A two step anodic stripping voltammetry of a single sample of water which has been made 0.1Nin HC104, is useful for simultaneously detecting Hg+2, Zn+2, Cd+2, Pb+2, Cu+2, Co+2and Ni+2. In the first step mercury is determined by deposition onto a bare glassy carbon electrode (GCE) with subsequent stripping, and in the second step the remainder of the metal ions above are sought by deposition onto a mercury plated GCE and subsequent stripping. With a deposition time of 72.82 min the detection sensitivity varies from about 0.2 ppb for cobalt to about 10 ppb for zinc. Silver, tin and chloride were found to be interferences in the detection of some of the metal ions.