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A Portable Injector for Dispensing Liquid Anhydrous NH3 in the Field
Author(s) -
Smiley R. W.,
Papendick R. I.
Publication year - 1968
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1968.03615995003200050039x
Subject(s) - anhydrous , injector , calibration , analytical chemistry (journal) , chemistry , calibration curve , chromatography , materials science , detection limit , thermodynamics , organic chemistry , mathematics , physics , statistics
A portable injector for metering and dispensing small aliquots of anhydrous NH 3 rapidly and with good precision in the field has been constructed and tested. The device is versatile and should be equally suitable for dispensing other high‐pressure solutions in the field. The portable injector is simple in design, easily operated, and readily transportable. Injecting liquid NH 3 with the portable injector produces little soil disturbance compared with usual application methods. The absolute mass of a single injection of anhydrous NH 3 in the field may be determined by direct calibration in the field or by a laboratory calibration and a calculated correction for temperature. The latter method appears to be more practical and involves no more error than that involved in a direct field calibration. A procedure for sampling soil by taking successive hemispheres around the injection point was found to be satisfactory for characterizing NH 3 concentrations and pH in the retention zone.