甲酰胺萃取-卡尔·费休容量法测定硫酸铜中总水含量  

Determination of total water content in copper sulfate by formamide extraction-volumetric Karl Fischer method

作　　者：马跃龙[1,2] 邓陶陶 MA Yuelong;DENG Taotao(Shanghai Institute of Quality Inspection and Technical Research,Shanghai 200233;National FoodQuality Supervision and Inspection Center(Shanghai),Shanghai 200233;China National Center forFood Safety Risk Assessment,Beijing 100022)

机构地区：[1]上海市质量监督检验技术研究院,上海200233 [2]国家食品质量监督检验中心(上海),上海200233 [3]国家食品安全风险评估中心,北京100022

出　　处：《中国食品添加剂》2024年第6期179-184,共6页China Food Additives

基　　金：食品安全国家标准项目(食品添加剂硫酸铜,项目编号:spaq-2020-03)。

摘　　要：建立卡尔·费休联合甲酰胺萃取法测定硫酸铜中的总水含量。采用甲酰胺与甲醇混合作为萃取剂提取硫酸铜中的游离水及结合水,卡尔·费休容量法测定硫酸铜中水分含量。结果表明甲酰胺与甲醇体积比为4∶6作为提取溶液,萃取时间为1 min时,卡尔·费休容量法可以全部检出硫酸铜中的水分,因此采用卡尔·费休联合甲酰胺萃取法测定硫酸铜的水分含量,可以完全检出硫酸铜中的游离水和结晶水,且精密度良好,经验证可以作为硫酸铜中总水含量的可靠检测方法。To establish a formamide extraction-volumetric Karl Fischer method for the determination of total water content in copper sulfate,mixture of formamide and methanol was used as the extraction agent to extract free and bound water in copper sulfate,and the volumetric Karl Fischer method was used to determine the water content in copper sulfate.The result showed that using a 4∶6 volume ratio of formamide to methanol as the extraction solution,and an extraction time of 1 minute,the volumetric Karl Fischer method could detect all the water in copper sulfate.Therefore,the formamide extraction-volumetric Karl Fischer method was used to determine the water content of copper sulfate,and both the free water and crystalline water in copper sulfate could be completely detected with good relative standard deviation.It can be used as a reliable detection method for the total water content in copper sulfate.

关 键 词：硫酸铜 卡尔·费休 结晶水 

分 类 号：TS207.3[轻工技术与工程—食品科学]