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原子吸收法测定硅,文献中已有报导。本文对铝合金中硅的测定进行了研究,选定了最佳工作条件。方法具有两个特点,其一,用酸溶样,速度快;其二,用钼酸铵溶液作抑制剂,既能抑制铝及其它阳离子的干扰,同时提高了测定的灵敏度,还能防止硅的凝聚作用,使测定结果稳定,重现性好。试验部分一仪器及主要试剂 GGX-2型原子吸收分光光度计。仪器条件:灯电流5毫安,氧化亚氮气流量10升·分~(-1),乙炔流量4.6升·分~(-1),波长2516埃,光谱通带2埃。盐酸、硝酸为提纯酸,氢氟酸、硼酸一级,金属铝99.99%,钼酸铵高纯,三次去离子水,其余金属均为光谱纯。标准溶液的制备:称取2.1393克二氧化硅于铂坩
Atomic absorption spectrometry for the determination of silicon has been reported in the literature. In this paper, the determination of silicon in aluminum alloy has been studied, the best working conditions were selected. The method has two characteristics. One is to dissolve the sample quickly with acid, and the other is to use ammonium molybdate solution as an inhibitor to inhibit the interference of aluminum and other cations while improving the sensitivity of measurement and preventing silicon The coagulation effect, the determination of the results of a stable, reproducible. Experimental part of an instrument and the main reagent GGX-2 atomic absorption spectrophotometer. Instrument Conditions: Lamp current 5 mA, N 2 O flow 10 l • min -1, acetylene flow 4.6 l • min -1, wavelength 2516 Å, spectral pass band 2 Å. Hydrochloric acid, nitric acid as purified acid, hydrofluoric acid, boric acid, aluminum 99.99%, ammonium molybdate high purity, three times deionized water, the remaining metals are purely spectral. Preparation of standard solution: Weigh 2.1393 g of silica in a platinum crucible