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DOI | 10.5194/acp-17-7495-2017 |
Experimental determination of Henry's law constants of difluoromethane (HFC-32) and the salting-out effects in aqueous salt solutions relevant to seawater | |
Kutsuna, Shuzo | |
2017-06-21 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:12 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | Gas-to-water equilibrium coefficients, K-eq(S) (in Matm(-1)), of difluoromethane (CH2F2), a hydrofluoro-carbon refrigerant (HFC-32), in aqueous salt solutions relevant to seawater were determined over a temperature (T) range from 276 to 313K and a salinity (S) range up to 51% by means of an inert-gas stripping method. From the van't Hoff equation, the K-eq(S) value in water, which corresponds to the Henry's law constant (K-H), at 298K was determined to be 0.065 M atm(-1). The salinity dependence of K-eq(S) (the salting-out effect), ln (K-H/K-eq(S)), did not obey the Sechenov equation but was proportional to S-0.5. Overall, the K-eq(S)(T) value was expressed by ln(K-eq(S)(T)) = -49.71 + (77.70 - 0.134 X S-0.5) x (100 / T) + 19.14 x ln (T / 100). By using this equation in a lower-tropospheric semi-hemisphere (30-90 degrees S) of the Advanced Global Atmospheric Gases Experiment (AGAGE) 12-box model, we estimated that 1 to 4% of the atmospheric burden of CH2F2 resided in the ocean mixed layer and that this percentage was at least 4% in the winter; dissolution of CH2F2 in the ocean may partially influence estimates of CH2F2 emissions from long-term observational data of atmospheric CH2F2 concentrations. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000436509800001 |
WOS关键词 | GAS STRIPPING METHOD ; ATMOSPHERIC OBSERVATIONS ; ACTIVITY-COEFFICIENTS ; INFINITE DILUTION ; GLOBAL EMISSIONS ; OCEANIC UPTAKE ; WATER ; SOLUBILITY ; TRENDS ; CFCS |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/18379 |
专题 | 地球科学 |
作者单位 | Natl Inst Adv Ind Sci & Technol, 16-1 Onogawa, Tsukuba, Ibaraki 3058569, Japan |
推荐引用方式 GB/T 7714 | Kutsuna, Shuzo. Experimental determination of Henry's law constants of difluoromethane (HFC-32) and the salting-out effects in aqueous salt solutions relevant to seawater[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(12). |
APA | Kutsuna, Shuzo.(2017).Experimental determination of Henry's law constants of difluoromethane (HFC-32) and the salting-out effects in aqueous salt solutions relevant to seawater.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(12). |
MLA | Kutsuna, Shuzo."Experimental determination of Henry's law constants of difluoromethane (HFC-32) and the salting-out effects in aqueous salt solutions relevant to seawater".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.12(2017). |
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