改性活性炭富集-FAAS法测定粮食中的痕量铜  

Detection of trace copper in cereal grains by flame atomic absorption spectrometry using modified activated carbon

作　　者：李英杰[1] 侯广顺[2] 闻小涛 柴朋举 

机构地区：[1]河南理工大学物理化学学院,河南焦作454000 [2]河南理工大学资源与环境学院,河南焦作454000

出　　处：《河南理工大学学报（自然科学版）》2016年第1期78-82,共5页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(41003015);河南省教育厅自然科学研究计划项目(2011B150010);河南理工大学博士基金资助项目(B2008-26);河南理工大学教育教学改革研究项目(2012JG077)

摘　　要：为测定粮食中的痕量铜,合成了活性炭负载十二烷基磺酸钠(SDS-AC)固相萃取材料,提出了微柱富集和火焰原子吸收光谱(FAAS)联用测定粮食中痕量铜的方法,基于SDS-AC具有负电性质的表面和阳离子交换特性,吸附的Cu^(2+)采用稀硝酸溶液(1.0 mol/L)洗脱并用FAAS检测。在最优条件下,检出限为0.62 ng/m L,相对标准偏差(RSD)为3.8%(c=60 ng/m L,n=7)。该方法简便、安全、低成本、选择性好,可准确测定标准参考物(GBW10010)、粮食等样品中痕量铜的含量。In oeder to detect trace copperin cereal grains,sodium dodecyl sulfonate（ SDS）-modified activated carbon（ SDS-AC） has been prepared and employed as a sorbent,and a new method using SDS-AC microcolumn combined with flame atomic absorption spectrometry（ FAAS） has been described for the determination of trace Cu. The method based on Cu^2＋was quantitatively retained by SDS-AC sorbent,which entailed cation exchange property and negative charged surface. And the retained Cu^2＋was effectively recovered with elution by 1. 0 mol / L HNO_3,and the eluent is quantified by FAAS. Under the optimized conditions,the limit of detection（ LOD） for Cu^2＋was 0. 62 ng / mL with the consumption of 10. 0 mL sample solution. The relative standard deviation（ RSD） for seven replicate measurements of 60 ng / mL Cu^2＋was 3. 8%. The method is characterized with simplicity,safety,low cost,selectivity,and adapts to the determination of copper in standard reference material（ GBW10010） and cereal grains.

关 键 词：十二烷基磺酸钠 活性炭 火焰原子吸收光谱 粮食样品 

分 类 号：R155.51[医药卫生—营养与食品卫生学]