首页> 外文期刊>Arabian Journal for Science and Engineering >DETERMINATION AND PRECONCENTRATION OF NICKEL IN WATER WITH FLAME ATOMIC ABSORPTION SPECTROMETRY BY THIOUREAFORMALDEHYDE AS CHELATING RESIN
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DETERMINATION AND PRECONCENTRATION OF NICKEL IN WATER WITH FLAME ATOMIC ABSORPTION SPECTROMETRY BY THIOUREAFORMALDEHYDE AS CHELATING RESIN

机译:硫脲醛乙醛火焰原子吸收光谱法测定和富集水中镍。

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Thiourea-formaldehyde chelating resin is synthesized simply and rapidly from thiourea and formaldehyde by condensation polymerization and characterized by IR spectra and studied for the preconcentration and determination of trace Ni (Ⅱ) ion from solution samples. The optimum pH value for sorption of the metal ion was 6.5. The sorption capacity of resin for Ni (Ⅱ) was determined. The chelating resin can be reused for 20 cycles of sorption-desorption without any significant change in sorption capacity. A recovery of 96% was obtained for the metal ion with 0.5 M HNO_3 as eluting agent. The equilibrium adsorption data of Ni (Ⅱ) on modified resin were analyzed by Langmuir, Freundlich, and Temkin models. Based on equilibrium adsorption data, the Langmuir, Freundlich, and Temkin constants were determined to be 0.045,0.022, and 0.133 at pH 6.5 and 20 ℃. The method was applied for nickel ion determination from a river water sample.
机译:硫脲和甲醛通过缩聚反应简单,快速地合成了硫脲-甲醛螯合树脂,并通过红外光谱对其进行了表征,并研究了溶液中痕量镍(Ⅱ)离子的富集和测定。吸附金属离子的最佳pH值为6.5。测定了树脂对Ni(Ⅱ)的吸附能力。螯合树脂可重复使用20个吸附-解吸循环,而吸附能力没有任何显着变化。用0.5 M HNO_3作为洗脱剂,金属离子的回收率达到96%。用Langmuir,Freundlich和Temkin模型分析了Ni(Ⅱ)在改性树脂上的平衡吸附数据。根据平衡吸附数据,在pH 6.5和20℃下,Langmuir,Freundlich和Temkin常数确定为0.045、0.022和0.133。该方法用于测定河水样品中的镍离子。

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