Ultrasensitive Detection of Pb²⁺ Based on a DNAzyme and Digital PCR

Figure 4

Specificity of the detection system for Pb²⁺ ions over other ions. (Pb²⁺ at 10 nM, Zn²⁺, Hg²⁺, and Cu²⁺ at 10 μM, Fe²⁺ and Ca²⁺ at 1 mM, and K⁺ at 10 mM).