摘要
乙醇导入ICP导致等离子体连续辐射(即复合辐射和轫致辐射)强度减小和分子带(主要是CN带)强度增大。分子带的影响随波长而异,所以在正常分析区不同波长处的总背景强度随乙醇浓度增大有三种变化趋势:单调增大、单调减小或在某个乙醇浓度时出现最小值。详细研究了CN带强度与ICP工作参数的关系以及CN带对稀土元素和钪灵敏线的干扰,指出适当增加炬管的外管长度可以有效地抑制CN带。
The introduction of ethanol into an Ar ICP results in decrease of the intensity of the plasma continuous emission but increase of the intensity of molecular bands (mainly CN band). With increasing ethanol concentration, the total background intensity at different wavelength increases or decreases or reaches a minimum depending on, the different interference of molecular bands. From the influence of ethanol on the intensity of the plasma continuous emission, it was concluded that the electron number density in the plasma decreases with a larger degree in the centre channel than in the other regions owing to the introduction of ethanol. The interference of CN band on the prominent lines of rare earth elements and Sc and the effect of ICP operating conditions on CN intensity have been investigated. Adequately lengthening the outer tube of a plasma torch was suggested to be an effective approach for the elimination of CN band.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1990年第1期25-29,共5页
Chinese Journal of Analytical Chemistry
关键词
ICP-AES
有机溶剂
背景
氰辐射
Inductively coupled plasma
Atomic emission spectrometry
Organic solvent
