A simple computer model based on chemical equilibrium calculation for evaluating the aluminum speciation in surface waters of low ionic strength (I 1 #xD7; 10#x2212;4M) was presented in this paper. The speciations of aluminum obtained by this model have been compared with those obtained experimentally and the reasons for the observed differences have been discussed. This model has been applied to the estimation of aluminum speciation in practical surface waters sampling from areas of the United Kingdom, United States and People's Republic of China. Some valuable conclusions are obtained.
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