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空气-乙炔火焰原子吸收法测铬时的干扰及消除
引用本文:王妃,汤德能,王德淑.空气-乙炔火焰原子吸收法测铬时的干扰及消除[J].环境监控与预警,2016,8(1):38-40.
作者姓名:王妃  汤德能  王德淑
作者单位:铜陵市环境监测中心站,安徽 铜陵,244000
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。

关 键 词:空气  -乙炔火焰  原子吸收    干扰  消除
收稿时间:2015/8/15 0:00:00
修稿时间:9/8/2015 12:00:00 AM

Elimination of Interferences from the Determination of Chromium with Air-Acetylene Flame Atomic Absorption Spectrometry
WANG Fei,TANG De neng,WANG De shu.Elimination of Interferences from the Determination of Chromium with Air-Acetylene Flame Atomic Absorption Spectrometry[J].Environmental Monitoring and Forewarning,2016,8(1):38-40.
Authors:WANG Fei  TANG De neng  WANG De shu
Abstract: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 in-terference could be eliminated by the addition of a mixed solution containing 1% HNO3 and 2% NH4 Cl.When the mass concentra-tion 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 .
Keywords:Air-acetylene flame  Atomic absorption spectrometry  Chromium  Interference  Elimination
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