中文摘要：

以胞外高聚物PF-2作为镍的分离富集新材料,利用扫描电镜（SEM）、X射线能量色散分析仪（EDX）和傅里叶变换红外光谱（FTIR）对其进行表征。以火焰原子吸收法为检测手段,研究了胞外高聚物PF-2对水中Ni（Ⅱ）的吸附性能。结果表明：在pH 5.0,此吸附剂对水中的Ni（Ⅱ）具有很强的吸附能力。高聚物PF-2对Ni（Ⅱ）的吸附较易进行,吸附等温线能较好地用Langmuir模型来描述,最大吸附容量为33.5 mg/g。被吸附的Ni（Ⅱ）可用0.5 mol/L HCl定量洗脱。本方法线性范围0.05～2.0 mg/L;检出限为48μg/L;对80 mg/L Ni（Ⅱ）溶液平行测定9次,RSD为2.6%。本方法已成功地应用于环境样品中痕量镍的测定。

英文摘要：

A new exopolymers PF-2 was prepared for separation-preconcentration of trace nickel,and characterized using scanning electron microscope（SEM）,energy dispersive X-ray spectrometry（EDX） and Fourier transform infrared spectrophotometry（FTIR）.By means of the determination of flame atomic absorption spectrometry（FAAS）,the adsorption behavior of exopolymers PF-2 for nickel ions was investigated.The results showed that at the optimum pH 5.0,the Langmuir isotherm fitted well with the experimental equilibrium data,and maximum monolayer adsorption capacity was 33.50 mg/g.The adsorption kinetics data fitted very well to pseudo second-order model.The adsorbed Ni（Ⅱ） could be quantitatively eluted using 0.5 mol/L HCl.A linear response of nickel was obtained in the range of 0.05-2.0 mg/L with a detection limit of 48 μg/L.Under optimum conditions,the relative standard deviation（RSD） was 2.6%（n=9,c=0.08 mg/L）.The proposed method has been applied to determine trace nickel in environmental samples with satisfactory results.