| In situ Raman measurement of HS- and H2S in sediment pore waters and use of the HS-:H2S ratio as an indicator of pore water pH | |
| Peltzer, Edward T.1; Zhang, Xin2; Walz, Peter M.1; Luna, Melissa1,3; Brewer, Peter G.1 | |
| 2016-08-20 | |
| 发表期刊 | MARINE CHEMISTRY
 |
| 卷号 | 184页码:32-42 |
| 文章类型 | Article |
| 摘要 | The smell of hydrogen sulfide upon recovery of deep sea cores from areas of reducing sediments is familiar to most ocean scientists and is simple testimony to the problem of dissolved gas loss during core recovery and processing. For this reason methods of in situ measurement of sulfide and other gases are keenly sought, and both microelectrode and spectroscopic measurements have been widely used. We report here on the use of a robust 50 cm long titanium pore water probe combined with a laser Raman sensing system for in situ measurement of the sulfide concentration and sulfide speciation status of deep sea sediment pore waters. Uniquely the Raman signal spectroscopically senses and simultaneously resolves both the H2S (v(1) 2592 Delta cm(-1)) and HS- (v(1) 2573 Delta cm(-1)) species. We have calibrated the Raman response factors as a function of pH and found that the Raman cross section for HS- is a factor of 1.563 greater than for the H2S form. We have carried out stepwise profiling of the pore water chemistry (CH4, SO42-, H2S, HS-) of highly reducing sediments in the Santa Monica Basin and from the combined sulfide species we can assess total dissolved sulfide. Since the ratio of HS-:H2S is a well-defined function of pH with the pK for this equilibrium being close to 7.0, and since the pH of many sediment pore waters is also close to 7 then the observed HS-:H2S ratio provides an elegant pH sensitive "dye". We have solved the required Raman-equilibrium relationships and show that the in situ pH of sulfide rich pore waters can be determined rapidly and directly from these observations. Several field examples are provided. (C) 2016 Elsevier B.V. All rights reserved. |
| 关键词 | Ph Porewater Raman Spectroscopy Reducing Sediments |
| DOI | 10.1016/j.marchem.2016.05.006 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000380080100004 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 版本 | 出版稿 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/130887 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.Monterey Bay Aquarium Res Inst, 7700 Sandholdt Rd, Moss Landing, CA 95039 USA 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, 7 Nanhai Rd, Qingdao 266071, Shandong, Peoples R China 3.Univ Washington, Seattle, WA 98195 USA |
| 推荐引用方式 GB/T 7714 | Peltzer, Edward T.,Zhang, Xin,Walz, Peter M.,et al. In situ Raman measurement of HS- and H2S in sediment pore waters and use of the HS-:H2S ratio as an indicator of pore water pH[J]. MARINE CHEMISTRY,2016,184:32-42. |
| APA | Peltzer, Edward T.,Zhang, Xin,Walz, Peter M.,Luna, Melissa,&Brewer, Peter G..(2016).In situ Raman measurement of HS- and H2S in sediment pore waters and use of the HS-:H2S ratio as an indicator of pore water pH.MARINE CHEMISTRY,184,32-42. |
| MLA | Peltzer, Edward T.,et al."In situ Raman measurement of HS- and H2S in sediment pore waters and use of the HS-:H2S ratio as an indicator of pore water pH".MARINE CHEMISTRY 184(2016):32-42. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| In situ Raman measur（1412KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
修改评论