for Cd(II) and 0.046±0.325μgg(-1) 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.
authors.affiliation: Graduate School of Environmental Studies, Kwangwoon University, Seoul 139-701, Republic of Korea. Electronic address: reddyjchem@gmail.com.
authors.forename: Janardhan Reddy
authors.initials: JR
authors.lastname: Koduru
authors.affiliation: Department of Nanomaterial Chemistry, Dongguk University, Gyeongju 780-714, Republic of Korea. Electronic address: kdlee@dongguk.ac.kr.
authors.forename: Kap Duk
authors.initials: KD
authors.lastname: Lee
mesh_terms: D002104:Cadmium / Q000737:chemistry* / Q000302:isolation & purification; D002614:Chelating Agents / Q000737:chemistry*; D005591:Chemical Fractionation / Q000295:instrumentation / Q000379:methods*; D005506:Food Contamination / Q000032:analysis*; D007854:Lead / Q000737:chemistry* / Q000302:isolation & purification; D013053:Spectrophotometry; D013882:Thiosemicarbazones / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: D002614:Chelating Agents; C519033:N-ethyl-3-carbazolecarboxaldehyde-3-thiosemicarbazone; D013882:Thiosemicarbazones; D014874:Water Pollutants, Chemical; D002104:Cadmium; D007854:Lead
keywords: Cd(II); Extractive Spectrophotometry; Foods; ICP-OES; N-Ethyl-3-carbazolecarboxaldehyde-3-thiosemicarbazone; Pb(II); Water samples