The method of standard additions has been applied to the determination of moisture in flowing gases using a derivative diode laser spectrometer to monitor infrared absorption. The suitability of derivative spectroscopy for standard addition analysis is discussed in terms of stability of the blank and linearity of response. It is shown that by using the method of standard additions in spectroscopic determinations, line-broadening effects due to the components of the bulk gas are automatically compensated and do not influence analytical accuracy. Simple experimental procedures are outlined for making additions and the use of standards several orders of magnitude more concentrated than the unknown is validated experimentally.
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