火焰原子吸收光谱法测定铝合金中铬

FAAS Determination of Chromium in Aluminum Alloy

铝合金样品溶于盐酸及过氧化氢中,其铬量用火焰原子吸收光谱法测定。采用空气-乙炔富燃火焰原子化并用锶盐作干扰抑制剂。铬的工作曲线浓度范围为1.2～20.0 mg.L-1(r=0.999)。方法应用于4个铝合金标样的测定,所得结果与标准值相符。方法的RSD(n=5)值在2.1%～4.2%之间,回收率在97%～104%之间。

Sample was dissolved in hydrochloric acid and hydrogen peroxide, and its chromium content was determined by FAAS. Reductive flame of air-acetylene gas mixture was used in the atomization, and strontium salt was used as inhibitor. Conditions for chemical treatment of sample and operation of the instrument were studied and optimized. Working curve in range of 1.2 mg to 20.0 rng of chromium（ Ⅲ ） per L of test solution was prepared, having the correlation coefficient of 0. 999. In its application to the analysis of 4 standard samples, results obtained were in consistency with the standard values. Values of RSDrs （n=5） and of recovery were found in the ranges of 2. 1%-4. 2% and 97%-104% respectively.