For the effective utilization of rain water, the common ion mobility applicable for the rain over Japan must be determined.
Thus, a simple, reliable method which can estimate precisely the total dissolved ion content in rain must be developed.
In the present study, 61 rain samples were collected according to the standard methods of sampling and measurement.
Among these samples, 29 were obtained by the first Japanese government acid rain survey. The effects of dissolved ions on electric conductivity and on the common ion mobility were studied using these samples. And total dissolved ion content was estimated.
Results of this investigation are summarized as follows:
(1) H
+ concentration strongly influences on the electric conductivity of rain. This influence can be eliminated by standardizing the pH of rain to pH=5.7.
(2) Common ion mobility was found to be 6.2×10
-4cm
2/V⋅s.
(3) Total dissolved ion content can be easily estimated accurately to facilitate the use of the rain water adequately according to the salt concentration estimated with the proposed method.
(4) This method can also determine the concentration of each ion based on the proportionality of its contribution to the overall pH and electric conductivity.
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