Critical coagulation concentrations of sodium and potassium illite as affected by pH

Journal Article · · Soil Science Society of America Journal; (United States)

DOI:https://doi.org/10.2136/sssaj1990.03615995005400030018x· OSTI ID:5400154

Hesterberg, D ^[1]; Page, A L ^[2]

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1. Chevron Oil Field Research Co., La Habra, CA (USA)
2. Univ. of California, Riverside (USA)

The effects of saturating cation (Na or K) and pH on the critical coagulation concentrations (CCCs) of illite were measured. Flocculation series tests showed that between pH 6 and 11, the time-in-variant CCCs of Na illite increased from 6 to 58 mol Na m{sup {minus}3}; release of interlayer K was controlled by adding 0.1 mol K m{sup {minus}3} to Na-illite suspensions. The CCCs of K illite increased from 3 to 14 mol K m{sup {minus}3} over the pH range 6 to 10. The lower CCCs of K illite relative to Na illite were consistent with a higher surface affinity for K. Increasing CCC with increasing pH was explained by charge alterations on the edge surfaces due to surface-specific proton interactions. A comparison of the authors Na-illite CCCs to published Na-kaolinite and Na-montmorillonite CCCs revealed a greater pH dependence for Na-illite and Na-kaolinite CCCs.

• OSTI ID: 5400154
• Journal Information: Soil Science Society of America Journal; (United States), Journal Name: Soil Science Society of America Journal; (United States) Vol. 54:3; ISSN SSSJD; ISSN 0361-5995
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540210* -- Environment
Terrestrial-- Basic Studies-- (1990-)
ALKALI METALS
CATIONS
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
CHLORATES
CHLORINE COMPOUNDS
CLAYS
ELEMENTS
FLOCCULATION
HALOGEN COMPOUNDS
ILLITE
INTERACTIONS
IONS
KINETICS
METALS
OXYGEN COMPOUNDS
PARTICLE INTERACTIONS
PH VALUE
POTASSIUM
PRECIPITATION
REACTION KINETICS
SEPARATION PROCESSES
SODIUM
TESTING
TIME DEPENDENCE