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本方法对钙、镁含量低的硅酸盐提出的。以三乙醇胺为掩蔽剂,在强碱性溶液中加入碳酸钠,使钙、镁成碳酸钙和氢氧化镁沉淀,从而与铁、铝、锰(微量)及硅酸等分离,然后用EDTA滴定钙、镁。此法可以按硅酸盐分析的正常程序,在分离硅酸之后以滤液测定钙、镁;也可以在用碳酸钾钠熔融试样后,在盐酸浸出液中直接运用本方法测定钙、镁。分析方法一、试剂: 标准钙溶液:1毫升(?)1毫克CaO。称取1.7848克CaCO_5,加30毫升水,缓缓加入20毫升1:1盐酸,待完全溶解后煮沸驱去二氧化碳,冷后于量瓶中稀成1升。
This method is proposed for silicates with low calcium and magnesium content. With triethanolamine as a masking agent, sodium carbonate is added to a strong alkaline solution to precipitate calcium and magnesium into calcium carbonate and magnesium hydroxide, and then separated from iron, aluminum, manganese (trace) and silicic acid, and then titrated with EDTA Calcium, magnesium. This method can be silicate analysis of the normal procedure, after the separation of silicic acid filtrate determination of calcium and magnesium; also sodium carbonate can be melted after the sample, hydrochloric acid leaching solution directly using the method of determination of calcium and magnesium. Analytical methods A reagent: standard calcium solution: 1 ml (?) 1 mg CaO. Weigh 1.7848 grams of CaCO_5, add 30 ml of water, slowly add 20 ml of 1: 1 hydrochloric acid, boil until completely dissolved to drive carbon dioxide, diluted in the flask after dilute into 1 liter.