Improved diffusion methods for nitrogen and 15nitrogen analysis of Kjeldahl digests.

Improved diffusion methods for nitrogen and 15nitrogen analysis of Kjeldahl digests. Research Abstract Details 

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Improved diffusion methods for nitrogen and 15nitrogen analysis of Kjeldahl digests. Abstract Text:

Simple methods are described that permit the use of either H3BO3 indicator solution or acidified filter disks to collect NH3 liberated by treatment of Kjeldahl digests with NaOH. These methods incorporate modifications to improve reliability, analytical capacity, and convenience. A semimicro digest was diluted to 25 mL with deionized water, and a 10 mL aliquot, containing up to 4 mg N (150 microg N for diffusions into acidified disks), was transferred to a shell vial, which was placed inside a 473 mL (1 pint) Mason jar containing 10 mL 10N NaOH. The NH3 liberated by overturning the vial was collected after 12 to 48 h at ambient temperature, or after 4 h at 45 to 50 degrees C on a hotplate, for quantitative and/or isotope-ratio analyses. With either H3BO3 indicator solution or acidified filter disks, recovery of diffused N was quantitative. Isotope-ratio analyses of diffused N from 15N-labeled chemical, plant, and soil samples were within 3% of analyses using steam distillation.

Improved diffusion methods for nitrogen and 15nitrogen analysis of Kjeldahl digests. Publishing Authors By Initials

For similar inorganic chemicals: isotopes: nitrogen isotopes research abstracts see: inorganic chemicals: isotopes: nitrogen isotopes research

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Improved diffusion methods for nitrogen and 15nitrogen analysis of Kjeldahl digests. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of AOAC International

VOLUME: 83

Page Numbers: 1039-46

Journal Abbreviation: J AOAC Int

ISSN: 1060-3271

DAY: 17

MONTH: 03

YEAR: 2008

Improved diffusion methods for nitrogen and 15nitrogen analysis of Kjeldahl digests. Information

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LANGUAGE: eng

NlmUniqueID: 9215446

Improved diffusion methods for nitrogen and 15nitrogen analysis of Kjeldahl digests. Keywords Mesh Terms:

KEYWORDS: Nitrogen Isotopes

MESH TERMS: analysis

Chemical & Substance for Abstract: Improved diffusion methods for nitrogen and 15nitrogen analysis of Kjeldahl digests. Information

Substance Name: Nitrogen

Registry Number: 7727-37-9

Grant and Affiliation Information for Improved diffusion methods for nitrogen and 15nitrogen analysis of Kjeldahl digests.

AFFILIATION: University of Illinois, Department of Crop Sciences, Urbana 61801, USA.

Country: UNITED STATES

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MEDLINETA: J AOAC Int

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