苯甲醇作为佛尔哈得法保护剂的研究

Benzyl Alcohol:The Protective Agent of Volhard Method

提出了以苯甲醇作为佛尔哈德法间接滴定氯离子的保护剂 ,并与以硝基苯、正辛醇作保护剂进行了比较 ,结果表明 :苯甲醇保护效果显著 ,对氯化银沉淀有良好的凝聚作用 ,滴定终点变色敏锐 ,易于观察 ,本法精密度及准确度均高于硝基苯法 .且苯甲醇无毒无刺激性气味 。

A new method with Benzyl alcohol as the protective agent of Volhard method is proposed in this paper,and is contrasted with nitrobenzene method. The results indicate that benzyl alcohol is an effective protective agent which can conglomerate silver chloride precipitate effectively. The terminal point of titration has acute color changing which is easy to watch. This method has higher precision and accuracy more than nitrobenzene method. What's more,benzyl alcohol is nontoxic and has no irritant smell,so it is environmentally benign.