Venkatesh Gopalan, Singh Ajai K
Department of Chemistry, Indian Institute of Technology, New Delhi 110016, India.
Talanta. 2005 Jul 15;67(1):187-94. doi: 10.1016/j.talanta.2005.02.017. Epub 2005 Mar 19.
2-{[1-(3,4-Dihydroxyphenyl)methylidene]amino}benzoic acid (DMABA) was loaded on Amberlite XAD-16 (AXAD-16) via azo linker and the resulting resin AXAD-16-DMABA explored for enrichment of Zn(II), Mn(II), Ni(II), Pb(II), Cd(II), Cu(II), Fe(III) and Co(II). The optimum pH values for extraction are 6.5-7.0, 5.0-6.0, 5.5-7.5, 5.0-6.5, 6.5-8.0, 5.5-7.0, 4.0-5.0 and 6.0-7.0, respectively. The sorption capacity was found between 97 and 515mumolg(-1) and the preconcentration factors from 100 to 450. Tolerance limits for foreign species are reported. The kinetics of sorption is fast as t(1/2) is </=5min. The chelating resin can be reused for 50 cycles of sorption-desorption without any significant change (<1.5%) in the sorption capacity. The limit of detection values (blank +3s) are 1.12, 1.38, 1.76, 0.67, 0.77, 2.52, 5.92 and 1.08mugL(-1) for Zn(II), Mn(II), Ni(II), Pb(II), Cd(II), Cu(II), Fe(III) and Co(II), respectively. The enrichment on AXAD-16-DMABA coupled with monitoring by flame atomic absorption spectrometry (FAAS) is used to determine all the metal ion ions in river and synthetic water samples, Co in vitamin tablets and Zn in milk samples.
通过偶氮连接体将2-{[1-(3,4-二羟基苯基)亚甲基]氨基}苯甲酸（DMABA）负载到Amberlite XAD-16（AXAD-16）上，所得树脂AXAD-16-DMABA用于富集锌（II）、锰（II）、镍（II）、铅（II）、镉（II）、铜（II）、铁（III）和钴（II）。萃取的最佳pH值分别为6.5 - 7.0、5.0 - 6.0、5.5 - 7.5、5.0 - 6.5、6.5 - 8.0、5.5 - 7.0、4.0 - 5.0和6.0 - 7.0。吸附容量在97至515μmol g⁻¹之间，预富集因子在100至450之间。报告了外来物种的耐受限度。吸附动力学很快，半衰期t(1/2)≤5分钟。螯合树脂可重复使用50次吸附 - 解吸循环，吸附容量无任何显著变化（<1.5%）。锌（II）、锰（II）、镍（II）、铅（II）、镉（II）、铜（II）、铁（III）和钴（II）的检测限（空白+3s）分别为1.12、1.38、1.76、0.67、0.77、2.52、5.92和1.08μg L⁻¹。AXAD-16-DMABA上的富集与火焰原子吸收光谱法（FAAS）监测相结合，用于测定河流和合成水样中的所有金属离子、维生素片中的钴以及牛奶样品中的锌。
