Porous Spherical Celiulose Preenrichment for Determination of Cu by Flame Atomic Absorption Spectrometry

The pH of the sample was adjusted to 6.9,the Cu2+ in the sample was then preconcentrated online with flow injection system on column packed with Porous spherical cellulose,eluted 0.l mol/L-1 nitric acid,measured with flame AAS online.At pH 6.9,the reaction time for preconcentration was 90 s at flow rate of 2.5mL/min,then eluted at 2.0 mL/min with 0.1mol/L nitric acid for FAAS determination.The precision for four replicate determinations of 5μg/L-1 Cu2+ standard solution was 0.25%(RSD).The concentration of the Cu2+ in the sample was enriched for 28 times with the process.