prov:value
| - The metal scavenger of this invention can scavenge metal ions such as mercury, cadmium, lead, zinc, copper, chromium (VI), arsenic, gold, silver, platinum, vanadium and thallium as efficiently as or more efficiently than conventional metal scavengers and moreover, can also efficiently scavenge metal ions whose scavenging is difficult by the conventional metal scavengers, such as chromium (III), ni
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