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

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	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, Xin 2; Walz, Peter M.1; Luna, Melissa 1,3; Brewer, Peter G.1
刊名	MARINE CHEMISTRY
	2016-08-20
卷号	184 页码:32-42
关键词	pH Porewater Raman spectroscopy Reducing sediments
英文摘要	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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000380080100004
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.qdio.ac.cn/handle/337002/130887]
专题	海洋研究所_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.