Quantitative redox measurements for hydrothermal experiments conducted in cold-seal pressure vessels

doi:10.1016/j.chemgeo.2024.122286

	Quantitative redox measurements for hydrothermal experiments conducted in cold-seal pressure vessels
	Fang, Jing 1,2; Chou, I-Ming 3; Audetat, Andreas 1; Zhang, Lipeng 2,4
	2024-09-20
发表期刊	CHEMICAL GEOLOGY
ISSN	0009-2541
卷号	663 页码:9
通讯作者	Fang, Jing(kfangjing@126.com) ; Chou, I-Ming(imchou@idsse.ac.cn)
摘要	The cold-seal pressure vessel (CSPV) is a commonly-used apparatus for hydrothermal experiments performed at crustal temperature (T)-pressure (P) conditions. The redox states of the samples in CSPV hydrothermal experiments are normally controlled by the pressure medium, by using oxygen buffers, or with the Shaw membrane technique. Although these techniques have been widely used, the actual redox states of the samples are not necessarily the expected values and need to be quantitatively measured. In this study, by using CoPd, NiPd, and (NiMn)O redox sensors, quantitative redox measurements have been conducted in H2O-pressurized Ni-superalloy (Inconel 713 LC) CSPVs at 700-800 degrees C and 200 MPa. Oxygen fugacities (fO2) of the H2O pressure medium in three CSPVs used in this study were measured, and their log fO2 values were - 13.11 +/- 0.06 (Ni-NiO (NNO) + 0.7), - 13.05 +/- 0.06 (NNO + 0.8) and - 12.68 +/- 0.07 (NNO + 1.1), comparable with those reported previously. By placing an open capsule containing Ni powder below the sample capsule, the fO2 of the H2O pressure medium can be adjusted to reach that of the NNO buffer (NNO to NNO + 0.2). For the MnO-Mn3O4, Ni-NiO, and Co-CoO oxygen buffers, a steady-state fO2 was always achieved for each buffer at a fixed P-T condition. Measured log fO2 values for the Ni-NiO and Co-CoO buffers are in good agreement with theoretical values calculated from thermodynamic data and also with previous results obtained from vessels pressurized with Ar. The log fO2 values determined for the MnO-Mn3O4 buffer, about 0.3 log unit lower than the theoretical values, are consistent with previous values obtained from vessels pressurized with Ar. These results suggest that the use of H2O pressure medium would not perturb the equilibrium redox states of the oxygen buffers. In addition, we developed a miniature sensor that is small enough to be loaded together with other sample material, allowing the monitoring of fO2 in actual experiments.
关键词	Hydrothermal experiment Oxygen fugacity Cold-seal pressure vessel Oxygen buffer Redox sensor
DOI	10.1016/j.chemgeo.2024.122286
收录类别	SCI
语种	英语
资助项目	Sino-Germany (CSC-DAAD) Postdoctoral Scholarship ; China Postdoctoral Science Foundation[2021M703242] ; National Natural Science Foundation of China[42130109] ; National Natural Science Foundation of China[42303036] ; Natural Science Foundation of Shandong Province[ZR202211170176]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001282639700001
出版者	ELSEVIER
WOS关键词	HIGH-TEMPERATURES ; THERMODYNAMIC DATA ; AQUEOUS FLUIDS ; OXYGEN BUFFERS ; DEGREES-C ; CALIBRATION ; SOLUBILITY ; OXIDATION ; FUGACITY ; SULFUR
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/186175
专题	深海极端环境与生命过程研究中心
通讯作者	Fang, Jing; Chou, I-Ming
作者单位	1.Univ Bayreuth, Bayer Geoinst, D-95440 Bayreuth, Germany 2.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 3.Chinese Acad Sci, Inst Deep Sea Sci & Engn, CAS Key Lab Expt Study Under Deep Sea Extreme Cond, Sanya 572000, Hainan, Peoples R China 4.Laoshan Lab, Lab Marine Geol, Qingdao 266237, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Fang, Jing,Chou, I-Ming,Audetat, Andreas,et al. Quantitative redox measurements for hydrothermal experiments conducted in cold-seal pressure vessels[J]. CHEMICAL GEOLOGY,2024,663:9.
APA	Fang, Jing,Chou, I-Ming,Audetat, Andreas,&Zhang, Lipeng.(2024).Quantitative redox measurements for hydrothermal experiments conducted in cold-seal pressure vessels.CHEMICAL GEOLOGY,663,9.
MLA	Fang, Jing,et al."Quantitative redox measurements for hydrothermal experiments conducted in cold-seal pressure vessels".CHEMICAL GEOLOGY 663(2024):9.