Research Article

3-Mercaptopropyltrimethoxysilane Modified Diatomite: Preparation and Application for Voltammetric Determination of Lead (II) and Cadmium (II)

Figure 7

DP-ASV voltammograms for Cd(II) and Pb(II) using GCE modified by MPTMS-diatomite with differential amounts. (a) Bare GCE; (b) Nafion/GCE; (c) MPTMS (6.99%)-diatomite/GCE; (d) MPTMS (7.21%)-diatomite/GCE; (e) MPTMS (8.04%)-diatomite/GCE; (f) MPTMS (9.88%)-diatomite/GCE recorded in 0.1 M ABS (pH 4.5) containing 100 ppb Cd(II) and 200 pbb Pb(II); scan rate 0.10 V s−1.