Determination of Trace Metals in Water Samples by Flame Atomic Absorption Spectrometry using Column Solid-Phase Extraction

摘要

Novel and sensitive method exploiting solid-phase extraction (SPE) was developed for the determination of Co,Cu,Ni,Zn and Cd in water samples.Sodium diethyldithio-carbamate (Na-DDC) is impregnated with activated carbon has been used in this preconcentration technique.At pH 4.5 these trace metal ions were quantitatively sorbed and eluted with 1 M nitric acid in acetone solution at a flow rate of 1.5 mL min~(-1) The effects of sample volume,volume of eluent and recovery have been investigated.The developed method was applied to the determination of trace metal ions with satisfactory results.The reliability of the procedures has been verified by analyzing standard reference materials.Results obtained are in good agreement with the certified values and the relative standard deviations.