析相微萃取-分光光度法测定农产品中痕量铁  

Determination of Trace Iron in Agricultural Products by Microsphere Phase Separation Extraction-Spectrophotometry

作　　者：刘国霞[1] 尹继颖[2] 赵翠翠[1] 张长花[1] 王彩红[1] 

机构地区：[1]滨州学院化学与化工系,山东滨州256603 [2]北京化工大学化学工程学院,北京100029

出　　处：《湖北农业科学》2011年第17期3622-3624,共3页Hubei Agricultural Sciences

基　　金：山东省滨州学院青年人才创新基金项目(BZXYQNLG200825);山东省滨州学院青年项目(BZXYLG200504)

摘　　要：采用1-(2-吡啶偶氮)-2-萘酚(PAN)为络合剂,三氯甲烷为萃取剂,乙醇为助溶剂,建立了析相微萃取-分光光度法测定农产品中痕量铁的分析方法。考察了影响络合反应和相分离的各种条件及共存离子的干扰。在最优的实验条件下,铁质量浓度在0.02～0.50μg/mL时与吸光度呈线性关系,方法的检出限为0.01μg/mL,对铁浓度为0.10μg/mL的样品溶液进行7次平行测定,相对标准偏差为2.68%。该方法用于农产品中痕量铁测定,回收率在95.8%～102.9%之间。A new method for the determination of trace iron in agricultural products by microsphere phase separation extraction-spectrophotometry with was developed,with the existence of cosolvent of ethanol,extraction solvent of trichloromethane,and complexing agent of 1-（2-pyridylazo）-2-naphthol（PAN）.Various conditions influencing complexing reaction and phase separation were optimized.And the interference of coexistenceion was studied.Under the optimized experimental conditions,there was a linear relationship between absorbance and iron concentration in the range of 0.02～0.50 μg/mL.The detection limit of this method was 0.01 μg/mL.The RSD was 2.68% for seven determination of 0.10 μg/mL iron.This method had been applied to the determination of trace iron in agricultural products with the recovery rate of 95.8% to 102.9%.

关 键 词：析相微萃取 分光光度法 痕量铁 农产品 

分 类 号：O655.25[理学—分析化学] O657.31[理学—化学]