Abstract
Mesoporous SBA-16 was synthesized using tetraethoxysilane as silicon source and a ternary system consisting of surfactant F127, water and butanol. Owing to the excellent properties of SBA-16 such as lager surface area and strong accumulation ability, the stripping peak current of Cd2+ and Pb2+ remarkably increases at the SBA-16 modified carbon paste electrode. Moreover, the peak current of Cd2+ and Pb2+ further enhances after the addition of I−. Under the joint enhancement effects of SBA-16 and I−, the detection sensitivity of Cd2+ and Pb2+ is greatly improved. The influences of concentration of I−, amount of SBA-16, accumulation potential and time were investigated. As a result, a new electrochemical method with high sensitivity was developed for the simultaneous determination of Cd2+ and Pb2+. The limit of detection is 0.6 nM for Cd2+ and 1 nM for Pb2+. It was used to determine Cd2+ and Pb2+ in waste water sample, and the results consisted with the values that obtained by atomic absorption spectrometry.
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