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The Effect of Hydroxy‐Al and Hydroxy‐Fe Polymers on Montmorillonite Particle Size
Author(s) -
Frenkel H.,
Shainberg I.
Publication year - 1980
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1980.03615995004400030039x
Subject(s) - montmorillonite , polymer , potentiometric titration , dispersion (optics) , titration , suspension (topology) , particle size , particle (ecology) , adsorption , chemistry , neutralization , chemical engineering , polymer chemistry , nuclear chemistry , materials science , inorganic chemistry , organic chemistry , geology , ion , physics , oceanography , mathematics , antibody , engineering , homotopy , pure mathematics , optics , immunology , biology
Potentiometric and photometric titration of Al‐ and Fe‐montmorillonite suspensions with NaOH and Na 2 B 4 O 7 are presented. Hydroxy‐Al polymers formed during the neutralization reaction apparently acted as cementing agents and prevented the dispersion of the structure. When an excess of NaOH is added, the hydroxy‐Al polymers disintegrate and complete dispersion of the Na‐montmorillonite takes place. No aluminates are formed upon neutralization of Al‐montmorillonites with Na 3 B 4 O 7 , and hence no dispersion takes place. Neutralization of Fe‐montmorillonite suspension with NaOH and Na 2 B 4 O 7 resulted in gradual breakdown of the Fe‐montmorillonite particles. Hydroxy‐Fe polymers were not as effective in preventing the dispersion of the particles by adsorbed Na as hydroxy‐Al polymers.