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Vanadium and molybdenum concentrations in particulate from Palermo (Italy): analytical methods using voltammetry

Diana AMORELLO,Santino ORECCHIO

《环境科学与工程前沿（英文）》 2015年第9卷第4期页码 605-614 doi: 10.1007/s11783-014-0703-8

摘要： The main purpose of this work was to develop a reliable method for the determination of vanadium (V) and molybdenum (Mo) in atmosphere particles or aerosols because they can not be readily measured using conventional techniques. For this research, 30 particulate samples were collected from five different stations located at Palermo, Italy. We used the catalytic adsorptive stripping voltammetry and differential pulsed voltammetry to measure V and Mo in atmospheric particulate, respectively. The represented method includes advantages of high sensitivity, high selectivity, simplicity, reproducibility, speed and low costs. The quantification limits for V and Mo are, respectively, 0.57 and 0.80 ng·m . The precision, expressed as relative standard deviation (RSD %), was about 2% for both metals. The mean recoveries of added V and Mo were about 99.5% and ranged from 97% to 101%. Vanadium concentrations in particulate samples collected in Palermo area ranged from 0.57 to 7.7 ng·m , while Mo concentrations were in the range 0.8–51 ng·m . In many cases the concentrations of two elements in the particulate samples fall below the detection limits. The mean concentrations for V and Mo in particulate samples, collected in Palermo area, were respectively 3.1 and 5.9 ng·m .

关键词： vanadium molybdenum particulate voltammetry Palermo

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Electrochemical reduction characteristics and the mechanism of chlorinated hydrocarbons at the copper electrode

XU Wenying, GAO Tingyao, ZHOU Rongfeng, MA Lumin

《环境科学与工程前沿（英文）》 2007年第1卷第2期页码 207-212 doi: 10.1007/s11783-007-0036-y

摘要： The electrochemical reduction characteristics of chlorinated hydrocarbons were investigated by cyclic voltammetry technique. The reduction mechanism and activity of the chlorinated hydrocarbons at the copper electrode were explored. The relationship between the structure of chlorinated hydrocarbons and their reductive activity were discussed. The experimental results showed that chlorinated alkanes and a portion of chlorinated aromatic hydrocarbons could be reduced directly at the copper electrode. However, chlorinated aromatic hydrocarbons were not easy to reduce at the copper electrode. The results provided a theoretical basis for the catalyzed iron inner electrolysis method.

关键词： electrolysis chlorinated relationship mechanism voltammetry technique

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基于纳米金/介孔NiO/泡沫镍纳米复合材料的微型电极用于地下水重金属检测 Article

薛博元, 杨倩, 夏楷东, 李志宏, 陈宇徽, 张大奕, 周小红

《工程（英文）》 2023年第27卷第8期页码 199-208 doi: 10.1016/j.eng.2022.06.005

摘要：

Heavy metals, notably Pb²⁺ and Cu²⁺, are some of the most persistent contaminants found in groundwater. Frequent monitoring of these metals, which relies on efficient, sensitive, cost-effective, and reliable methods, is a necessity. We present a nanocomposite-based miniaturized electrode for the concurrent measurement of Pb²⁺ and Cu²⁺ by exploiting the electroanalytical technique of square wave voltammetry. We also propose a facile in situ hydrothermal calcination method to directly grow binder-free mesoporous NiO on a three-dimensional nickel foam, which is then electrochemically seeded with gold nanoparticles (AuNPs). The meticulous design of a low-barrier Ohmic contact between mesoporous NiO and AuNPs facilitates target-mediated nanochannel-confined electron transfer within mesoporous NiO. As a result, the heavy metals Pb²⁺ (0.020 mg·L⁻¹ detection limit, 2.0–16.0 mg·L⁻¹detection range) and Cu²⁺ (0.013 mg·L⁻¹ detection limit, 0.4–12.8 mg·L⁻¹ detection range) can be detected simultaneously with high precision. Furthermore, other heavy metal ions and common interfering ions found in groundwater showed negligible impacts on the electrode's performance, and the recovery rate of groundwater samples varied between 96.3% ± 2.1% and 109.4% ± 0.6%. The compactness, flexible shape, low power consumption, and ability to remotely operate our electrode pave the way for onsite detection of heavy metals in groundwater, thereby demonstrating the potential to revolutionize the field of environmental monitoring.

关键词： AuNPs Mesoporous NiO Miniaturized electrode Heavy metal ions Groundwater Square wave voltammetry