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This article in SSSAJ

  1. Vol. 52 No. 5, p. 1483-1486
     
    Received: Jan 4, 1988


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doi:10.2136/sssaj1988.03615995005200050052x

Improved Apparatus for Preparing Nitrogen-15 Labeled Anhydrous Ammonia

  1. R. M. Vanden Heuvel 
  1. Dep. of Agronomy, 1102 S. Goodwin Ave., Univ. of Illinois, Urbana, IL 61801

Abstract

Abstract

An all-stainless steel apparatus is described that allows for dilution of highly 15N-enriched liquid anhydrous ammonia (LAA) with natural abundance LAA to accurately and precisely produce up to 142 mL of LAA for 15N-enrichments up to that being used for dilution. Such flexibility of 15N-labeling is useful for studies where 15N-enrichment requirements are diverse. The apparatus, calibrated for various volume-pressure combinations of anhydrous ammonia gas at room temperature, allows for sequential recovery of selected amounts of 15N-enriched and natural abundance LAA in a liquid N2 cold trap. The apparatus is constructed from commercially available components and the cylinders used for collecting the 15N-labeled LAA are easily adaptable for use in laboratory and field N investigations.

This study was a part of Project no. ILLU-15-0368 of the Agric. Exp. Stn., College of Agriculture, Univ. of Illinois, Urbana-Champaign. It was supported in part by the Tennessee Valley Authority.

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