摘要
以钡离子与硫酸根离子沉淀反应的热效应为基础,通过测定孤立体系中的温度变 化,建立了测定萃取磷酸中三氧化硫的注入热焓法。该法在 4.0~32.0 g/L范围内可准确测 定SO3的含量,相对标准偏差为1.8%;标准加入回收率为98%~103%。
An injection enthalpimetric method for the determination of SO3, has been devel- oped based on measuring the change of temperature in the isolated system during the exothermic reaction of Ba2+ and SO2-4. The concentration of SO3 may be determined in the range of 4. 0~32. 0 g/L with RSD of 1. 8% and recovery of 98%~103%.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1998年第4期407-409,共3页
Chinese Journal of Analytical Chemistry