Direct measurements and modeling of congener group specific vapor pressure for chlorinated paraffins
| Autor: | Hidetoshi Kuramochi, Satoshi Endo, Jort Hammer, Hidenori Matsukami |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
China
Environmental Engineering Vapor Pressure Vapor pressure Health Toxicology and Mutagenesis 0208 environmental biotechnology Analytical chemistry 02 engineering and technology 010501 environmental sciences complex mixtures 01 natural sciences COSMO-RS Chlorinated paraffins Hydrocarbons Chlorinated Environmental Chemistry 0105 earth and related environmental sciences Chemistry Public Health Environmental and Occupational Health General Medicine General Chemistry Enthalpy of vaporization Pollution Carbon 020801 environmental engineering Partition coefficient Congener Paraffin Particle Saturation (chemistry) Environmental Monitoring |
| Zdroj: | Chemosphere. 281 |
| ISSN: | 1879-1298 |
| Popis: | Chlorinated Paraffins (CPs) are a complex group of manmade chemicals detected widely in the environment. To predict their environmental fate and effects, it is important to understand their physical-chemical properties including vapor pressure. In this study, the first direct measurements of the vapor pressure for CP congener groups (C10–16Cl4–11) are presented. Vapor pressure was measured above three industrial CP mixtures with different congener distributions between 20 and 50 °C using a gas saturation method. The measured saturated vapor pressure (P∗) decreased with increasing carbon chain length and Cl content. ΔHvap ranged between 73 and 122 kJ mol−1, consistent with data from the literature and model prediction. The experimental log P∗ at 25 °C agreed well with predictions from an empirical regression model in the literature (R2 = 0.97; RSME = 0.25) and with those predicted from the COSMO-RS-trained fragment contribution model (R2 = 0.95; RSME = 0.35). A new empirical model was calibrated with the P∗ data for 35 congener groups measured in this study. Predicted log P∗ values correlate well with field-measured gas/particle partition coefficients and may therefore be used for estimating the environmental fate and pathways of a broad range of CPs in the environment. |
| Databáze: | OpenAIRE |
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