改良高锰酸钾法测定二氧化硫脲

Determination of thiourea S dioxide with improved potassium permanganate

用草酸钠改良高锰酸钾法测定了二氧化硫脲．该方法可以排除三氧化硫脲的干扰，相对标准偏差为２．５％～４．３％，加标回收率为９８％～１０３％．与工业上采用的碘量法相比，测定速度快，成本低．

The potassium permanganate improved by Na 2C 2O 4 has been used for determina tion of thiourea S dioxide.This method can eliminate the interference of thiourea S trioxide.The RSD is 2 5%～4 3%,and the recovery is 98%～103%.This method is lower cost and rapider than iodimetry.