PVC-PP树脂分离富集/火焰原子吸收光谱法测定海水中痕量铜镍钴

Determination of Trace Copper,Nickel and Cobalt in Sea Water by Flame Atomic Absorption Spectrometry after Preconcentration with Polyvinyl Chloride-Polyethylene Polyamine Resin

采用自制的聚氯乙烯多乙烯多胺（PVC-PP）树脂，在pH值为5．0的条件下，分离富集海水中的痕量铜、镍、钴，以1．2mol／L盐酸溶液洗脱．火焰原子吸收光潜法测定，富集倍数最大可达100倍（回收率大于90％）。研究了吸附与洗脱的最佳条件，方法检出限分别为铜0．81μg/L、镍0．98μg/L、钴0．57μg/L（富集倍数100，S／N=3），相对标准偏差小于5％（n=7），样品加标回收率在90％-105％之间。

The home-made polyvinyl chloride- polyethylene polyamine（PVC -PP） resin was used to separate trace copper, nickel and cobalt from the matrix elements in sea water. The preconcentrated trace elements were eluted with 1.2 mol/L HCl and subsequently determined by flame atomic absorption spectrophotometry. A concentration of 100 times could be attained. The detection limits were 0.81μg/L, 0. 98μg/L and 0. 57μg/L for copper, nickel and cobalt, respectively. The relative standard deviations for the elements ranged from 2. 3% to 5.0% （n = 7） and the spiked recoveries ranged from 90% - 105%.