Improved Apparatus for Preparing Nitrogen-15 Labeled Anhydrous Ammonia
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.
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