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Details van artikel 8 van 164 gevonden artikelen
| Titel: |
A method to exclude nitrate from Kjeldahl digestion of plant tissues |
| Auteur: |
Bowman, D. C. Paul, J. L. Carlson, R. M. |
| Verschenen in: |
Communications in soil science and plant analysis |
| Paginering: | Jaargang 19 (1988) nr. 2 pagina's 205-213 |
| Jaar: |
1988-02 |
| Inhoud: |
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 H2O2 at 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 H2O2 added 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 H2O2 pretreatment 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). |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 8 van 164 gevonden artikelen
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