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(a) A μPED for quantifying heavy metal ions. Reprinted with permission.65 Copyright 2010 Royal Society of Chemistry. (b) The lateral flow paper‐based device for heavy metal detection. Reprinted with permission.13 Copyright 2015 Springer. (c) Scheme of the μCS. Reprinted with permission.14 Creative Commons license 4.0 (CC BY‐NC‐ND 4.0).
