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首页> 外文期刊>Egyptian Journal of Chemistry >Rapid and Simple Spectrophotometric Determination of Mn(II), Fe(III), Co(II), Ni(II) and Cu(II) Ions in Natural Samples Using 2-(2-Hydroxynaphth-1-yIazo)-pyridine
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Rapid and Simple Spectrophotometric Determination of Mn(II), Fe(III), Co(II), Ni(II) and Cu(II) Ions in Natural Samples Using 2-(2-Hydroxynaphth-1-yIazo)-pyridine

机译:使用2-(2-羟基萘-1-咪唑)-吡啶快速简单地分光光度法测定自然样品中的Mn(II),Fe(III),Co(II),Ni(II)和Cu(II)离子

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摘要

THE medium effect on the electronic absorption spectra of 2-(2-hydroxynaph-1-ylazo)-pyridine (HL) was studied. 2-(2-hydroxynaph-1-ylazo)-pyridine has been found to be a good chromogenic reagent for determination of Mn(II), Fe(III), Co(II), Ni(II) and Cu(II) ions. In aqueous buffer solution of different pH values (2-12) containing 30 % (v/v) methanol-water, HL reacts with Mn(II), Fe(III), Co(II), Ni(II) and Cu(II) ions to form 1:1 and 1:2 (M:L) chelates. The formed complexes exhibiting absorption maxima at 580, 555, 577, 561 and 551 nm with apparent molar absorptivities 2.42 × 104, 0 58 × 104, 2.14 × 104, 4.54 × 104 and 2.09 × 104 (L mot~(-1) cm~(-1)) for Mn(II), Fe(III), Co(II), Ni(II) and Cu(II)-complexes, respectively. The optimum conditions (pH. time, temperature, reagent concentration, sequence of addition and solvent ratio) for chelates formation are studied. The spectrophotometeric analytical characteristics (linearity ranges, Ringbom ranges, stability constants and free energy changes) of the formed complexes are determined. Relatively large amounts of co-existing elements, including all other metals, can be tolerated The advantages of this method are: simple and rapid, with high sensitivity and good selectivity and was applied to the determination of the mentioned metal ions in natural samples with satisfactory results. Some solid HL-complexes are prepared and studied by different analytical and spectral techniques in order to investigate the mode of bonding in the formed complexes.
机译:研究了介质对2-(2-羟基萘-1-基偶氮)-吡啶(HL)电子吸收光谱的影响。已发现2-(2-羟基萘-1-基偶氮)-吡啶是测定Mn(II),Fe(III),Co(II),Ni(II)和Cu(II)离子的良好生色试剂。在含有30%(v / v)甲醇-水的不同pH值(2-12)的缓冲水溶液中,HL与Mn(II),Fe(III),Co(II),Ni(II)和Cu( II)离子形成1:1和1:2(M:L)的螯合物。形成的复合物在580、555、577、561和551 nm处显示最大吸收,表观摩尔吸收率2.42×104、0 58×104、2.14×104、4.54×104和2.09×104(L mot〜(-1)cm 〜(-1))分别表示Mn(II),Fe(III),Co(II),Ni(II)和Cu(II)配合物。研究了形成螯合物的最佳条件(pH,时间,温度,试剂浓度,添加顺序和溶剂比例)。测定形成的配合物的分光光度分析特性(线性范围,林邦范围,稳定性常数和自由能变化)。可以容许相对大量的共存元素,包括所有其他金属,该方法的优点是:简单,快速,灵敏度高,选择性好,可用于自然样品中上述金属离子的测定,令人满意结果。为了研究形成的配合物中的键合方式,制备了一些固体HL-配合物,并通过不同的分析和光谱技术对其进行了研究。

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