离子选择性电极法测定食品中钙的含量  

Determination of the calcium content of the food with ion-selective electrode

作　　者：李慧荔[1] 刘焕云[1] 苑艳辉[1] 宋炜[1] 

机构地区：[1]河北经贸大学生物工程系,石家庄050061

出　　处：《食品与药品》2005年第04A期57-59,共3页Food and Drug

摘　　要：对4 0 2型钙离子选择性电极的性能进行了测试,此电极对钙离子浓度在1 0 -4～1 0 -4mol/L范围内有较理想的能斯特响应,斜率为- 2 9.2 5mV/pCa(2 0℃) ,重现性与选择性较好,应用此电极测定食品中钙的含量,精密度和准确度较理想,结果与EDTA滴定法基本吻合。The quality of the 402 calcium selective electrode was studied.The electrode exhibited Nernstian response to Ca 2+with a slope of -29.25 mV/pCa.(20℃) over the concentration range 1.0×10 -4～1.0×10 -1mol/L.The electrode showed high selectivity and reproducibility.It has been used in the determination of calcium ion in kinds of foods.The results were similar to those obtained by EDTA titration method and the accuracy and the precision are satisfactory.

关 键 词：离子选择性电极 食品 钙 含量测定 

分 类 号：TS201.26[轻工技术与工程—食品科学]