Anton Petrenko, Serhii Kulyk, Oleksandr Lameko, Volodymyr Melnyk, Liudmyla Ovchar, Oleksandra Manska, Olena Shcherbakova, Oleksandr Melnykov
Suggestions for establishing metrological traceability and respect metrological traceability chain scheme for protein content measurements in food are presented. The most common methods for determining protein content in organic and inorganic substances are reviewed. Particular attention is given to the Kjeldahl method. A method is proposed for ensuring metrological traceability of the Kjeldahl method results through the use of 2-amino-2-(hydroxymethyl)-1,3-propanediol (Tris base) and hydrochloric or sulfuric acid solutions, whose concentrations are traceable to a primary method—constant...
IMEKO TC8, TC11 and TC24 Conference
· TC8
· 2025
· 10.21014/tc8-2025.017
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John Kenneth Valerio, Aldrin Jan Tabuso, Anton John Rocha, Alleni Junsay, Kim Christopher Aganda
Mercury (Hg) is a naturally occurring element that is released to bodies of water through anthropogenic activities, industrial discharges, or from the existing Hg in soils. Its presence can cause bioaccumulation in aquatic species, which poses potential health risks when taken for human consumption. The most common method for elemental analysis in fish samples is inductively coupled plasma (ICP) spectroscopy, which is highly accurate but has high cost and analysis time. Recently, X-ray fluorescence (XRF) has gained attention for its heavy metal detection capability, which is cheaper and...
IMEKO TC8, TC11 and TC24 Conference
· TC24
· 2025
· 10.21014/tc24-2025.016
· Download
Abegail Santillan, Marianne Therese Bauca, Lynne Jerisa Castro, Zamantha Nadir Martin, Araceli Monsada
The Semiconductor and Electronics (S&E) sector is vital to the Philippine economy, with copper (Cu) extensively used in semiconductor packaging. However, Cu’s susceptibility to oxidation can impair leadframe reliability. This study establishes an Auger electron spectroscopy (AES) spectral profiling database to identify oxidation states in Cu alloy-based leadframes, using the Intelligent Data Analysis System (IDAS) developed by DOST-ITDI and ASTI. Oxidation was simulated via controlled heat treatment, with surface changes analyzed through optical microscopy, FE-SEM, EDS, and AES. Optimized...
IMEKO TC8, TC11 and TC24 Conference
· TC24
· 2025
· 10.21014/tc24-2025.015
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Lynne Jerisa A. Castro, Jane Cathleen B. Gabunada, Clarisse Jasmine J. Carlos, Charisse M. Mendoza, Angelene J. Alcain, John Paul D. Arcilla, Alec N. Tobias, Kim Christopher C. Aganda, Araceli M. Monsada
The reliable detection and analysis of microplastics (MPs) are crucial for the development of solutions to mitigate their potential impacts on the environment and human health. However, the removal of biological materials remains a significant challenge as MPs may be obscured by biological matter, complicating their isolation. This study optimized the digestion and extraction of MPs from milkfish parts using KOH combined with a dual-density separation involving NaCl and NaI solutions. Reference micropolymers were spiked into the fish parts to assess % recovery. Results revealed excellent...
IMEKO TC8, TC11 and TC24 Conference
· TC24
· 2025
· 10.21014/tc24-2025.014
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Kiril Demerdziev, Vladimir Dimchev
The measurement of reactive power/energy in non-sinusoidal conditions presents several challenges. The primary issue is the ambiguous definition of reactive power in the presence of high order harmonics. International standard IEEE 1459 addresses this by emphasizing fundamental power components for system monitoring, even in polluted conditions. Another challenge is the existence of different measuring algorithms, implemented in modern devices, which yield consistent response for sinusoidal waveforms, but differ under harmonically distorted voltages and currents. This study experimentally...
IMEKO TC8, TC11 and TC24 Conference
· TC11
· 2025
· 10.21014/tc11-2025.013
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Vedran Šimunović, Vilim Kožuh, Gorana Baršić
Only a few of the most advanced national metrology institutes have a Calibration and Measurement Capabilities calibration service in the BIPM Key Comparison Database to calibrate piezoelectric actuators. Given the importance of precise displacement measurements in various high-precision applications, research on the feasibility of calibrating a piezoelectric actuator using a laser interferometer was conducted at the Croatian National Laboratory for Length. In this research a displacement actuator P–621.ZCD, manufactured by Physik Instrumente, has been calibrated using Renishaw ML10 laser...
IMEKO TC8, TC11 and TC24 Conference
· TC11
· 2025
· 10.21014/tc11-2025.012
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Argielou Flores, Kiveen Suycano, Jessie Yap, Jheison Corpus, Willard German, Patrick Karlvin Pimentel, Jomari Madlangbayan, Janelle Caringal
Calibration of mass standards using manual mass comparators requires the repetitive loading and unloading of masses. The routine heavy-lifting could pose a threat to the integrity of the mass comparator and musculoskeletal health of the personnel. This study developed an automated rotary plate that served as an accessory for existing manual comparators in the laboratory. It is programmed to mimic the calibration process by alternately conveying the reference and test mass standards to and from the comparator. The results showed that the new calibration system can produce repeatability...
IMEKO TC8, TC11 and TC24 Conference
· TC11
· 2025
· 10.21014/tc11-2025.011
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Bartlomiej Cieszynski, Joao Gregorio
The application of artificial intelligence and machine learning algorithms in healthcare has grown exponentially in recent years, offering benefits such as improving diagnostic accuracy, efficiency, and addressing challenges such as interpretative bias or the increasing volume of patient data. However, ensuring the reliability of such models necessitates robust evaluations of their sensitivity to data quality – the extent to which data meets required standards. This study explores how variations in data accuracy, precision, and completeness affect an algorithms’ ability to correctly classify...
IMEKO TC8, TC11 and TC24 Conference
· TC8
· 2025
· 10.21014/tc8-2025.010
· Download
Pauline Ann Quiton, Aaron Dacuya, Johnester Maniego, Angelo Bryan Lazo, Christian D. Lario, Clarissa J. Gatchalian, Elyson Keith P. Encarnacion, Cyril C. Ramil, Alleni T. Junsay, Benilda S. Ebarvia
This study assesses the analytical performance of Philippine chemical laboratories in determining sulfite levels in dried mango and desiccated coconut, two major export products. The accuracy-based proficiency testing (PT) schemes, organized by the National Metrology Laboratory of the Philippines, aimed to ensure accurate sulfite measurement for food safety and market acceptance. Participants' performance was evaluated against assigned values obtained using liquid chromatography-isotope dilution mass spectrometry (LC-IDMS). Results showed that 40% (2 of 5) of laboratories achieved...
IMEKO TC8, TC11 and TC24 Conference
· TC24
· 2025
· 10.21014/tc24-2025.009
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Ramona Russo, Francesca Rolle, Francesca Durbiano, Francesca Romana Pennecchi, Stefano Pavarelli, Michela Sega
Indoor air quality (IAQ) monitoring has gained significant attention due to its impact on human health. Low-cost sensors allow widespread data collection but often lack proper characterisation and standard validation, affecting reliability. The Italian PRIN project "MIRABLE” - Measurement Infrastructure for Research on heAlthy and zero energy Buildings in novel Living lab Ecosystems - led by Italian National Metrology Institute, INRiM, and Politecnico di Torino, aims to develop a measurement infrastructure for monitoring multi-domain indoor environmental conditions using low-cost sensors. In...
IMEKO TC8, TC11 and TC24 Conference
· TC8
· 2025
· 10.21014/tc8-2025.008
· Download