The determination of preservatives in cosmetic and pharmaceutical industry products is important, not only when considering the quality control of these preparations, but also because of the numerous reports of allergic reactionsthat they can cause. Therefore, the relevant regulations limiting the contents of the individual ingredients incosmetics and pharmaceuticals are introduced to increase the safety of their application. On the other hand, increaseduse of preservatives is a potential threat to the environment. Nowadays, wastewater treatment plants are not equippedwith the tools to effectively eliminate residues of such compounds, usually organic, that after the cleaning process canget into natural water and affect aquatic ecosystems. Due to their properties, (bactericidal, stability, lack of biodegradability), these compounds become a real threat to the environment. Therefore, it is necessary to develop analytical methods and procedures to allow for the determination of preservatives, not only in the samples of drugs and cosmetics, but also their residues in surface waters. These methods should allow for quantitative extraction, concentration(especially in the water samples in which the analytes will be present at low concentrations), separation, and the simultaneous determination of all chosen preservatives in different cosmetic products, or in water. The methods should also eliminate interference from the matrix (cosmetics, pharmaceuticals, environmental waters).
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