Sôbre a determinação do nitrogênio, do fósforo e do potássio no mesmo extrato

Sôbre a determinação do nitrogênio, do fósforo e do potássio no mesmo extrato

The determination of total nitrogen, phosphorus, and potassium in plant material can be carried out in a common extract prepared with sulphuric acid and 30 per cent hydrogen peroxide. Nitrogen is estimated by direct nesslerization of a suitable aliquot (1-5 ml of the 50 ml extract made out of 250 mg of dried material); in order to avoid excessive acidity, 10 ml of Nessler's reagent should be employed. An aliquot of 1-5 ml suffices for the colorimetric determination of phosphorus by the molybdenum method; to reduce the phosphomolybdate complex 2 ml of a 2% SnC12 soln are necessary. Potassium is determined by the cobaltinitrite method after elimination of ammonium salts with the aid of aqua-regia.

Saved in:
Bibliographic Details
Main Authors: Malavolta,E., Arzolla,J. P., Haag,H. P.
Format: Digital revista
Language:Portuguese
Published: Universidade de São Paulo 1958
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761958000100002
Tags: Add Tag
No Tags, Be the first to tag this record!
id oai:scielo:S0071-12761958000100002
record_format ojs
spelling oai:scielo:S0071-127619580001000022012-09-25Sôbre a determinação do nitrogênio, do fósforo e do potássio no mesmo extratoMalavolta,E.Arzolla,J. P.Haag,H. P.The determination of total nitrogen, phosphorus, and potassium in plant material can be carried out in a common extract prepared with sulphuric acid and 30 per cent hydrogen peroxide. Nitrogen is estimated by direct nesslerization of a suitable aliquot (1-5 ml of the 50 ml extract made out of 250 mg of dried material); in order to avoid excessive acidity, 10 ml of Nessler's reagent should be employed. An aliquot of 1-5 ml suffices for the colorimetric determination of phosphorus by the molybdenum method; to reduce the phosphomolybdate complex 2 ml of a 2% SnC12 soln are necessary. Potassium is determined by the cobaltinitrite method after elimination of ammonium salts with the aid of aqua-regia.info:eu-repo/semantics/openAccessUniversidade de São PauloEscola Superior de AgriculturaAnais da Escola Superior de Agricultura Luiz de Queiroz v.14-15 19581958-01-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761958000100002pt10.1590/S0071-12761958000100002
institution SCIELO
collection OJS
country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-scielo-br
tag revista
region America del Sur
libraryname SciELO
language Portuguese
format Digital
author Malavolta,E.
Arzolla,J. P.
Haag,H. P.
spellingShingle Malavolta,E.
Arzolla,J. P.
Haag,H. P.
Sôbre a determinação do nitrogênio, do fósforo e do potássio no mesmo extrato
author_facet Malavolta,E.
Arzolla,J. P.
Haag,H. P.
author_sort Malavolta,E.
title Sôbre a determinação do nitrogênio, do fósforo e do potássio no mesmo extrato
title_short Sôbre a determinação do nitrogênio, do fósforo e do potássio no mesmo extrato
title_full Sôbre a determinação do nitrogênio, do fósforo e do potássio no mesmo extrato
title_fullStr Sôbre a determinação do nitrogênio, do fósforo e do potássio no mesmo extrato
title_full_unstemmed Sôbre a determinação do nitrogênio, do fósforo e do potássio no mesmo extrato
title_sort sôbre a determinação do nitrogênio, do fósforo e do potássio no mesmo extrato
description The determination of total nitrogen, phosphorus, and potassium in plant material can be carried out in a common extract prepared with sulphuric acid and 30 per cent hydrogen peroxide. Nitrogen is estimated by direct nesslerization of a suitable aliquot (1-5 ml of the 50 ml extract made out of 250 mg of dried material); in order to avoid excessive acidity, 10 ml of Nessler's reagent should be employed. An aliquot of 1-5 ml suffices for the colorimetric determination of phosphorus by the molybdenum method; to reduce the phosphomolybdate complex 2 ml of a 2% SnC12 soln are necessary. Potassium is determined by the cobaltinitrite method after elimination of ammonium salts with the aid of aqua-regia.
publisher Universidade de São Paulo
publishDate 1958
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761958000100002
work_keys_str_mv AT malavoltae sobreadeterminacaodonitrogeniodofosforoedopotassionomesmoextrato
AT arzollajp sobreadeterminacaodonitrogeniodofosforoedopotassionomesmoextrato
AT haaghp sobreadeterminacaodonitrogeniodofosforoedopotassionomesmoextrato
_version_ 1756382366650073088

Similar Items