• Journal of Wellbeing Management and Applied Psychology
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• v.7 no.4
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• pp.1-13
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• 2024

Purpose: The purpose of this study is to develop a highly accurate mobile air quality monitoring system suitable for use in various event-specific locations, such as fireworks festivals or construction sites. Research design, data and methodology: The study focuses on optimizing the selection and design of equipment for a mobile air quality monitoring system, aiming to reduce production costs and improve measurement accuracy. It includes a comparative analysis with existing Air Quality Monitoring Stations (AQMS) and enhances calibration methods to stabilize performance under various environmental conditions. This approach ensures a cost-effective, accurate, and efficient mobile air quality monitoring system. Results: By utilizing measurement data collected from various regions, further improvements can be made in the future to develop a more efficient and accurate mobile air quality monitoring system. The accuracy of the existing mobile air quality monitoring system has been enhanced through this study, making it applicable for measurements in various fields. Conclusions: With the growing concern about air pollution, a mobile air quality monitoring system could be effectively utilized in areas where event-based air pollution occurs, such as firework festivals or construction sites. In the future, by utilizing data from various regions, further improvements and enhancements can be made to the system, leading to a more efficient and accurate mobile air quality monitoring system.

• Food Science of Animal Resources
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• v.35 no.6
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• pp.765-771
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• 2015

The development of a sample preparation method and optimization of the analytical instrumentation conditions were performed for the determination of the vitamin B₁₂ content in emulsified baby foods sold on the Korea market. After removal of the milk protein and fats by chloroform extraction and centrifugation, the vitamin B₁₂ was water extracted from the sample. Following filtration of the solution through a nylon filter, the water-soluble extract was purified by solid-phase extraction using a Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS). The solution eluted from the cartridge was dried under a stream of nitrogen gas and reconstituted with 1 mL of water. The sample solution was injected into an LC-MS/MS system after optimizing the mobile phase for vitamin B₁₂ detection. The calibration curve showed good linearity with the coefficient of correlation (r²) value of 0.9999. The limit of detection was 0.03 µg/L and the limit of quantitation was 0.1 µg/L. The method of detection limit was 0.02 µg/kg. The vitamin B₁₂ recovery from a spiking test was 99.62% for infant formula and 99.46% for cereal-based baby food. The sample preparation method developed in this study would be appropriate for the rapid determination of the vitamin B₁₂ content in infant formula and baby foods with emulsified milk characteristics. The ability to obtain stable results more quickly and efficiently would also allow governments to exercise a more extensive quality control inspection and monitoring of products expected to contain vitamin B₁₂. This method could be implemented in laboratories that require time and labor saving.