Determination of multi-valent metal contamination and system for removal of multi-valent metal contaminants from water

1. Field of the Invention A test for determining the presence of multi-valent metal contaminants, such as arsenic, mercury and chromium, when present in certain valence states and a system for removal of these contaminants from water. Multi-valent metal salts, for example, Cr, which are highly toxic, can be detected and potentially removed from water through a redox reaction by reaction with iron or cobalt salts to obtain a reductive elimination of the Crby conversion to Cr. The determination may be in the form of a test, such that a tableted composition can be introduced into water for reduction of a metal salt, such as Crto Crin order to provide a visual indication thereof. The system for the conversion of Cror other reducible metal salts to other lower valence states having less toxicity would rely upon introduction of a metal salt in the form of a reducing agent which would be introduced into the water allowing for a reduction/oxidation action to take place. This would be followed by removal of the flocculated/precipitated reduced contaminant metal salt and by re-reduction of the oxidized reducing agent.