本文进一步研究了锰矿中钙镁的络合测定,通过试验讨论了关于“铜试剂-钽试剂-四氯化碳”排除干扰的问题,以及利用钙电极探讨直接测定镁时应用EGTA 作为钙的掩蔽剂的问题。一试剂与仪器PHS-2型酸度计282型甘汞电极钙电极:泰县无线电厂铜试剂:30%水溶液,现配现用钽试剂:5%乙醇溶液。K-B 毒旨示剂:称取0.1克酸性铬兰K,0.15克奈酚绿 B,20克硫酸钾,充分研成粉末。CMC:1%,称1克羧基甲基纤维索纳,溶于100ml热水中。 In this paper, the complexation determination of calcium and magnesium in manganese ore is further studied. The problems of eliminating the interference with “copper reagent - tantalum reagent - carbon tetrachloride ” are discussed through experiments and the use of calcium electrode to explore the direct application of EGTA as calcium Masking agent problem. A reagent and instrument PHS-2-type acidity meter calomel 282 electrode Calcium electrode: Taixian Radio Factory Copper reagent: 30% aqueous solution, now with active tantalum reagent: 5% ethanol solution. K-B poison indications: Weigh 0.1 grams of acid Chromium K, 0.15 grams of Naeba Green B, 20 grams of potassium sulfate, fully ground into powder. CMC: 1%, said 1 gram carboxyl methyl fiber Sonar, dissolved in 100ml hot water.