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. 2016 Jul 22;6(3):38. doi: 10.3390/bios6030038
Bi/PO4/PSS(A) Equal volumes of solutions of Na2HPO4 (4 mM), Bi(NO3)3 (1 mM), and Nafion are mixed. Then, 5 μL of this solution is drop-casted onto the working electrode.