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一、前言铝镁合金具有高耐腐蚀性能,广泛的被用作仪器仪表零部件的材料。铝镁合金中其它杂质元素的含量较低,我们过去测定其中镁含量曾使用磷酸铵镁重量法,准确度虽高,但手续繁复,不适用于日常大量分析。如用氢氧化钠溶液溶样借以分离大量铝,而后用硼酸盐缓冲液调节酸度,沉淀分离 Fe、Mn 等;用氢氧化钠溶样分离大量铝后用氰化钾掩蔽 Fe、Cu、Mn 等杂质元素,以 EDTA 络合滴定镁的容量法,均需经过两
I. Introduction Aluminum-magnesium alloy with high corrosion resistance, is widely used as instrumentation components of the material. Aluminum and magnesium alloy content of other impurities is lower, we used to determine the magnesium content in the past, the use of magnesium ammonium phosphate gravimetric method, the accuracy is high, but the procedure complicated, not suitable for daily large-scale analysis. Such as sodium hydroxide solution to dissolve a large number of samples to separate aluminum, and then adjusted with borate buffer acidity, precipitation separation Fe, Mn, etc .; with sodium hydroxide sample separation of a large number of aluminum after masking with potassium cyanide Fe, Cu, Mn And other impurity elements, EDTA titration volumetric titration of magnesium, are required to go through two