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DISCUSSION BY ATTENDEES 



Reiners: Data from two unpublished studies on the effects of acid rain on 

 soils may be of interest. Drs. Dominski and Bormann of Yale University, and Dr. 

 Reynolds of Dartmouth College have treated New Hampshire soils with solutions 

 of increasing SO4 — acidity. In general, leaching produced little metallic cation 

 release until pH was reduced to 3.0, at which point cation release was sizable. 

 These results suggest that soils under an acid regime have already conditioned 

 their cation exchange behavior to the current leachate, and they may have been 

 undergoing that influence for some time. 



On another point, we have been measuring the pH of snow and hoarfrost at 

 1350 m elevation in New Hampshire through the winter of 1971 — 1972. The 

 median pH was about 3.4. 



