The effect of salt and temperature on the infinite dilution activity coefficients of volatile organic chemicals in water |
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| Institution: | 1. Institut für Technische Thermodynamik und Kältetechnik, Universität Karlsruhe (TH), Karlsruhe, Germany;2. Center for Molecular and Engineering Thermodynamics, Department of Chemical Engineering, University of Delaware, Newark, DE 19716, USA;1. Key Laboratory of Low-grade Energy Utilization Technologies & Systems of Ministry of Education of China, College of Power Engineering, Chongqing University, Chongqing 400044, China;2. Institute of Energy and Environment of Chongqing University, Chongqing 400044, China;1. School of Chemistry and Environmental Engineering, Yancheng Teachers University, Yancheng, Jiangsu 224002, People’s Republic of China;2. College of Chemistry & Chemical Engineering, YangZhou University, YangZhou, Jiangsu 225002, People’s Republic of China;1. Institute of Nanoscience and Nanotechnology, University of Kashan, Kashan, Iran;2. Catalyst and Advanced Materials Research Laboratory, Chemical Engineering Department, Faculty of Engineering, University of Kashan, Kashan, Iran;1. Medical Laboratory Techniques Department, Al-maarif University College, Al-anbar-Ramadi, Iraq;2. Medical Physics Department, Al-Mustaqbal University College, 51001 Hillah, Babil, Iraq;3. Department of Radiology and Medical Imaging, College of Applied Medical Sciences, Prince Sattam bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia;4. Faculty of Health, University of Canberra, Canberra, ACT, Australia;5. Institute of Pharmacy, Sechenov First Moscow State Medical University, 8 Trubetskaya St., bldg. 2, Moscow 119991, Russian Federation;6. Laboratory of Food Chemistry, Federal Research Center of Nutrition, Biotechnology and Food Safety, 2/14 Ustyinsky pr., Moscow 109240, Russian Federation;7. Faculty of Nursing, HRH Princess Chulabhorn College of Medical Science, Chulabhorn Royal Academy, Bangkok, Thailand |
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| Abstract: | We have measured the infinite dilution activity coefficients for five volatile organic compounds (dichloromethane, chloroform, 1,2-dichloroethane, trichloroethylene and benzene) in aqueous salt solutions over the temperature range of 10°C to 40°C, and sodium chloride concentrations from 0 to 2.5 M using headspace gas chromatography. These data were easily fit as a function of salt concentration using the Setschenow expression, and as a function of temperature. By taking derivatives of the fitted data as a function of temperature, one obtains estimates of the partial molar excess enthalpy and entropy at infinite dilution of the organic chemicals as a function of temperature and salt concentration. |
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