“…Mass transport by diffusion is a fundamental process that plays an important part in chemistry and chemical engineering in processes such as liquid extractions, solid extraction, distillation, and chemical reactions as well as biological systems. Different experimental methods are established to measure diffusion coefficients: diaphragm cell, − conductometric , and optical − (e.g., Gouy-, Rayleigh-, and holographic interferometry), and dynamic light scattering (DLS). − A fast and simple method compared with optical techniques, the Taylor dispersion technique is well established in the case of binary mixtures of organic compounds and of electrolyte solutions. − With this method, it is also possible to investigate diffusion processes in ternary systems. − However, the fact that in organic liquid systems one experimentally measurable quantity, the refractive index, has to be used to extract two eigenvalues or four elements of the matrix of ternary mutual diffusion coefficients demonstrates the considerably higher complexity of the ternary diffusion problem, and as a consequence, publications of ternary diffusion coefficients are rather rare.…”