Data/hora: 03/06/2024 03:59:52

Biblioteca(s): | Embrapa Pecuária Sudeste.
Data corrente: | 03/12/2004
Data da última atualização: | 06/05/2022
Autoria: | LEMOS, S. G.; NOGUEIRA, A. R. de A.; TORRE NETO, A.; PARRA, A.; ARTIGAS, J.; ALONSO, J.
Afiliação: | SHERLAN G. LEMOS, UFSCAR; ANA RITA DE ARAUJO NOGUEIRA, CPPSE; ANDRE TORRE NETO, CNPDIA; ALEIX PARRA, Universitat Autònoma de Barcelona; JUDIT ARTIGAS, Universitat Autònoma de Barcelona; JULIAN ALONSO, Universitat Autònoma de Barcelona.
Título: | In-soil potassium sensor system.
Ano de publicação: | 2004
Fonte/Imprenta: | Journal of Food Chemistry, v.52, n.19, p.5810-5815, 2004.
DOI: | https://doi.org/10.1021/jf0492924
Idioma: | Inglês
Conteúdo: | A potentiometric sensor system based on potassium ion-selective electrodes was developed for agricultural purposes. Sensors were built using PVC ion-selective membranes over an inner solid contact prepared with graphite?epoxy composites. A copper plate was used as a reference electrode. A two-stage electronic circuit composed of current and voltage amplifiers was designed to interface the sensors to a distributed data acquisition system. Three ion-selective sensors and three off-the-shelf temperature sensors and their associated circuits were mounted in a PVC tube to set up a soil probe. The electronic controls were placed in an airtight box fixed at the upper part of the probe. The system was evaluated in the field, where the sensors presented sensibility within the range of 69?71 mV dec-1. Extracts of soil samples were analyzed by a current flame photometry approach, and the results, compared with the probe measurements, showed a linear relationship (r?2 = 0.992 and 0.995, respectively, to 5 and 20 cm depths), which implies viability and instrumentation reliability for agricultural applications.
Palavras-Chave: | in situ; Potentiometric sensor; Soil fertiliy.
Thesaurus Nal: | potassium; soil analysis.
Categoria do assunto: | W Química e Física
Registro original: | Embrapa Pecuária Sudeste (CPPSE)
Exemplares: | CPPSE - (15350-1) - UPC - AP - DD - PROCI-2004.00119 - LEM - 2004.00119 - DIS