A method to exclude nitrate from Kjeldahl digestion of plant tissues
作者:
D.C. Bowman,
J.L. Paul,
R.M. Carlson,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1988)
卷期:
Volume 19,
issue 2
页码: 205-213
ISSN:0010-3624
年代: 1988
DOI:10.1080/00103628809367932
出版商: Taylor & Francis Group
关键词: Nitrogen;Plant analysis
数据来源: Taylor
摘要:
A micro‐Kjeldahl method suitable for use with a commercial block digestor is described which minimizes NO3‐N reduction during digestion and also reduces foaming. One hundred mg plant tissue are pretreated with 3 ml H2O2at 100° C for 15 min. This is followed by addition of concentrated H2SO4, K2SO4, and catalyst, and digestion at 360° C for 1 hr. With H2O2added after the H2SO4, 40% of the NO3‐N was reduced over a range in the tissue from 0.25% to 1.5% NO3‐N. With the H2O2pretreatment essentially none of the NO3‐N was reduced. Total nitrogen, (reduced N determined by the proposed method plus nitrate, measured separately) was analyzed for 9 species ranging in NO3‐N from 0 to 0.73% and in total N from 1.4 to 4.4%. The results agree well with the AOAC method 2.052 (1).
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