A Semiautomated Procedure for Total Nitrogen in Plant and Soil Samples1
- R. N. Gallaher,
- C. O. Weldon and
- F. C. Boswell2
This study evaluated inexpensive alternatives for the determination of total N in plant and soil samples. Plant and soil samples which varied widely in N concentration were digested in a 126-sample-capacity Al block digester followed by determination of total N with the ammonium electrode in a semiautomated reaction vessel assembly. The proposed Ammonium electrode semiautomated (AES) procedure was compared to standard micro-Kjeldahl and aluminum block digested-steam distilled-titrated (ABDDT) procedures. Thirty to 50 more samples could be analyzed per 8-hour day with the proposed semiautomated procedure as compared to standard micro-Kjeldahl methods. The precision of the methods were comparable but significantly more N was found by using the ABDDT procedure.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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