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8 nM. The assay for I- can also be convenient to implement for visual monitoring of I- by observing color change of test paper printed with the ratiometric probe, responding to 50 nM that is about 1 order of magnitude lower than the median urinary I- concentration defined by the World Health Organization (WHO) for school-age children. The sensitive test paper can provide an advanced platform for colorimetric and visual monitoring of I- in human urine.Copper nanoparticles (CuNPs) were prepared through a wet chemistry method to be used as