Abstract
<p class="PaperAbstract"><span lang="EN-US">A novel analytical reagent, 4-(2-hydroxyphenylethamino)benzene-1,3-diol was synthesized for determination of nickel(II) in biological samples and plant materials by extractive differential pulse polarography. The analysis of nickel(II) was carried out by extracting the nickel(II)-(4-(2-hydroxyphenylethamino)benzene-1,3-diol) complex from chloroform prior to injecting into the instrument. The electrochemical behavior of nickel(II) complex was studied under optimum parameters like effect of pH, pulse amplitude, scan rate and choice of solvent. The calibration curve was constructed in the concentration range of 0.05-42 µg mL<sup>-1</sup> at pH 4.0 (acetate buffer) with a correlation coefficient of 0.992, respectively. Interference of diverse ions was also investigated during the analysis of nickel(II) to optimize the conditions. The accuracy and validity of the proposed method were checked by the analysis of Certified Reference Materials which is distributed by the National Institute of Standard Technology</span></p>
Highlights
Nickel(II) exposure into environment of more than 0.05 mg/kg has a toxic effect on human beings and animals [1,2]
The analytical reagent 4-2-HPEDB-1,3,D is a ligand having chelating functional groups that form a complex with Ni(II) ions at pH 4.0
In the FTIR spectra of the complex, a strong peak was observed in the region of 1610-1640 cm-1, which is ascribed to involvement of nitrogen donor atoms of azomethine (-C=N-) in coordination to the Ni(II) ions [14]
Summary
Nickel(II) exposure into environment of more than 0.05 mg/kg has a toxic effect on human beings and animals [1,2]. We have developed a simple, economic sensitive differential pulse polarography method, after extracting the metal complex from chloroform in biological samples and plant materials. The proposed method is found free from various interferences and successfully applied for determination of nickel (II) in biological and plant materials.
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