【摘要】 在石油天然气工业中，常常使用价格昂贵的银盐来测定各类水中的Ｃｌ和ＣＯＤＣｒ。为了降低分析成本和防止污染环境，文中介绍了将含银废液在ｐＨ≈３ 时用ＡｇＣｌ 沉淀法分离富集银，然后用铁或铜还原法生成金属银，再用Ｈ２Ｏ２－ ＨＮＯ３ 法制备ＡｇＮＯ３ ，用（ＮＨ４）２ＳＯ４ 法或浓Ｈ２ＳＯ４ 法制备Ａｇ２ＳＯ４ 的方法。实验证明，制备的银盐纯度可达９９ ％ 以上，完全可以作为分析试剂循环使用，简便实用，可以大大降低测定Ｃｌ－ 和ＣＯＤＣｒ的成本。更多还原

【Abstract】 Chloride ion(Cl -) and COD Cr is often determined by using of expensive silver salt such as AgNO 3 or Ag 2SO 4. A simple and practical method of recovering silver salt from silver-bearing waste liquid has been discussed. in which the silver was separated and enriched by using setting method (pH≈3), the metal silver was produced by Fe-Cu reduceing method, AgNO 3 was prepared by H 2O 2-HNO 3 method, and Ag 2SO 4 was prepared by (NH 4) 2SO 4 or H 2SO 4 method. Results have shown that the pureness of the recovered silver slt is up to 99 % and the cost of measuring Cl - and COD Cr is decreased.更多还原