SIMULTANEOUS DETERMINATION OF 7 TOXIC TRACE AND OR ULTRATRACE METALS IN ENVIRONMENTAL PLANTS BY DIFFERENTIAL-PULSE VOLTAMMETRY WITHOUT CHANGE OF SOLUTION AND ELECTRODE/

A simple and reliable procedure simultaneously to determine seven trac e and/or ultratrace toxic metals in a single sample of environmental p lants has been presented. The procedure is based on the simultaneous d etermination of Cu, Pb and Cd by differential pulse anodic stripping v oltammetry, of Zn and Mn by differential pulse voltammetry and of Ni a nd Co by differential pulse adsorption voltammetry at the hanging merc ury drop electrode. The details of sampling washing and drying of samp les and the approach of digestion and preparation of samples for volta mmetric determination have been investigated. The method has been appl ied to determination of the seven metals in grass and hucerne from dif ferent environments.