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Preconcentration of erbium(III) ions from environmental samples using activated carbon modified with benzoyl hydrazine |
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| Authors: | Qihui Wang Xijun Chang Zheng Hu Dandan Li Ruijun Li Xiaoli Chai |
| Institution: | 1. Department of Chemistry, Lanzhou University, Lanzhou, 730000, People??s Republic of China 2. Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou, 730000, People??s Republic of China |
| Abstract: | A method was established for the preconcentration of trace concentrations of Er(III) ion using activated carbon modified with benzoyl hydrazine. Parameters affecting solid-phase extraction such as pH value, shaking time, flow rate, sample volume were systematically studied. At a pH of 3.0, the maximum static adsorption capacity of the sorbent is 59.8?mg?g?1 for Er(III), and the time for quantitative adsorption (>95%) is as short as 2?min. The adsorbed Er(III) was quantitatively eluted with 2?mL of 1.0?M hydrochloric acid and then determined by inductively coupled plasma optical emission spectrometry. The limit of detection (3??) is 73?ng?g?1, and the relative standard deviation is <2.0% (n?=?8). The method was validated by analyzing certified reference materials and successfully applied to the determination of trace Er(III) in environmental samples. Activated carbon modified with benzoyl hydrazine (AC-BH) has been used for preconcentration of Er(III) ion. Parameters affecting solid-phase extraction were systematically studied. The important characteristics of AC-BH are its excellent adsorptive selectivity towards Er(III) over other ions, short extraction time, high adsorption capacity and high enrichment factor. |
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