硫脲的示波滴定

Determination of Thiourea by Oscillographic Titration

研究了硫脲的示波滴定方法 ,利用硫脲与已知过量的AgNO3 定量生成沉淀的反应原理 ,再加入已知过量的Na TPB沉淀Ag+ ,然后以氯化四乙基铵返滴定。方法简便、快速 ,终点直观 ,不受溶液的颜色及沉淀存在的影响。方法标准加入回收率在 99.0 %～ 1 0 0 .5 %。相对标准偏差 <0 .5 %。

The method for indirect determination of thiourea by ocsillographic titration. In the pH 10.0, the thiourea was completely precipitated by excessive silver nitrate, and the excessive silver nitrate was completely precipitated by sodium tetraphenylborate, the sodium tetraphenylborate was detected by ocsillographic titration for calculating the content of thiourea. The method was applied to determination of thiourea with precision of RSD 0.5%.