Abstract
A mathematical model is presented to establish a relationship between the quantity of trace analyte vapor lost to the surface of delivery tubing and the tubing diameter, while in transit between stages of an instrument. Cold-vapor atomic absorption spectrometry for mercury, hydride generation techniques, and interfaces like the interface between electrothermal vaporization and inductively coupled plasma mass spectrometry all risk significant analyte loss before measurement. The results of this modelling substantiate the results of limited experimental work published elsewhere suggesting the use of the smallest possible tubing diameter for the delivery of atomic vapor through a tube. This diameter is calculable using Poiseuille's formula. Using this model, kinetic theory, and experimental data, the sticking probability for mercury on latex tubing is calculated to be approximately 1.6 × 10−6.
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