摘要
现有的石灰石中碳酸钙的测定方法试验用材造价较高,且操作较繁琐,本研究对其进行了改进,取消了用铂坩埚高温熔融、加氟化钾掩蔽等操作。具体方法:用浓盐酸溶解石灰石粉末,加三乙醇胺掩蔽Fe3+和Al3+,Na OH掩蔽Mg2+,排除干扰离子后钙红作指示剂,用EDTA滴定Ca2+。
The experimental material for the determination methods of calcium carbonate in existing limestone has arelatively high cost, and the operation is relatively cumbersome, this study made an improvement and canceled theplatinum crucible melting, potassium fluoride masking and other operations, The specific method is as follows： Usingconcentrated hydrochloric acid to dissolve limestone powder, adding triethyl amine to mask Fe3 ＋and Al3 ＋, Na OH tomask Mg2＋, after eliminating the interference ion, with calcium red as the indicator for titration of Ca2＋with EDTA.
出处
《河南科技》
2015年第9期119-122,共4页
Henan Science and Technology
关键词
络合滴定
EDTA
碳酸钙
掩蔽剂
complex titration
EDTA
calcium carbonate
masking agent
