The possibility of calibration-less determination of trace concentrations o
f some electrochemically active elements such as Ag, As, Cd, Hg, Pb, etc, b
y flow-through coulometry is described. The analyte species are collected q
uantitatively from the flowing sample solution on a porous working electrod
e made of vitreous carbon particles set at either a constant potential orc
The deposit is stripped by a constant current in the next step and the corr
esponding electrical charge is measured and evaluated. The analyte concentr
ation is calculated by making use of the combined Faraday's laws of electro
lysis. The method exerts detection limits about 1 mug/l or lower and a line
ar concentration range over 3 orders of magnitude.