| 摘要 |
PURPOSE:To make mercury insoluble and nontoxic by ionizing, mercury together with an oxidizing agent at <=4 pH, and allowing the ionized mercury to contact with piperidine dithiocarbamic acid or thiazadithiocarbamic acid, etc. by maintaining the pH at 4-5. CONSTITUTION:Mercury is ionized by the oxidative decomposition at <=4 pH in the presence of an oxidizing agent such as an alkali metal hypochlorite, e.g. sodium hypochlorite, hypochlorous acid, or H2O2. In this case, 50-200ppm oxidizing agent is preferred to be used per 1ppm-Hg. The pH is then adjusted and maintained at 4-5 by the addn. of alkali such as caustic alkali, and 0.5-3mol piperidine dithiocarbamic acid or its salt, or thiazadithiocarbamic acid or its salt is allowed to contact with 1g ionized Hg to insolubilize to nontoxify Hg.
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