回收氯化银中银含量的测定方法  

Determination of Silver Content in Recycling Silver Chloride

作　　者：牛学军 

机构地区：[1]张家口市第一中学,河北张家口075000

出　　处：《广东化工》2013年第6期67-68,56,共3页Guangdong Chemical Industry

摘　　要：以浓硫酸与氯化银在加热条件下反应，将氯化银转化为溶解度较大的硫酸银，而后采用佛尔哈德法定墩分析氯化银中的银含量。当取样量为0．4-0．6g，需要浓硫酸用量为4cm^3，铁铵矾指示剂为10d，用0．1000mol／L的硫氰酸钾标准滴定溶液滴定，即可准确分析氯化银中的银含量。滴定时，将三角烧瓶置于磁力搅拌器上，防止AgSCN吸附A矿离子，近终点时振摇保持30s至溶液出现微红色不退即为终点。By means of reaction between silver chloride and concentrated sulfuric acid under in the heating conditions, the silver chloride changes into sih,cr with higher solubility in water, and then Volhard＇s method can be used tbr determing quantitatively the silver content in silver chloride. When sampling quantity of AgCI was 0.4 to 0.6 grams, needing to add 4 cm3 concentrated sulfuric acid, 10 d iron ammoniumalum indicator, accurate analysis of the silver content in silver chloride can be analyzed with 0.1000 mol/L potassium thiocyanate standard titration solution. The conical flask was placed on the magnetic magnetic stirrer while titrating in order to prevent AgSCN from adsorbing Ag＋ ions. The red of solution keeping in 30 seconds near the end of the titration indicate the titration end-point.

关 键 词：氯化银 银含量分析 佛尔哈德法 硫酸铁铵指示剂 

分 类 号：O65[理学—分析化学]