Nitrogen Isotope Analysis Of Ammonium And Glycine
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Download Nitrogen Isotope Analysis of Ammonium and Glycine Book in PDF, Epub and Kindle
Stable isotope techniques can be used as a tool in nitrogen cycling studies of different ecosystems. The studies are based on measurement of the heavy (15N)- to- light (14N) isotopic ratios of nitrogen in different biospheric pools. Isotope ratio mass spectrometry (IRMS) is the most precise technique to use for analysis of nitrogen isotopic ratios. This thesis deals with the development of methods for compound-specific nitrogen isotope analysis of ammonium and glycine in aqueous solutions and soil extracts using Gas Chromatography - Combustion (GC-C) - IRMS. For ammonium, three different techniques were developed: equilibrium headspace analysis, solid phase microextraction (SPME) and the purge and trap (P & T) technique, which were all based on conversion of ammonium to ammonia with subsequent separation of ammonia for analysis. In the SPME and P & T approaches, custom-made absorbents were used for pre-concentration, followed by thermal desorption into the GC-C-IRMS system. For the equilibrium headspace technique, high precision measurements of the nitrogen isotopic ratio were obtained for concentrations above 420 mg N L-1. With further improvements and the use of suitable equipment, the method has the potential to be used for solutions containing ammonium in the low mg N L-1 range. The SPME technique increased the sensitivity by a factor of » 3 compared to the headspace technique, but was less precise. In addition, the NafionÒ material used for absorption showed a memory effect in the desorption step. With the P & T technique a large variation in the measured isotopic value was observed (using solutions containing 2 mg N L-1) which was due to a non-quantitative thermal desorption. However, with further improvements, the P & T technique has the potential to be used for samples containing below 1.0 µg N, which is a much lower amount than that possible with any method used today. A method for determination of the nitrogen isotopic ratio in free glycine in soil extract
Author | : Elin Norlin |
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Total Pages | : 42 |
Release | : 2005 |
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ISBN | : 9789157669834 |
Download Nitrogen Isotope Analysis of Ammonium and Glycine Book in PDF, Epub and Kindle
Author | : Lin Zhang |
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Total Pages | : 150 |
Release | : 2007 |
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Download Innovative Methods for Ammonium and Amino Acid Natural Nitrogen Isotope Ratio Determination Book in PDF, Epub and Kindle
Author | : Isidor Kirshenbaum |
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Total Pages | : 26 |
Release | : 1946 |
Genre | : Ammonia |
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Download New Data Relating to the Separation of the Nitrogen Isotopes by the Exchange Reaction Between Ammonia and Solutions of Ammonium Nitrate Book in PDF, Epub and Kindle
Author | : Louis Harry Roddis |
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Total Pages | : 232 |
Release | : 1948 |
Genre | : Isotopes |
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Download Supplement to the United States Naval Medical Bulletin on Preparation and Measurement of Isotopes and Some of Their Medical Aspects Book in PDF, Epub and Kindle
Author | : Richard M. Cowett |
Publisher | : Springer Science & Business Media |
Total Pages | : 792 |
Release | : 2012-12-06 |
Genre | : Medical |
ISBN | : 1468404008 |
Download Principles of Perinatal-Neonatal Metabolism Book in PDF, Epub and Kindle
Over the last quarter century or so, specialization within obstetrics and gynecology, and pediatrics has resulted in the development of the disciplines of maternal-fetal medicine and neonatology, respectively. A primary focus of maternal-fetal medicine has been to understand the mechanism(s) of premature delivery and develop treatment modalities for improving the length of gestation. A primary focus of neonatology has been to under stand the causes of respiratory distress in the neonate. Success has resulted, not only in the lengthening of gestation, but an improved understanding of the causes and treatment of neonatal respiratory disease. With increasing success has come the necessity to under stand the metabolic principles of the parturient, the fetal/placenta unit, and the neonate. These principles are clearly very important from multiple aspects. Increased understand ing of metabolism of the pregnant woman would explain the aberrations occurring in normal and abnormal pregnancy and improve nutritional support for the parturient. A prime example of altered metabolism is the parturient with diabetes. Understanding metabolism ofthe fetal/placenta unit is necessary to increase the probability that the fetus will be born appropriate for size irrespective of the gestational age. The various compo nents of neonatal metabolism are important, not only for understanding the changes in physiology and biochemistry occurring in the developing neonate, but the principles by which nutritional support should be provided.
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Total Pages | : 1292 |
Release | : 1948 |
Genre | : Medicine |
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Download United States Naval Medical Bulletin Book in PDF, Epub and Kindle
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Total Pages | : 1454 |
Release | : 1990 |
Genre | : Antarctica |
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Download Antarctic Journal of the United States Book in PDF, Epub and Kindle
Author | : Gene E. Likens |
Publisher | : Academic Press |
Total Pages | : 745 |
Release | : 2010-05-20 |
Genre | : Science |
ISBN | : 0123819970 |
Download Biogeochemistry of Inland Waters Book in PDF, Epub and Kindle
A derivative of the Encyclopedia of Inland Waters, Biogeochemistry of Inland Waters examines the transformation, flux and cycling of chemical compounds in aquatic and terrestrial ecosystems, combining aspects of biology, ecology, geology, and chemistry. Because the articles are drawn from an encyclopedia, they are easily accessible to interested members of the public, such as conservationists and environmental decision makers. This derivative text describes biogeochemical cycles of organic and inorganic elements and compounds in freshwater ecosystems
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Total Pages | : 838 |
Release | : 1971 |
Genre | : Chemistry |
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Download Indian Journal of Chemistry Book in PDF, Epub and Kindle