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Title: | Layer charge of two shrink-swell soil clays by alkylammonium method |
Other Titles: | Not Available |
Authors: | Ray, S.K., Chandran, P., Pal, D.K. and Durge, S.L. |
ICAR Data Use Licennce: | http://krishi.icar.gov.in/PDF/ICAR_Data_Use_Licence.pdf |
Author's Affiliated institute: | ICAR::National Bureau of Soil Survey and Land Use Planning |
Published/ Complete Date: | 2003-11-04 |
Project Code: | Not Available |
Keywords: | Layer charge, shrink-swell, soil, clays, alkylammonium method |
Publisher: | Not Available |
Citation: | Ray, S.K., Chandran, P., Pal, D.K. and Durge, S.L. (2003). Layer charge of two shrink-swell soil clays by alkylammonium method. Commission 2.4: Soil Mineralogy ISSS National Seminar and 68th Annual Convention, November 4-8, 2003 Kanpur, Uttar Pradesh (Abstract), pp. 67-68. |
Series/Report no.: | Not Available; |
Abstract/Description: | Shrink-swell behaviour, clay CEC and adsorption and/or fixation of K+ ions are fundamental to the layer charge characteristics of shrink- swell soils. In order to establish these relationships, the present study was carried out to find out the layer charge characteristics of two Vertisol clays belonging to Kharwadi and Sait soils from Amravati district of Maharashtra. The soils were analysed for physical, chemical and mineralogical properties. Fine clays of a slickensided horizon from each soil were treated with various alkylammonium chlorides having carbon atoms 4 to 18. The plots of d-values against chain lengths of alkylammonium ions show a monolayer (1.34-1.42) to bilayer (1.75-1.81) transition curve for standard bentonite clay. The mean value of layer charge for bentonite was estimated to be 0.31 mol(-)/ (Si,Al)4O10(OH)2 (Lagaly and Weiss, 1981; Malla and Douglas 1987). The relationship between d-values and number of carbon atoms for soil clays show S-type curves with a bilayer–pseudotrimolecular layer transition. The plot of Sait clays resemble that of typical low charge vermiculites (Lagaly, 1982) whereas that of Kharwadi indicated a simple S-type curve. The mean layer charge of Sait soil clays is 0.54 mol(-) / (Si,Al)4O10(OH)2 and that in Kharwadi soil clays is 0.49 mol(-) / (Si,Al)4O10(OH)2. The COLE values are lower in Sait soils having higher layer charge (Table 1). Clay CEC values are lower in Sait soils due to hydroxy-interlayering of smectites (Ray et al.,2002) and which have higher layer charge values as these resemble low charge vermiculites as stated above. This is also confirmed by the presence of small amounts hydroxy-interlayered smectites as shown by XRD data. The study shows that the swell-shrink properties (COLE values) and clay CEC are reflected in layer charge characteristics of soils. |
Description: | Not Available |
ISSN: | Not Available |
Type(s) of content: | Presentation |
Sponsors: | Not Available |
Language: | English |
Name of Journal: | Not Available |
Volume No.: | Not Available |
Page Number: | Not Available |
Name of the Division/Regional Station: | Nagpur |
Source, DOI or any other URL: | Not Available |
URI: | http://krishi.icar.gov.in/jspui/handle/123456789/43664 |
Appears in Collections: | NRM-NBSSLUP-Publication |
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