APPLICATION OF DIFFERENTIAL-PULSE ANODIC-STRIPPING VOLTAMMETRY WITH ASTOPPED-FLOW SYSTEM FOR THE SIMULTANEOUS DETERMINATION OF PB, CU, SB,AND BI IN ENVIRONMENTAL-SAMPLES

Cu(II), Sb(III), Bi(III) and Pb(II) were cathodically deposited to a h anging mercury drop electrode (HMDE) from a 1.0 M HCl medium in a flow cell followed by quantification by differential pulse anodic strippin g voltammetry (DPASV) in a malonic acid I HCl stripping medium. Well-d efined peaks were observed and peak separation of Delta E(p) > 80 mV w as achieved for the four metals. This method has been applied successf ully to the analysis of environmental water samples. Recovery of 100 /- 7 % was obtained at 10(-8) -10(-9) M levels and detection limits we re at the level of 10(-10) M.