Microplastics are small plastic particles, typically less than 5 millimeters in diameter. They originate from a variety of plastic materials, which consist of numerous chemical compounds. Here is a list of common polymers and chemical compounds responsible for the formation of microplastics: Polymers Additives and Chemical Compounds These compounds are often released into the environment…
SIFT-MS Analytic Method These Direct Injection Mass Spectrometry (DIMS) techniques rely on calibrating instruments using standards with known concentrations and protonated ion signals. Although the most accurate analysis requires calibrating the instrument for each volatile organic compound (VOC) in a complex gas mixture, this process is both labor-intensive and time-consuming. In practice, obtaining precise standards…
Soft chemical ionization is a powerful analytical technique employed in Selected Ion Flow Tube Mass Spectrometry (SIFT-MS) for the precise detection and quantification of trace gases, particularly volatile organic compounds (VOCs), present in ambient air samples. This method hinges on the interaction of selected reagent ions with VOCs within a controlled environment, allowing for rapid…
Gaussian jobs generate large amounts of intermediate data that are too enormous for checkpoint files to store. Instead, this data is stored in RWF files, which are designed to handle large data volumes. If a Gaussian job is interrupted due to power failure or other reasons, the RWF files contain important data that can be…
Chemical ionization mass spectrometry Chemical ionization mass spectrometry (CI-MS) is a technique used to analyze chemical compounds by ionizing them in the gas phase using chemical reactions rather than electron impact ionization, which is commonly used in electron ionization mass spectrometry (EI-MS). In CI-MS, the sample molecules are ionized by reacting them with reagent ions…
Comprehensive Review: iPad with A12 Bionic Chip I’ve been using the iPad Air 3 since 2019, and it continues to perform smoothly without any lag. Simply closing and opening the cover wakes it up instantly. This device is perfect for reading, taking notes, listening to music, watching videos, and even drawing. For reading, the experience…
