Coumarinyl-rhodamine, HCR, served as an extremely selective sensor for Pd²⁺ ions in ethanol/H₂O (8 : 2, v/v, HEPES buffer, pH 7.2) solution and the limit of detection (LOD) was 18.8 nM (3σ method).
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Adak et al. (2019) studied this question.
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