Research Article
Evaluation of Two Spectrometric Approaches for Measuring Metal Concentrations in Drinking Water
Issue:
Volume 13, Issue 3, September 2025
Pages:
63-67
Received:
29 August 2025
Accepted:
11 September 2025
Published:
9 October 2025
Abstract: This study aimed to compare the performance of photometric analysis and flame atomic absorption spectrophotometry (FAAS) in determining iron concentrations in water samples. Thirty samples were collected from wells located in the Anani and Gonzacque-ville neighborhoods and analyzed using both techniques. Photometric results indicated that 26 out of 30 samples had iron concentrations below the Ivorian regulatory limit of 0.3mg/L, while three samples exceeded this threshold. In contrast, AAS measurements showed that all samples complied with the standard, with no exceedances recorded. Statistical analysis revealed a significant difference between the two methods, with photometric readings generally yielding higher iron concentrations than those obtained via AAS. This discrepancy highlights the importance of employing more precise analytical techniques such as FAAS for routine water quality monitoring, particularly when assessing critical parameters like iron.
Abstract: This study aimed to compare the performance of photometric analysis and flame atomic absorption spectrophotometry (FAAS) in determining iron concentrations in water samples. Thirty samples were collected from wells located in the Anani and Gonzacque-ville neighborhoods and analyzed using both techniques. Photometric results indicated that 26 out of...
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Research Article
Ultra-broadband Tunable Terahertz Absorber Based on Hollow Fan Patterned VO2 Metamaterials
Issue:
Volume 13, Issue 3, September 2025
Pages:
22-30
Received:
25 August 2025
Accepted:
12 September 2025
Published:
14 November 2025
DOI:
10.11648/j.sjac.20250902.12
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Abstract: A novel design of ultra-broadband tunable terahertz (THz) absorber based on hollow fan patterned VO2 metamaterials is proposed and investigated. Our designed metamaterial absorber (MA) is aimed at expanding the absorption bandwidth, simplifying the structure and reducing the volume as much as possible. It is really proved from simulation results that the proposed MA has not only simple structure and small volume but also ultra-broadband absorption above 90% ranging from 2.92 THz to 10.05 THz. Comparing with previous studies, the proposed MA greatly improved its performances in several aspects of absorption bandwidth, tunable range, simple structure and small volume. Increasing the VO2 conductivity from 200 S/m to 2×105 S/m, the absorption rate of proposed MA rapidly increases from 1.2% to 99.2%, thus the proposed MA has the high tuning performance with maximum modulation depth of 98.8%. We also investigate the absorption origin of proposed MA by using the electric field distributions. The proposed MA achieves the ultra-broadband absorption by the fundamental resonance and high-order resonances of hollow fan VO2 pattern. In addition, all the influences of polarization angle, incidence angle and geometrical parameters on the ultra-broadband absorption are analyzed in detail. Our designed MA may be widely utilized for practical applications of THz technology.
Abstract: A novel design of ultra-broadband tunable terahertz (THz) absorber based on hollow fan patterned VO2 metamaterials is proposed and investigated. Our designed metamaterial absorber (MA) is aimed at expanding the absorption bandwidth, simplifying the structure and reducing the volume as much as possible. It is really proved from simulation results th...
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,
Yao Marcelle
