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沉积的碳酸盐岩石主要是由方解石(CaCO_3)和白云石(CaMg[CO_3]_2)的碳酸盐矿物组成。对于碳酸盐岩石中二氧化碳、氧化钙、氧化镁的测定,在例行的分析中,都是单独取样,分别以吸收重量法或容量法测定二氧化碳,以草酸铵-高锰酸钾容量法测定钙,而镁则根据 CO_2与 CaO 的含量之差数来求得,或用氢氧化钡标准溶液使镁沉淀,于滤液中用盐酸滴定过量的氢氧化钡而测定镁。为了缩短分析时间,简化操作手续,节省试剂,作者提出了在以酸碱容量法测定 CO_2后,在同一份样品中,以 E.D.T.A.络合滴定法进行钙和镁的连续测定方案。通过二年来的实践证明是完全可行的。它的特点是比较经济准确简便快速,因此具有一定的实际意义。
Sedimentary carbonate rocks are mainly composed of carbonate minerals of calcite (CaCO 3) and dolomite (CaMg [CO 3] 2). For carbonate rock carbon dioxide, calcium oxide, magnesium oxide determination, in a routine analysis, are taken separately, respectively, by absorption gravimetric or volumetric method for the determination of carbon dioxide, ammonium oxalate - potassium permanganate volumetric method for the determination Calcium, and magnesium is based on the difference between the content of CO_2 and CaO to obtain, or with barium hydroxide standard solution of magnesium precipitation, in the filtrate with hydrochloric acid titration excess barium hydroxide and magnesium. In order to shorten the analysis time, simplify the operation procedure and save the reagents, the authors proposed the continuous determination of calcium and magnesium by the E.D.T.A. complexometric titration method in the same sample after the determination of CO_2 by the acid-base volumetric method. After two years of practice proved to be entirely feasible. It is characterized by relatively simple and quick economy, so it has some practical significance.