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许多分析实验室、电镀厂、胶卷厂、肉类加工厂在生产过程中总会有大量氯化银(包括溴化银和氰化银,废渣生成。回收其中的银,以抗坏血酸为还原剂,效果好,程序简便,快速,而且能定量回收。选择抗坏血酸为还原剂的理论依据是:由于银离子的标准还原电位是+0.8伏,而抗坏血酸在 pH 4和 pH 7时的氧化还原电位分别是0.127伏和0.34伏,所以,在 pH 4～7的范围内,用抗坏血酸来还原银离子是完全有效的,实验结果也证明了这一点。
Many analytical laboratories, electroplating factories, film factories, meat processing plants in the production process there will always be a large number of silver chloride (including silver bromide and silver cyanide, waste generated. Recycling the silver, ascorbic acid as a reducing agent, The effect is good, the procedure is simple and fast, and can be quantitatively recovered.The theoretical basis for choosing ascorbic acid as a reducing agent is that since the standard reduction potential of silver ions is +0.8 volts, the redox potentials of ascorbic acid at pH 4 and pH 7 are 0.127 volts and 0.34 volts, so the reduction of silver ions with ascorbic acid is completely effective in the pH range of 4 to 7. The experimental results also prove this point.