FAAS Determination of Trace of Cu Ni and Zn in Water Sample After Separation and Enrichment by MgO Nanoparticle

Trace amounts of Cu,Ni and Zn in water sample were absorbed and enriched on the surface of MgO nanoparticle,and desorbed from the nanoparticle by eluting with dil. HOAc (2+98). The solution obtained was used for FAAS analysis. Under the optimum conditions,the absorption capacity of MgO nanoparticle toward Cu,Ni and Zn was found to be 8.4,9.6,8.7 mg·g-1. The values of detection limits (3σ) of this method for Cu,Ni and Zn were 5.4,7.3,4.1 μg·L-1,and RSD′s (n=10) were 3.5%,4.8%,4.4%,respectively. The proposed method was applied to the determination of trace amounts of Cu,Ni and Zn in water samples,giving the values of recovery in the range of 96%-103%.