Determination of lead and cadmium in soil by differential pulsevoltammetry using ionic liquid/graphene/manganese dioxidecomposite modified glassy carbon electrode
LIU Lin-hai,WANG Juan,JIN Xin,ZHANG Ting,CHEN Zong-bao*
Key Laboratory of Applied Organic Chemistry College of Jiangxi Province, School of Chemistry andEnvironmental Sciences, Shangrao Normal University, Shangrao 334001, China
Abstract：The graphene (GR)-manganese dioxide (MnO2) dispersion liquid were dripped on glassy carbon electrode (GCE) by dispensing method. Then the ionic liquid (OMIMPF6) was polymerized by cyclic voltammetry to prepare OMIMPF6/GR/MnO2/GCE composite modified GCE. The determination method of lead and cadmium in soil by differential pulse voltammetry was established. The modified electrode was prepared by dispensing 4μL of 2mg/mL GR-MnO2 dispersion liquid followed by electric polymerization of ionic liquid for 30 cycles. The experiments showed that the oxidation peak current of Pb2+ and Cd2+ was relatively high in 0.1mol/L acetic acid-sodium acetate buffer solution (pH 4.5) supporting electrolyte. The linearity was good for Pb2+ and Cd2+ with concentration in range of 5.0×10-8 and 1.4×10-5 mol/L. The detection limit was 5.0×10-10 mol/L and 4.0×10-9 mol/L for Pb2+ and Cd2+, respectively. The standard mixed solution containing 10μmol/L Pb2+ and 10μmol/L Cd2+ was determined parallelly for 9 times and scanned continuously for 30 times. The relative standard deviation (RSD) of peak current was 1.3% and 4.3% for Pb2+ and Cd2+, respectively. It indicated that the modified electrode had good reproducibility and stability. The proposed method was applied for the detection of lead and cadmium in soil, and the found results were basically consistent with those obtained by atomic absorption spectrometry (GB/T 17141—1997). The RSD (n=6) were less than 5.3%, and the recoveries were between 97% and 105%.
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LIU Lin-hai,WANG Juan,JIN Xin,ZHANG Ting,CHEN Zong-bao. Determination of lead and cadmium in soil by differential pulsevoltammetry using ionic liquid/graphene/manganese dioxidecomposite modified glassy carbon electrode. , 2018, 38(2): 32-37.
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