干旱区生态环境知识资源中心(Arid): Stable nitrogen and oxygen isotope fractionation during precipitation of nitrate salt from saturated solutions

Arid

DOI	10.1002/rcm.8905
	Stable nitrogen and oxygen isotope fractionation during precipitation of nitrate salt from saturated solutions
	Welsh, Hannah; Gueorguieva, Gloria-Alexandra; Kounaves, Samuel; Amundson, Ronald
通讯作者	Amundson, R
来源期刊	RAPID COMMUNICATIONS IN MASS SPECTROMETRY
ISSN	0951-4198
EISSN	1097-0231
出版年	2020
卷号	34 期号:22
英文摘要	Rationale Nitrate is an oxyanion similar to CO(3)(-)and thus should undergo stable N and O isotope fractionation during dissolution or precipitation. This process should dominate abiotic soil nitrate processes in hyperarid regions of Earth and possibly Mars. Methods The N and O isotope fractionations during the precipitation of nitrate salt from saturated solutions at similar to 20 degrees C were determined by two methods: rapid precipitation by antisolvent crystallization and slow uninhibited precipitation in a desiccator. In the antisolvent crystallization procedure, increasing volumes of acetone were added to samples of saturated sodium and strontium nitrate solutions to instantaneously precipitate nitrate salt. In the slow procedure (requiring weeks), slow evaporative water loss drove the process. Results There was little difference between the two procedures. Using a Rayleigh model, the calculated N fractionation ((15)epsilon(product-residual)) ranged from 1.69 parts per thousand to 2.77 parts per thousand, whereas for O, the(18)epsilon(product-residual)values were between 1.27 parts per thousand and 4.61 parts per thousand. The N isotope fractionation between NO(3)(-)and the metal solid is similar to that between C in dissolved CO(3)(-2)and carbonates. We found that O versus N isotope plots of soil nitrate in a cold/dry Antarctic chronosequence had slopes similar to those from the experiments, revealing abiotic transport. In the Atacama Desert, where the soil nitrates are a mix of biological and tropospheric nitrate, there is an inverse relationship between soil N and O isotopes. These two relationships were compared with the isotope composition of nitrate from Martian meteorite EETA79001. Conclusions While the N and O isotope composition of the Martian nitrate is remarkably similar to that of the present Atacama Desert, the interpretation of the slope of the O versus N isotopes remains ambiguous due to the limited number of samples. Additional NO(3)samples from Martian meteorites are needed to address the question of abiotic versus biotic alteration of NO(3)(-)on Mars.
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000583377300009
WOS关键词	PERCHLORATE
WOS类目	Biochemical Research Methods ; Chemistry, Analytical ; Spectroscopy
WOS研究方向	Biochemistry & Molecular Biology ; Chemistry ; Spectroscopy
来源机构	University of California, Berkeley
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327186
作者单位	[Welsh, Hannah; Gueorguieva, Gloria-Alexandra; Amundson, Ronald] Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA; [Kounaves, Samuel] Tufts Univ, Dept Chem, Medford, MA USA
推荐引用方式 GB/T 7714	Welsh, Hannah,Gueorguieva, Gloria-Alexandra,Kounaves, Samuel,et al. Stable nitrogen and oxygen isotope fractionation during precipitation of nitrate salt from saturated solutions[J]. University of California, Berkeley,2020,34(22).
APA	Welsh, Hannah,Gueorguieva, Gloria-Alexandra,Kounaves, Samuel,&Amundson, Ronald.(2020).Stable nitrogen and oxygen isotope fractionation during precipitation of nitrate salt from saturated solutions.RAPID COMMUNICATIONS IN MASS SPECTROMETRY,34(22).
MLA	Welsh, Hannah,et al."Stable nitrogen and oxygen isotope fractionation during precipitation of nitrate salt from saturated solutions".RAPID COMMUNICATIONS IN MASS SPECTROMETRY 34.22(2020).