Shishehbore M Reza, Afkhami Abbas, Bagheri Hasan
Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran.
Chem Cent J. 2011 Jul 15;5:41. doi: 10.1186/1752-153X-5-41.
A method for the preconcentration of trace heavy metal ions in environmental samples has been reported. The presented method is based on the sorption of Cu(II), Cd(II), Ni(II) and Cr(III) ions with salicylic acid as respective chelate on silica-coated magnetite nanoparticles. Prepared adsorbent was characterized by XRD, SEM, BET and FT-IR measurements. The metals content of the sorbed complexes are eluted using 4.0 mL of 1.0 mol L-1 nitric acid. The influences of the analytical parameters including pH, amount of solid phase and condition of eluting solution, the effects of matrix ions on the retention of the analytes were examined. The accuracy and precision of suggested method were tested by analyzing of certified reference materials. The detection limits (3Sb/m, N = 8) for Cu(II), Cd(II), Ni(II) and Cr(III) ions are 0.22, 0.11, 0.27 and 0.15 μg L-1, respectively, and the maximum preconcentration factor is 200. The method was successfully applied to the evaluation of these trace and toxic metals in various waters, foods and other samples.
已有报道一种用于环境样品中痕量重金属离子预富集的方法。该方法基于以水杨酸作为相应螯合剂，使铜（II）、镉（II）、镍（II）和铬（III）离子吸附在二氧化硅包覆的磁铁矿纳米颗粒上。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、比表面积分析仪（BET）和傅里叶变换红外光谱（FT-IR）测量对制备的吸附剂进行了表征。使用4.0 mL 1.0 mol L⁻¹硝酸洗脱吸附络合物中的金属含量。考察了分析参数（包括pH值、固相量和洗脱液条件）以及基体离子对分析物保留的影响。通过分析有证标准物质对所提方法的准确度和精密度进行了测试。铜（II）、镉（II）、镍（II）和铬（III）离子的检测限（3Sb/m，N = 8）分别为0.22、0.11、0.27和0.15 μg L⁻¹，最大预富集因子为200。该方法已成功应用于各类水样、食品及其他样品中这些痕量有毒金属的评估。
