纳米氧化镁分离富集-火焰原子吸收光谱法测定水样中痕量铜、镍、锌

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

摘要: 提出了纳米氧化镁吸附富集铜、镍和锌,稀乙酸作洗脱剂洗脱,火焰原子吸收光谱法测定水样中痕量铜、镍和锌的方法.在优化的试验条件下,纳米氧化镁对铜、镍、锌的吸附容量分别为8.4,9.6,8.7 mg·g-1;铜、镍、锌的检出限(3σ)分别为5.4,7.3,4.1 μg·L-1,相对标准偏差(n=10)依次为3.5%,4.8%,4.4%.方法用于水样中铜、镍和锌含量的测定,回收率在96%~103%之间.

Abstract: 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%.