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《Acta Mineralogica Sinica》 1994-01
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DETERMINATION OF LAYER CHARGE AND CHARGE DISTRIBUTION OF SMECTITE LAYERS IN RECTORITE BY ALKYLAMMONIUM METHOD

Zhang Rongying(Hubei Institute of Geological Experiments, Wuhan, 430022)  
The layer charge (ξ) and charge distribution of smectite layers in rectorite have been determined on the basis of the relationship between basal spacings (d) of a series of alkylammonium intercalated rectorite and a number of carbon atoms in the alkyl - - -chain (NC). The mean layercharge of smectite layers in rectorite has been calculated by a regression equation derived from therelationship between basal spacings (d) of alkylammonium (NC = 12) rectorite vs. mean layercharge (ξ). The tetrehedral charge has been determined on rectorite sample after the GreeneKelly test (Li - - -saturated and heat - treated at 250℃ ). The octahedral charge can be estimated by the difference method.Except sample No. 7, the mean layer charge calculated from ten rectorite samples is 0. 33~0.381 eq / (AlSi)4O10. The proportion of octahedral charge is estimated to account for about 1/5~ 1/3 of the total layer charge. The charge distribution can be divided into two types: homogeneous andheteroge neous.
【CateGory Index】: P575.1
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