实践教学创新——钙检测法的改进  

Practice Education Reform——The Improvement of Calcium Detection

作　　者：蒋英[1] 史玉茹 陈忠平[1] 朱金坤[1] 

机构地区：[1]安徽科技学院,安徽滁州233100

出　　处：《广州化工》2017年第5期158-159,176,共3页GuangZhou Chemical Industry

基　　金：大学生创新项目(NO:16XCX43);安徽科技学院教研项目(NO:X2014073);精品资源共享课(NO:Xj201407)

摘　　要：对于复杂矿石样品中Ca^(2+)的含量,常规方法难以实现安全、简便的测量。有鉴于此,我们以HF/HCl混合消解矿石样品,采用饱和Na_2CO_3将消解产生的难溶CaF_2转化为CaCO_3;随后,以稀盐酸溶解CaCO_3释放出Ca^(2+),以EDTA滴定其准确含量。该方法安全、便捷,具有良好的重现性、可靠性:相对标准偏差0.052%,加标回收率98.9%~99.8%。这一研究过程有助于提升学生的化学实践创新能力。It’s difficult to detect Ca2＋in complicated mineral samples with a simple and safe chemical method. The mineral samples in the mixture solution of HF-HCl were digested,and the formed precipitate of CaF2 to CaCO3 with saturated solution of Na2CO3 was translated. These CaCO3 could be dissolved easily in hydrochloric solution to release Ca2＋,following an accurate titration with EDTA. The safety and convenience of this improved Ca2＋detection method was encouraging with a relative standard deviation of 0. 052% and a recovery of 98. 9% 99. 8%. This investigation was beneficial to develop the students’ innovation ability in chemistry.

关 键 词：矿石 钙离子 配位滴定 氟化钙 

分 类 号：O652.1[理学—分析化学]