A. A. Arenas, D. Di Luccio, S. Maggi, M. Palmisano, L. A. Salamanca Arévalo, R. A. M. Sanguino, A. Lay-Ekuakille
The presence of heavy metals in the superficial sediments of the Sinú River in Colombia was studied by analyzing soil samples taken along the course of the river at two different depths. Significant concentrations of several heavy metals were found in the samples as a function of the sample location and depth which may be related to the presence of intensive agricultural activities and mining plants in the region surrounding the sampling area. In particular, several sites showed high concentrations of nickel, cadmium and mercury, up to five times larger than the allowable safety limits.
TC19 Symposium: Metrology on Environmental Instrumentation and Measurements (EnvIMEKO 2022)
· TC19
· 2022
· 10.21014/tc19-2022.08
· Download
M. López de Miguel, J. Pablo Salvador, F. Palacio, F. Arreza, A. Diéguez, J. D. Prades
A low-cost and low-powered electro-mechanical device was designed and tested to perform a continuous monitoring tracking of sea contaminants. In particular, we focus our work on the biodetection of Irgarol, a specific seawater contaminant, selected as a proof-of-concept for the measurement system. The device based its measurement on a continuous analyte flow mode over the sensor cavity, followed by a sensor cleaning and regeneration process, which will prepare the sensor for the next measurement. All the system was designed to prioritize accuracy and repeatability.
TC19 Symposium: Metrology on Environmental Instrumentation and Measurements (EnvIMEKO 2022)
· TC19
· 2022
· 10.21014/tc19-2022.07
· Download
A. Assaf, M. Zeghouane, J.-R. Plaussu, S. Cavalagliob, B. Pelissier, F. Bassani, I. Canero-Infante, T. Fiorido, M. Bendahan, S. Monfray, B. Salem, B. Vilquin, A. Souifi
In this work, a high-performance n-type semiconductor gas sensor based on undoped-SnO 2 thin films deposited by a conventional radio- frequency (RF) – magnetron sputtering process was successfully fabricated. The structure, morphology, and chemical composition of the sensing material were investigated using X-ray diffraction (XRD), Atomic Force Microscopy (AFM), and X-ray photoelectron spectroscopy (XPS) respectively. The end results show that the thin film has a poly- crystalline structure with the presence of oxygen vacancies. The resistive sensor architecture has been simulated using TCAD...
TC19 Symposium: Metrology on Environmental Instrumentation and Measurements (EnvIMEKO 2022)
· TC19
· 2022
· 10.21014/tc19-2022.06
· Download
N. Khlifi, C. Zerrouki, N. Fourati, H. Guermazi, S. Guermazi
The present work outlines the co-precipitation synthesis of undoped and -doped CuO NPs with two transition metals (TM), iron (Fe) and nickel (Ni), their characterization, and then their use as photocatalysts for the degradation of pollutants. The structural, morphological, and optical properties of the synthesized CuO NPs are characterized using X- ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and UV–Visible Diffused Reflectance Spectroscopy (DRS), techniques. The photocatalytic activities of the prepared oxide powders are evaluated against...
TC19 Symposium: Metrology on Environmental Instrumentation and Measurements (EnvIMEKO 2022)
· TC19
· 2022
· 10.21014/tc19-2022.05
· Download
T. Aloui, N. Fourati, H. Guermazi, C. Zerrouki, S. Guermazi
Nickel molybdates were synthesized and tested in photocatalytic applications. Experiments conducted in the dark for one hour, showed a degradation efficiency of 44 % of methylene blue (MB), considered as a model pollutant. This high value was related to the strong adsorption of MB on the oxide particles, due to the synergistic effect of the 2D shape (revealed by scanning electron microscopy) developing a large surface area and their high roughness (estimated from atomic force microscopy measurements). Under visible light for one hour, the degradation efficiency reaches 87%, an improvement of...
TC19 Symposium: Metrology on Environmental Instrumentation and Measurements (EnvIMEKO 2022)
· TC19
· 2022
· 10.21014/tc19-2022.04
· Download
F. Hauquier, C. Chapet, L. Dallery
Monitoring of trace organic contaminants in aquatic media has become a major concern today. A 3D-printed device combined MIP-SPE extraction and electrochemical detection was developed for the determination of ethinyl estradiol (EE); one of endocrine-disrupting compounds (EDCs). The proposed method was applied for the detection of EE in river water samples in order to monitor its concentration. A linear response was obtained for analyte in the concentration range from 6.6 to 1064 µg mL -1 , with a quantification limit of 20.0 µg mL -1 .
TC19 Symposium: Metrology on Environmental Instrumentation and Measurements (EnvIMEKO 2022)
· TC19
· 2022
· 10.21014/tc19-2022.03
· Download
A. Lay-Ekuakille, D. P. Bakajika Mukombo, John P. Djungha Okitadiowo, A. Nyengele, C. Lefi, C. Ntuala Ompua, M. Palmisano
Remote sensing has been performing a robust help in addressing issues related to extract information from satellite, and airborne-based platforms. This extraction is certainly a way for making quality and quantity analysis, hence measurements. This paper intends to illustrate the application of the delay and sum beamforming (DSB) approach to characterize satellite maps, in particular Landsat ones, for classifying different soil/land characteristics. The algorithm has been tested to detect the vegetation index from Lansat images of the city of Kinshasa (DR Congo). The DSB has demonstrated to...
TC19 Symposium: Metrology on Environmental Instrumentation and Measurements (EnvIMEKO 2022)
· TC19
· 2022
· 10.21014/tc19-2022.02
· Download
FE. Dbibih, G. Fawaz, M. Vanotti, V. Soumann, V. Blondeau-Patissier
This paper presents a comparative study of three types of surface acoustic waves sensors (SAW) used for particulate matter (PM) detection. These sensors are placed in a cascade impactor as impaction plates. Monitoring their phase variation allows us to know the quantity of fine particles present in the environment with high accuracy. Until now, the sensors used in our prototype are built on quartz substrate and present a good sensitivity to fine particles. One major concern in our application is the fouling of the sensor’s surface with particles upon long periods of exposure. This shaped our...
TC19 Symposium: Metrology on Environmental Instrumentation and Measurements (EnvIMEKO 2022)
· TC19
· 2022
· 10.21014/tc19-2022.01
· Download
Thomas Siefke, Lauryna Siaudinyté, Søren Alkærsig Jensen, Astrid Tranum Rømer, Poul-Erik Hansen
In order to fulfil Moore’s law, the dimensions of the key elements of integrated circuits have been reduced to single digit nanometers. Besides enormous challenges for the micro- and nano fabrication methods itself, metrology is required for quality control to provide sub-nanometer uncertainties. Within the two EU founded projects ATMOC and POLight this challenge is tackled. In real world samples, deviations from the ideal geometries are encountered due to the complexities of fabrication processes. Understanding of these processes guides the development of procedures and helps in the...
TC10 Conference 2023
· TC10
· 2023
· 10.21014/tc10-2023.021
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Poul-Erik Hansen, Lauryna Siaudinyté, Thomas Siefke
One of the most important components in microscopy is the illumination and imaging numerical aperture (NA). Together with the wavelength it sets the final limits and capabilities of the microscopy system. In scatterometry and ptychography a precise knowledge of the NA is required for the reconstruction algorithm. Here the uncertainty of values supplied by the manufactures are often to large, impairing the measurement capability of the system. In this research we demonstrate a method to measure the numerical aperture with high precision and thereby improve optical microscopy measurements.
TC10 Conference 2023
· TC10
· 2023
· 10.21014/tc10-2023.020
· Download