摘要：
研究了在Cd(Ⅱ)离子印迹聚合物分离富集后,用火焰原子吸收分光光度法测定水中痕量镉的方法.首先采用悬浮聚合技术,以甲基丙烯酸(MAA)为功能单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,合成了Cd(Ⅱ)离子印迹聚合物,采用静态和动态方法对其吸附水溶液中Cd(Ⅱ)的影响因素进行了系统研究.结果表明,Cd(Ⅱ)离子印迹聚合物对水溶液的Cd(Ⅱ)具有很好的选择识别性能,而且具有快速的吸附动力学性质,吸附在20min内即达到平衡.常见的金属离子不干扰测定,相对标准偏差为4.88%,检出限(3σ)为0.76μg/L.将该方法用于实际水样的测定,结果令人满意.
关键词:
镉,
离子印迹聚合物,
分离富集,
火焰原子吸收分光光度法
Abstract:
The determination of trace cadmium in the sample of environment by flame atomic absorption spectrometry after separation and preconcentration by Cd（Ⅱ）-ion imprinted polymers has been developed.Initially, Cd（Ⅱ）-ion imprinted polymers is synthesized by suspension polymerization with methacrylate（functional monomer） and ethylene glycol dimethacrylate（crosslinking monomer）.The effect of various factors on Cd（Ⅱ） adsorption from aqueous solution is investigated by static state and dynamic state methods.The results show that Cd （Ⅱ ）-ion imprinted polymers has specific recognition ability for Cd （Ⅱ） from aqueous solution.Besides, the imprinting polymer possesses a fast binding kinetics and the times of adsorption equilibration is about 20 min.The precision and detection limit （3σ） of the method are 4.88% and 0.76 μg/L, respectively.The method can be used for determining the trace amount of cadmium in water samples with satisfactory results.
Key words:
cadmium,
ion-imprinted polymers,
separation and preconcentration,,
flame atomic absorption spectrometry
中图分类号:
王丽敏, 周美华, 宫建龙, 袁静超, 陈燕波. 水中痕量镉的高灵敏检测方法研究[J]. 工业水处理, 2009, 29(8): 75-77.
Wang Li-min, Zhou Mei-hua, Gong Jian-long, Yuan Jing-chao, Chen Yan-bo. Study on the highly sensitive determination of trace cadmium in water[J]. INDUSTRIAL WATER TREATMENT, 2009, 29(8): 75-77.