Fig. 9. The impact of NH₄Cl and H₂O₂ on intracellular pH measured using the PFSqG2-5% Pdots. The intracellular pH of the cells treated with NH₄Cl and H₂O₂ in pH 7.4 PBS buffer solution (A), and the calculated ratio of I _{700 nm}/I _{438 nm} of the PFSqG2-5% Pdots for the control and treated cells (B).