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Abstract
In this review, the different strategies developed for the analysis of pesticides, heavy metals, and other contaminants in the agroalimentary and environmental fields using chemical flow-through optical sensors is described. A brief description of the different flow methodologies used in optosensing is provided, and detailed descriptions of selected examples are explained, paying special attention to the strategies adopted by the different authors to improve sensitivity and selectivity, as well as the sample treatments used for the different reported applications. The future trends of these systems are also discussed.