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Analytical Letters Volume 50, 2017 - Issue 13
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MASS SPECTROMETRY

Determination of Nitrogen and Oxygen Isotopes in Nitrates: A Minireview

Shouhui DaiEquipment Public Service Center, Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
,
Luhua XieKey Laboratory of Ocean and Marginal Sea Geology, State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, ChinaCorrespondence[email protected]
,
Long PengState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
,
Hui YangPublic Monitoring Center for Agro-product, Guangdong Academy of Agricultural Sciences, Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality, Ministry of Agriculture, Guangzhou, China
,
Huilong XuEquipment Public Service Center, Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, ChinaCorrespondence[email protected]
,
Qi ShenEquipment Public Service Center, Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
,
Xinhui BiState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
,
Yun ZhangEquipment Public Service Center, Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
&
Aijun SunEquipment Public Service Center, Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
 show all
Pages 2045-2057 | Received 18 Sep 2016, Accepted 24 Nov 2016, Published online: 07 Sep 2017
 
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ABSTRACT

Nitrogen and oxygen isotope ratios (δ15N and δ18O) in nitrates are important in hydrology, oceanography, atmospheric chemistry, and agriculture. This paper reviews current isotope ratio mass spectrometry methods for the determination of nitrogen and oxygen isotopes in nitrates that include graphite combustion, AgNO3-ion exchange, Ba(NO3)2-acetone, two-step chemical conversion, bacterial approaches, and off-axis integral cavity output laser spectroscopy. This paper introduces the principles, processes, advantages, and disadvantages of these procedures. Future studies should focus on the determination of oxygen isotopes. The development of novel spectroscopic or other isotopic methodology may also be new research directions. In addition, in some nitrates, δ17O is more sensitive than traditional δ18O and further development for this isotope is of interest. In addition, the determination of δ17O may be used to more accurately evaluate δ18O.

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