佛尔哈德法测定复杂物料中氯

Determination of Chlorine in Complex Materials by Volhard Method

含氯复杂物料用20%氢氧化钠溶液进行消解后,在酸性环境中,加过量硝酸银沉淀氯离子,后以铁铵钒作指示剂,用硫氰酸铵标准溶液滴定过剩的银离子,从而推算出复杂物料中的氯含量,试验证明该法精密度和准确度都很高,能很好地运用于生产。

The complex materials containing chlorine are digested with 20%sodium hydroxide solution.After it,in the acidic environment,excess silver nitrate precipitates chloride ions,and then vanadium iron ammonium is used as an indicator,and excess silver ions are titrated with ammonium thiocyanate standard solution.To calculate the chlorine content in complex materials,experiments show that the precision and accuracy of this method are very high and can be used well in production.