"Thermal-lens Absorption Measurements On Small-volume Samples"
Anal. Chem.
1984 Volume 56, Issue 6 Pages 922-925
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C. A. Carter and J. M. Harris
Abstract:
Good sensitivity and the use of focused laser excitation make thermal-lens calorimetry particularly suitable for detection in small-volume samples, as required in HPLC and flow injection analysis. The fundamental balance between detection volume and sensitivity is shown to be related to the divergence of the focused beam. An expression is derived for minimum sample volume for a given pathlength. Consideration is given to the sources of noise that depend directly on how tightly the laser is focused through the sample. A 300-mW argon-ion laser at 514.5 nm is applied to test solution of iodine in CCl4 in cells of pathlength 1 mm (volume <0.5 µL) and 1 cm. Sample concentration. ranged from 2.5 nM to 2.5 µM for the larger volume and from 25 nM to 25 µM for the smaller volume Limits of detection of 3.7 pg and 0.18 pg for the larger and smaller volume, respectively, are reported.
Iodine
Laser
