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For untreated sample, the final pH is gradually reduced at first five times exposure to 1000 mL acid rain, and then, the final pH is gradually constant.

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xfgzju: ½ð±Ò+15, ·­ÒëEPI+1 2015-05-28 16:29:22
When a piece of untreated limestone was exposed to 1L acid rain (for how long?) for 5 times, the final pH gradually decreased initially, then with time, it approached a constant pH. (ÓÃÁËÕâ¸öthen with time ±ÜÃâÌ«¶àgradually)
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