Laboratory experiments indicate that, from dilute solutions (0-50 ppm), peat rapidly (20 minutes) adsorbs about 98 percent of the copper, lignite about 66 percent, and coal about 7 percent. 'Maximum copper contents attained by peat, lignite, and bituminous coal were 1, 0.6, and 0.005 percent, respectively.' Adsorption is most efficient at plt values between 3 and 8. Organic matter from which humic acid is removed adsorbs more copper than organic matter containing humic acid. The amounts of metal adsorbed increases with surface area and ionic potential of the catron. As much as 2.2 percent copper in peat or lignite can be explained by adsorption from natural percolating waters.

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