The blast furnace granulated slag when treated with a solution of silv
er nitrate indicates a shiny deposition of metallic silver showing its
capacity to cause electrochemical reduction. The major and minor comp
onents of the slag have been determined. The capacity of the slag to c
ause chemical reduction has been attributed to the presence of certain
reactive metals in their elemental states. Alkyllead, in gasoline or
aqueous system, when treated with the blast furnace granulated slag is
found to be substantially or completely removed depending on the cond
itions of the treatment. The method has been found simple, economical
and useful for the treatment of alkyllead-contaminated aqueous systems
.