Preconcentration and Separation of Trace Amounts of Zn, Ni, Co Ions in Water Samples Using Eriochrome Red B/amberlyst A-26 Composite as Sorbent Before Determination By Flame Atomic Absorption Spectrometry

Abstract

The properties of the composite prepared from Amberlyst A-26 modified with Eriochrome Red B were investigated. The composite was characterized by FTIR and UV-VIS and used to preconcentrate Zn, Co, and Ni ions. Various parameters such as the distribution coefficient and sorption capacity of the composite, pH and flow rates of uptake and stripping, and the volume of the sample and eluent were evaluated. The effects of electrolytes and cations on preconcentration were studied. The recoveries of Zn, Co, and Ni ions were 98%. The method was validated by standard addition and polarographic analyses and used for the preconcentration of Zn, Ni, and Co in water samples and subsequent determination by flame atomic absorption spectrometry (FAAS) with satisfactory results. The 3s detection limits for Zn, Co, and Ni were 0.54, 0.28, and 0.39 hg l-1, respectively, and the relative standard deviation of 10 replicate measurements was less than 5%.