Abstract：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 Cu²⁺was quantitatively retained by SDS-AC sorbent,which entailed cation exchange property and negative charged surface. And the retained Cu²⁺was effectively recovered with elution by 1. 0 mol / L HNO₃,and the eluent is quantified by FAAS. Under the optimized conditions,the limit of detection( LOD) for Cu²⁺was 0. 62 ng / m L with the consumption of 10. 0 m L sample solution. The relative standard deviation( RSD) for seven replicate measurements of 60 ng / m L Cu²⁺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.

Keyword：sodium dodecyl sulfonate;activated carbon;flame atomic absorption spectrometry;cereal grains;