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铝合金中镁的测定,一般采用碱熔分解试样,使铝形成可溶性偏铝酸钠与镁分离,再于弱酸性溶液中,用铜试剂沉淀分离其它干扰元素后用EDTA滴定。但此法须经两次分离过滤手续。我们针对本单位所用铝合金用碱不易分解这一情况,拟定了相应的分析方法。选用盐酸和少量过氧化氢分解试样,在酸性介质中以硫代硫酸钠使铜形成硫化物沉淀,不过滤直接加入氢
Determination of magnesium in aluminum alloy, the general use of alkali melt decomposition of the sample, the formation of aluminum soluble sodium aluminate and magnesium separation, and then weak acid solution, with copper reagent precipitation after the separation of other interfering elements with EDTA titration. However, this method is subject to separation and filtration procedures twice. We are aimed at the aluminum alloy used in this unit is not easy to decompose this situation, the development of the corresponding analysis. Hydrochloric acid and a small amount of selected hydrogen peroxide decomposition of the sample, in an acidic medium with sodium thiosulfate to form copper sulfide precipitation, but not direct filtration of hydrogen