Real-Time Atom Residence Time Compensation in Chemical Vapor Generation Atomic Spectrometry. A More Precise Analytical Signal
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- 作者：Alex J. Blois ; Ryan G. Keddy ; R. Scott Daniels ; and Richard Dams
- 刊名：Analytical Chemistry
- 出版年：1998
- 出版时间：March 15, 1998
- 年：1998
- 卷：70
- 期：6
- 页码：1223 - 1227
- 全文大小：114K
- 年卷期：v.70,no.6(March 15, 1998)
- ISSN：1520-6882
文摘
Batch chemical vapor generation techniques, using flow-through optical cells for the spectrochemical determination of mercury, produce transient signals whose peakarea generally varies inversely as a function of thecarriergas flow rate. One significant source of within- andbetween-day signal variability is the vacillation of thecarrier gas flow rate. Methods are presented tocompensate for this variability by separately performing signalcompensation in postacquisition and real-time modes.These methods involve processing the transient absorbance or fluorescence and the carrier gas flow rate datato produce new analytical signals. Results arepresenteddemonstrating improved signal precision (reproducibility), from 31 to 4.4% (CV, n = 10), for thecold-vaporatomic absorption and atomic fluorescence determinationof mercury.