键合4-(2-吡啶偶氮)-间苯二酚螯合树脂分离富集-火焰原子吸收法测定蔬菜中痕量镉(Ⅱ)  

Separation and Preconcentration of Trace Cadmium from Vegetables with 4-(2-Pyridylazo)-resorcinol Immobilized on Amberlite XAD-4 Prior to Determination by Flame Atomic Absorption Spectrometry

作　　者：李文山[1] 周方钦[1] 刘琳[1] 屈东方[1] 

机构地区：[1]湘潭大学化学学院,环境友好化学与应用省部共建教育部重点实验室,湖南湘潭411105

出　　处：《分析科学学报》2012年第4期531-534,共4页Journal of Analytical Science

摘　　要：本文合成了Amberlite XAD-4键合4-(2-吡啶偶氮)-间苯二酚螯合树脂,并考察了其对痕量镉(Ⅱ)的吸附性能。探讨了溶液pH、洗脱剂和干扰离子等对镉(Ⅱ)分离富集的影响。树脂吸附容量为4.7mg/g,吸附的镉(Ⅱ)用5mL 2mol/L HNO3乙醇溶液洗脱,火焰原子吸收法测定。在最佳实验条件下,回收率为94.4%～97.9%,相对标准偏差在1.7%～2.7%之间。方法可用于蔬菜中镉(Ⅱ)的测定。A new method for the determination of trace Cd（Ⅱ） based on Amberlite XAD-4 bonded with 4-（2- pyridylazo）resorcinol adsorption with flame atomic absorption spectrometry （FAAS） was proposed. In this process, the effects of pH, elution agent, interfering ions and other experimental conditions on separation and preconcentration of trace Cd（ Ⅱ） were studied. Adsorption capacities of the resin was 4.7 mg/g. The adsorbed Cd（ Ⅱ ） on the resin could be completely eluted with 5 mL of 2 mol/L HNO3 ethanol solution and then determined by FAAS. Under the optimum conditions, the recoveries were in the range from 94.4% to 97.9% ,and relative standard deviations was applied for the determination of trace Cd（ Ⅱ ） were between 1.7 % and 2.7 %. The proposed method in vegetable with satisfactory results.

关 键 词：螯合树脂 分离富集 吸附 镉(Ⅱ) 火焰原子吸收光谱法 

分 类 号：O657.31[理学—分析化学]