中文摘要：

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/mL,相对标准偏差（RSD）为3.8%（c=60 ng/mL,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。

英文摘要：

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.