Performance of selected destruction methods for the determination of heavy metals in reed plants (Phragmites australis)

摘要

The aim of this study was to assess the perfomance of selected destriction methods fro the determination of heavy metals in reed plants (Phragmites australis(Cav.)Tin.ex Steudel).Homogenised sample of stems and leaves were subjected to siz destruction method and analysed for Cd,Cu,Pb,Zn,Ni,Cr,Fe and Mn.A microwave destruction procedure yielded the best overally recoveries.An overnight destructuring with HNO_3 and a destruction usign HNO_3 and H_2O_2 yielded Cd,Cu,Pd,Zn,Fe and Mn revoversies which could be accepatble for some purposes.For these elements both mthods could be used as relatively cheap,easy and fast subsitutes for mirowave destruction.A destruction using HNO_3 and HCLO_4 is not recommended for the deetermination of Pb in reed plants,whereas dry ashing procedures were suitable for none of the elements.For the determination of Ni and Cr in reed plant material,microwave destruction app;eared the only acceptabel method.Heavy methal analysis of reed plants significantly depends upon the destruction procedure used.There is a ned for certified reference reed samples for quality control.