Document Type: Research Paper
A preconcentration/separation procedure is presented for the solid phase extraction
of trace cadmium and lead ions as their 2-propylpiperidine-1-carbodithioate (PPCD) chelates in
environmental samples on Nano Graphene, prior to cadmium and lead determinations by atomic
absorption spectrometry. The preconcentration procedure was optimized by using model solutions
containing cadmium and lead ions. The influences of pH of the model solutions, amounts of PPCD,
eluent type and volume etc. were investigated. Also the effects of the matrix constituents of the samples
were also examined. Separation of cadmium and lead from real samples was achieved quantitatively.
The procedure presented was checked with the analysis of standard reference materials (IAEA-336
Lichen and SRM 1515 Apple leaves). The preconcentration procedure was applied for the lead and
cadmium contents of the natural water samples, some salts with satisfactory results (recoveries >95%,
relative standard deviations <7%).