Advances in the Study of the Denitrifier Method for the Measurement of Isotopic Compositions of Nitrate
Received date: 2009-09-01
Revised date: 2010-01-25
Online published: 2010-04-10
Supported by
The denitrifier method for determination of nitrogen and oxygen isotopes of nitrate in groundwater and soil
In the 21st century, the significant advances in the measurement of nitrogen and oxygen isotopic compositions of nitrate are the development of analytical techniques of the denitrifier method. The method has many advantages, such as simultaneous analysis of nitrogen and oxygen isotopic compositions of samples with low NO3- concentrations down to μg/L, relief from complicated sample pretreatment, a large reduction in analysis time, only conversion of NO3- in samples to N2O in complex solutions and so on. The experimental procedure consists of several key steps including bacterium selection and cultivation, conversion of sample NO3- to N2O, extraction and isotopic analysis of N2O and correction of isotopic analytical results. Results from foreign researchers showed that the technique was applicable for the measurement from soil, seawater and freshwater, and was widely used. This technique was also developed in and obtained important advances in the contamination study of nitrate in the vadose zone and groundwater. Because of its advanced analytical technique, We suggest great efforts be given to its research and application in China. Concerned agencies in charge should give more support to the study so that the technique can be modified further and applied widely.
ZHANG Cui-Yun , ZHANG Jun-Xia , MA Lin-Na , ZHANG Qing , YIN Mi-Yang , LI Zheng-Hong . Advances in the Study of the Denitrifier Method for the Measurement of Isotopic Compositions of Nitrate[J]. Advances in Earth Science, 2010 , 25(4) : 360 -364 . DOI: 10.11867/j.issn.1001-8166.2010.04.0360
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