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, and Ni 2+ ) do not interfere under the same conditions, due to the absence of oxidative activity of these ions, which guarantees the high selectivity of the proposed optical sensor towards Hg 2+ . The limits of detection and quantification were found to be 0.9 g L −1 and 2.7 g L −1 , respectively, and relative standard deviations varied in the range 9-12% for Hg content from 0.9 to 12.5 g L −1 and 5-9% for Hg levels from 25 to 500 g L −1 . The method was validated by analysis of CRM Estuarine Water BCR505. A possible mechanism of interaction between AgNPs and Hg 2+ for both concentration ranges was proposed on the basis of UV-Vis, TEM, and SAED analyses.

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