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(a) Effect of HCl concentration on the Pb signal. (b) Effect of NaBH4 concentration on the Pb signal. (c) Effect of K3[Fe(CN)6] concentration on the Pb signal. (d) In the trapping step, the effect of H2 flow rate on the Pb signal. (e) Effect of releasing temperature on the Pb signal. (f) Effect of trapping time on the Pb signal.
