Abstract − Analytical Sciences, 16(4), 397 (2000).
The Use of Triton X-100 in Thermal Lensing of AqueousSolutions
Mikhail A. PROSKURNIN, Ž€Û·era B. IVLEVA, Nataliya Yu. RAGOZINA, and Elena K. IVANOVA
Analytical Chemistry Division, Chemistry Department, M. V. Lomonosov Moscow State University,Vorob'evy Hills, Moscow, GSP-3 V-234, 119899, Russia
The ability of Triton X-100 to affect thermooptical parameters of water is used for determining the surfactant by thermal lensing. The limit of detection of Triton X-100 in the presence of pre-synthesized cobalt(III) tris-(2-nitroso-1-naphtholate) as an inert colorant is 8x10-4 mol dm-3, which is close to the critical micelle concentration of the surfactant. A method for estimating the limits of detection of thermal lensing in a given solvent system based on the reproducibility of measurements for a single sample is developed. In this approach, Triton X-100 is applied for enhancing the sensitivityof thermal lensing in aqueous solutions. For the concentrations of Triton X-100 of 0.04 - 0.1 mol dm-3, a twofold enhancement in detection limits of iron(II) with 1,10-phenanthroline and cobalt(III) with 2-nitroso-1-naphthol as model systems without any change in the sample preparation is observed.
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