Analytical applications of ultrasound with chemiluminescence will be discussed for flow systems with luminol and at liquid interfaces with electrogenerated chemiluminescence. A novel ultrasonic flow injection chemiluminescence (FI-CL) manifold for determining hydrogen peroxide (H₂O₂) was designed and evaluated. Chemiluminescence obtained from the luminol-H₂O₂-cobalt (II) reaction was enhanced by applying 120 W of ultrasound for a period of 4 s to the reaction coil in the FI-CL system and this enhancement was verified by comparison with an identical manifold without ultrasound. A calibration curve was obtained with a linear portion over the range of 10 - 200 nmol L^-1 H₂O₂ (correlation coefficient 0.9945). The detection limit (3σ) was found to be 1x10^-9 and the relative standard deviation was 1.37 % for 2x10^-7 mol L^-1 H₂O₂ (n=10)[1]. The method was applied to the determination of trace amounts of H₂O₂ in purified water and natural water samples without any special pre-treatments.

1. Gillian M. Greenway^a*, Tapparath Leelasattarathkul^b, Saisunee Liawruangrath^b, R.Alan Wheatley^a, Napaporn Youngvises.^c 2006 Analyst , 131, 501-508

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