Joanna V. Egan*, Alexander D. James and John M. C. Plane*,
{"title":"金星条件下氯化铁（FeCl3）的实验室测量","authors":"Joanna V. Egan*, Alexander D. James and John M. C. Plane*, ","doi":"10.1021/acsearthspacechem.5c00132","DOIUrl":null,"url":null,"abstract":"<p >Ferric chloride (FeCl<sub>3</sub>) in sulfuric acid cloud droplets has been proposed to explain the inhomogeneous near-ultraviolet (UV) absorption visible at the Venusian cloud tops. However, the absorption spectrum of FeCl<sub>3</sub> in concentrated sulfuric acid does not appear to have been measured previously; here we report measurements under appropriate conditions of temperature and H<sub>2</sub>SO<sub>4</sub>/H<sub>2</sub>O solution strengths. The choice of solvent has a significant effect on the measured spectrum. The reaction of FeCl<sub>3</sub> in aqueous H<sub>2</sub>SO<sub>4</sub> to form ferric sulfate (Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>) was shown to be suppressed by adding HCl to the solution (as would occur in the Venusian atmosphere). The FeCl<sub>3</sub> spectrum in sulfuric acid is shown to be in good agreement with observations of the unknown absorber in Venus’ atmosphere. The presence of Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>, which absorbs strongly below 320 nm, should be considered when reconstructing Venusian spectra to avoid misattribution of absorption in this spectral region to SO<sub>2</sub>, potentially leading to an overestimation of the SO<sub>2</sub> cloud top concentrations.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"9 8","pages":"2127–2136"},"PeriodicalIF":2.9000,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acsearthspacechem.5c00132","citationCount":"0","resultStr":"{\"title\":\"Laboratory Measurements of Ferric Chloride (FeCl3) under Venusian Conditions\",\"authors\":\"Joanna V. Egan*, Alexander D. James and John M. C. Plane*, \",\"doi\":\"10.1021/acsearthspacechem.5c00132\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >Ferric chloride (FeCl<sub>3</sub>) in sulfuric acid cloud droplets has been proposed to explain the inhomogeneous near-ultraviolet (UV) absorption visible at the Venusian cloud tops. However, the absorption spectrum of FeCl<sub>3</sub> in concentrated sulfuric acid does not appear to have been measured previously; here we report measurements under appropriate conditions of temperature and H<sub>2</sub>SO<sub>4</sub>/H<sub>2</sub>O solution strengths. The choice of solvent has a significant effect on the measured spectrum. The reaction of FeCl<sub>3</sub> in aqueous H<sub>2</sub>SO<sub>4</sub> to form ferric sulfate (Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>) was shown to be suppressed by adding HCl to the solution (as would occur in the Venusian atmosphere). The FeCl<sub>3</sub> spectrum in sulfuric acid is shown to be in good agreement with observations of the unknown absorber in Venus’ atmosphere. The presence of Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>, which absorbs strongly below 320 nm, should be considered when reconstructing Venusian spectra to avoid misattribution of absorption in this spectral region to SO<sub>2</sub>, potentially leading to an overestimation of the SO<sub>2</sub> cloud top concentrations.</p>\",\"PeriodicalId\":15,\"journal\":{\"name\":\"ACS Earth and Space Chemistry\",\"volume\":\"9 8\",\"pages\":\"2127–2136\"},\"PeriodicalIF\":2.9000,\"publicationDate\":\"2025-07-23\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://pubs.acs.org/doi/pdf/10.1021/acsearthspacechem.5c00132\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ACS Earth and Space Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acsearthspacechem.5c00132\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Earth and Space Chemistry","FirstCategoryId":"92","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsearthspacechem.5c00132","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Laboratory Measurements of Ferric Chloride (FeCl3) under Venusian Conditions
Ferric chloride (FeCl3) in sulfuric acid cloud droplets has been proposed to explain the inhomogeneous near-ultraviolet (UV) absorption visible at the Venusian cloud tops. However, the absorption spectrum of FeCl3 in concentrated sulfuric acid does not appear to have been measured previously; here we report measurements under appropriate conditions of temperature and H2SO4/H2O solution strengths. The choice of solvent has a significant effect on the measured spectrum. The reaction of FeCl3 in aqueous H2SO4 to form ferric sulfate (Fe2(SO4)3) was shown to be suppressed by adding HCl to the solution (as would occur in the Venusian atmosphere). The FeCl3 spectrum in sulfuric acid is shown to be in good agreement with observations of the unknown absorber in Venus’ atmosphere. The presence of Fe2(SO4)3, which absorbs strongly below 320 nm, should be considered when reconstructing Venusian spectra to avoid misattribution of absorption in this spectral region to SO2, potentially leading to an overestimation of the SO2 cloud top concentrations.
期刊介绍：
The scope of ACS Earth and Space Chemistry includes the application of analytical, experimental and theoretical chemistry to investigate research questions relevant to the Earth and Space. The journal encompasses the highly interdisciplinary nature of research in this area, while emphasizing chemistry and chemical research tools as the unifying theme. The journal publishes broadly in the domains of high- and low-temperature geochemistry, atmospheric chemistry, marine chemistry, planetary chemistry, astrochemistry, and analytical geochemistry. ACS Earth and Space Chemistry publishes Articles, Letters, Reviews, and Features to provide flexible formats to readily communicate all aspects of research in these fields.
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