Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/98138
Type: Artigo de periódico
Title: Flow-injection Determination Of Ammonia In Kjeldahl Digests By Gas Diffusion And Conductometry
Author: Pasquini C.
de Faria L.C.
Abstract: A flow injection/conductometric method is proposed for determing ammonia in solutions obtained from Kjeldahl digestion. The method is based on diffusion of ammonia through a PTFE membrane from an alkaline (NaOH/EDTA) medium to a deionized water stream. The change in conductance of the deionized water stream is proportional to the ammonia concentration present in the digest. The effects of flow parameters, temperature and potential interferences are reported. Approximately 100 samples can be injected per hour; the precision is about 1%. Results for total nitrogen in vegetable tissues, animal feeds and fertilizers are in good agreement with those obtained by the usual distillation/titration method. © 1987.
Editor: 
Rights: fechado
Identifier DOI: 10.1016/S0003-2670(00)86134-6
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0002343075&partnerID=40&md5=0c8481bebdbc7260f5f77259ea1b8154
Date Issue: 1987
Appears in Collections:Unicamp - Artigos e Outros Documentos

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