离子印迹聚合物分离富集——火焰原子吸收法测定环境水样中痕量镍

Preconcentration of Nickel in Environmental Water with Ion-Imprinted Polymer and Determination by Flame Atomic Absorption Spectrometry

制备了一种新型吸附材料-离子印迹聚合物,优化了对痕量Ni 2+的吸附与解吸条件.在pH=7.0、流速为4.0mL/min的条件下,离子印迹聚合物能定量吸附试液中的痕量Ni 2+,其动态饱和吸附容量为7.38mg/g.吸附在离子印迹聚合物上的Ni 2+可用5mL 1.0mol/L HCl完全洗脱.该方法的检出限为0.26μg/L,线性范围为0.1～5.0μg/mL,相对标准偏差为1.91%(1.0μg/mL Ni 2+),方法用于环境水样中痕量镍的测定,结果满意.

In this paper, ion-imprinted polymer as a new sorbent was synthesized. The conditions of ad- sorption and desorption for trace nickel were optimized. At pH 7.0 and flow rate 4.0 mL/min, nickel could be quantitatively adsorbed by ion-imprinted polymer, and the dynamic adsorption capacity was 7.38 mg/g. The adsorbed nickel could be eluted from the absorbent with 5 mL 1.0 mol/L HC1. The linear range was 0.15.0 /Lg/mL with a detection limit {3a, n =11） of 0.26/g/L. The RSD {n =7} for determination of 1.0 btg/mL Niz＋ was 1.91%. The method was applied in the determination of trace nickel in environment water with satisfactory results.