Figure 4
From: Gold nanozyme-based paper chip for colorimetric detection of mercury ions
(A) Colorimetric signal amplification depending on the number of drops of test sample. A 2 μL drop of test sample containing 0.4 ng Hg was repetitively applied on each test zone of the AuNZ-PAD with a time interval of 2 min. (B) Selectivity of the AuNZ-PAD against other metal/metalloid species. The added levels of Hg2+ and other metal/metalloid species were 1 and 100 ng, respectively. Error bars represent the SD of three independent experiments.
