Previous article . ... In the presence of inert colourants (for increasing the sensitivity of thermal-lens measurements), the limits of detection of ethanol and DMSO are 0.3% (6 10 –2 mol/L) and 0.04% (3 10 –3 mol/L), respectively. The limits of detection of nonionic surfactants Tween-80, Triton X-100 Х Brij-35 are n 10 –3 mol/L. Moscow University Chemistry Bulletin . 2003, Vol. ... Copyright (C) Chemistry Dept., ... Copyright (C) Chemisty Department of Moscow State University . ...