Determination of Nitrogen Isotope of Water Samples with Low Ammonium Nitrogen by Ion Exchange Method

Jing HU; Wei-guo LIU

Rock and Mineral Analysis > 2013 > 32(3): 495-501.

Jing HU, Wei-guo LIU. Determination of Nitrogen Isotope of Water Samples with Low Ammonium Nitrogen by Ion Exchange Method[J]. Rock and Mineral Analysis, 2013, 32(3): 495-501.

Citation:

Jing HU, Wei-guo LIU. Determination of Nitrogen Isotope of Water Samples with Low Ammonium Nitrogen by Ion Exchange Method[J]. Rock and Mineral Analysis, 2013, 32(3): 495-501.

Citation:

Jing HU, Wei-guo LIU. Determination of Nitrogen Isotope of Water Samples with Low Ammonium Nitrogen by Ion Exchange Method[J]. Rock and Mineral Analysis, 2013, 32(3): 495-501.

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Determination of Nitrogen Isotope of Water Samples with Low Ammonium Nitrogen by Ion Exchange Method

Jing HU^1,,
Wei-guo LIU^1,2, ,

1.
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment,Chinese Academy of Sciences, Xi′an 710075, China
2.
School of Human Settlement and Civil Engineering, Xi′an Jiaotong University, Xi′an 710049, China

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Received Date: June 19, 2012
Accepted Date: November 17, 2012
Published Date: May 31, 2013

Abstract

ABSTRACT

When the δ¹⁵N-NH₄⁺ in water samples is pretreated by using the ion exchange and diffusion method with NH₄Cl and KCl, the key problem is how to reduce the blank, avoid isotopic fractionation and yield accurate isotope results. In this study, a closed ion exchange system was set up to prevent the small amount of NH₄⁺ contamination to the water samples. Furthermore, the sample and elution flow rates of 1.2 L/h and 0.2 L/h respectively were achieved by adjusting the speed of a peristaltic pump. Thus, both the experiment time and the contamination were reduced. In addition, all of the NH₄⁺ in the sample is absorbed on the ion exchange resin and the N recoveries were from 93.5% to 102.8%. Therefore, the whole process will not cause isotopic fractionation. The blank introduced by KCl was reduced by being heated at 450℃ for 24 h. As a result, the blank ion exchange was reduced to below the detection limit of 0.02 mg/L by using the closed ion exchange system. The problem of contamination for water sample pretreatment in air was solved. The process was accelerated and efficiency was improved

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References (32)

References

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