空气-乙炔火焰原子吸收法测铬时的干扰及消除  

Elimination of Interferences from the Determination of Chromium with Air- Acetylene Flame Atomic Absorption Spectrometry

作　　者：王妃 汤德能 王德淑 

机构地区：[1]铜陵市环境监测中心站,安徽铜陵244000

出　　处：《环境监控与预警》2016年第1期38-40,共3页Environmental Monitoring and Forewarning

摘　　要：对空气-乙炔火焰原子吸收法测铬(Cr)时共存元素对其测定结果的干扰进行研究。结果表明,当ρ(共存元素)/ρ(Cr)<100时,Mg、Co、Al、V、Ni、Fe、Na、Ca对Cr测定有影响,而K、Mn、Zn、Mo、Pb、Si、Cu均不影响Cr的测定;当ρ(共存元素)/ρ(Cr)为10和30时,加入1%HNO_3和2%NH_4Cl可消除干扰;当ρ(共存元素)/ρ(Cr)>30时,加入5%HCl和超过1%的NH_4Cl可消除干扰;5%HCl作为介质消除Cr测定干扰的效果要优于1%HNO_3介质。Interference of concomitant elements from the determination of chromium with air - acetylene flame atomic absorption spectrometry was investigated. The results showed that the measurement of chromium （Cr） was affected when the mass concentration ratio of Mg, Co, Al, V, Ni, Fe, Na, or Ca with respective to Cr was below 100. There was no interference when K, Mn, Zn, Mo, Pb, Si, and Cu were present. When the mass concentration ratios of concomitant elements with respect to Cr were between 10 and 30, the interference could be eliminated by the addition of a mixed solution containing 1% HNO3 and 2% NH4Cl. When the mass concentration ratios exceeded 30,a solution containing 5% HCl and more than 1% NH4 Cl could eliminate the interference. The use of 5% HCl served as a better media than 1% HNO3 in eliminating the inferences from the measurement of the Cr.

关 键 词：空气-乙炔火焰 原子吸收 铬 干扰 消除 

分 类 号：O657.31[理学—分析化学]