Abstract
AbstractAn 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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