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
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
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空气-乙炔火焰原子吸收法测铬时的干扰及消除
王妃,汤德能,王德淑
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% HNO3和2% NH4Cl可消除干扰;当ρ(共存元素)/(Cr)>30时,加入5% HCl和超过1%的NH4Cl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%HNO3介质。
关键词:  空气-乙炔火焰  原子吸收    干扰  消除
DOI:
分类号:O657.31
基金项目:
Elimination of Interferences from the Determination of Chromium with Air-Acetylene Flame Atomic Absorption Spectrometry
WANG Fei,TANG Deneng,WANG Deshu
Tongling Environmental Monitoring Central Station,Tongling,Anhui 244000,China
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 interference could be eliminated by the addition of a mixed solution containing 1% HNO3and 2% NH4Cl. When the mass concentration ratios exceeded 30,a solution containing 5% HCl and more than 1% NH4Cl 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.
Key words:  Air acetylene flame  Atomic absorption spectrometry  Chromium  Interference  Elimination