石墨炉原子吸收法测定空心胶囊中的铬含量

目的:建立测定空心胶囊中铬含量的方法。方法:采用石墨炉原子吸收法。以铬国家标准溶液为基准,用高温炉升温至800℃消解样品;测定条件为铬空心阴极灯,波长357.9nm,狭缝0.7nm,灯电流10mA,石墨炉原子化器,保护气为氩气,氘灯背景校正系统。结果:铬检测浓度线性范围为2～60μg.L-1(r=0.9992),检测限为0.5μg.L-1,平均回收率为100.19%,RSD=1.26%。结论:该方法准确可靠,可用于空心胶囊中铬含量的测定。

Content Determination of Chromium in Vacant Capsules by Graphite Furnace Atomic Absorption Spectrometry

OBJECTIVE： To establish the method for the content determination of chromium in vacant capsules. METHODS： Graphite furnace atomic absorption spectrometry （GFAAS） method was adopted. Based on national standard solution, the tempera- ture of sample increased to 800 ℃ by high temperature furnace and digested. The determination condition was as follows： chromi- um hollow cathode lamp, detection wavelength of 357.9 nm, slit of 0.7 nm, lamp electric current of 10 mA, graphite furnace atom- izer, shielding gas of argon gas, deuterium lamp background correction system. RESULTS： The linear range of chromium was 2 60 g.L-1（r=0.999 2）. The detection limit was 0.5 μg.L-1 with average recovery of 100.19% （RSD=1.26%）. CONCLUSION： GFAAS method is accurate and reliable, and it is suitable for the content determination of chromium in vacant capsules.