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The article analyzes the patterns of the dispersed-phase distribution of organic ecotoxicants, namely organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), and polycyclic aromatic hydrocarbons (PAHs), in natural water systems. The relationship between the dispersed-phase distribution of individual OCPs, PCBs, and PAHs and the logarithm of the octanol-water partition coefficient log Ko/w (hydrophobicity coefficient) was established. It was shown that the water-soluble part of individual organic ecotoxicants decreases with an increase in their hydrophobicity coefficient.

The vegetable oil based emulsifiers represent a remarkable potential in the petroleum industry. In the chemical enhanced oil recovery (EOR) the application of the nonionic surfactants have a growing importance as a biodegradable type additive. The aim of our work is to prepare a simple and rapid instrumental measurement that could be used in the industrial practice and would be suitable to control the water solubility of the surfactants produced for EOR technologies by using of the available AvaSpec fiber optic spectrophotometer.