flame atomic absorption spectrometric determination of cd(ii), zn(ii) and ag(i) in different matrixes after solid phase extraction on sodium dodecyl sulfate (sds)-coated alumina as their 2,3 di hydro 2,3 para tolyl qinazoline (1 h)- 4 one (dptqo)

a sensitive and selective solid phase extraction procedure for the determination of traces of cd(ii),zn(ii) and ag(i) ions has been developed. an alumina-sodium dodecyl sulfate (sds) coated on with2,3 di hydro 2,3 para tolyl qinazoline (1 h)- 4 one (dptqo). the influences of the analyticalparameters including ph and sample volume were investigated. common coexisting ions did notinterfere on the separation and determination of analytes under study. the adsorbed analytes weredesorbed by using 6ml of 4 mol l�1 nitric acid. the responses are linear 0.02–0.85 �g ml-1 for cd2+ion 0.01–0.90 �g ml-1 for zn2+ and 0.02–0.92 �g ml-1for ag+ detection limit for cd(ii), zn(ii) andag(i) ions were found to be 1.4, 1.3 and1.12 (ng ml-1), respectively. it was found that the recoveryfor cd2+, zn2+and ag+ ions were 97.7, 98.2 and 98.0 with rsd of 1.9, 1.8 and 1.7. it was alsoobserved that recovery for repeated recovery on the same solid phase not varies more than 3%. thepresented procedure was successfully applied for determination of analytes in radiology wastewater,amalgam, natural water and blood samples.