Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Wetting-drying cycles effects on persistence of a natural mucilage, iron chloride and alum as structuring materials
Year:2008
Research Areas
  • Chemistry,
  • Agriculture
Information
Abstract
Effects of organic and inorganic conditioners on aggregation of suspended particles and alternated wetting-drying cycles influence on persistence of aggregates formed by the conditioners: Cardon Dato mucilage (CD) (Stenocereus griseus (Haw) F. Buxb), iron chloride, aluminum chloride and a commercial poliacrylamide (PAM) were studied. Doses tested were: 50 mg L-1 CD; 3 cmol+ kg-1 Fe+3; 3 cmol+ kg-1 Al+3; 1.5 cmol+ kg-1 Fe+3 + 1.5 cmol+ kg-1 Al+3; 50 mg L-1 CD + 1.5 cmol+ kg-1 Fe+3; 50 mg L-1 CD + 1.5 cmol+ kg-1 Al+3; 50 mg L-1 CD + 1.5 cmol+ kg-1 Fe+3 + 1.5 cmol+ kg-1 Al+3; 10 mg L-1 of PAM; and distilled water as control. An oven dried (60-70°C) Spain kaolin powder was used as substrata. Equal amounts of kaolin powder were suspended in each conditioner and submitted to four cycles of drying and wetting. The comparative effect in the Aggregation index (AgI) for three different sizes of aggregates (< 6 ìm; 6-25 ìm & >25 ìm), among those 10 treatments was analyzed by a completely randomized model with four repetitions. The effect of each wetting-drying cycle for each treatment was also analyzed by a totally Randomized model with four repetitions. The kaolin was 55% clay and 45% silt and kaolinite its main mineral. The AgI of the 50 mg L-1 CD treatment was less persistent than the one of 10 mg L-1 of PAM, and the AgI of them both were less persistent than those of all treatments that included Fe and Al. The smaller AgI persistence of these two organic conditioners could be related to their lower bonding strength among aggregated particles, which reduces their effectiveness in avoiding particles dispersion during wetting. The structuring effect of Al and Fe is more long-lasting than the one induced by the organic conditioners.
International
Si
Congress
EUROSOIL 2008
960
Place
Viena
Reviewers
Si
ISBN/ISSN
978-3-902382-05-4
Start Date
25/08/2008
End Date
29/08/2008
From page
343
To page
343
EUROSOIL2008
Participants
  • Participante: MA Henríquez-Rodríguez (1Universidad Centroccidental Lisandro Alvarado)
  • Autor: Juana Perez Arias (UPM)
  • Autor: Jose Maria Gasco Montes (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Valorización de Recursos
  • Departamento: Edafología
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