Abstract: In a simulation experiment with saline soil column, this paper studied the effects of acid rain (pH=5.0 and 2.9) on the mobility and form transformation of Zn, Cu and Ni in amended sludge compost. The leachate was collected every other day over 42-day experiment, and the heavy metals in soil were fractionated by using sequential extraction method. The results showed that under the same acid rain intensity, the heavy metals content in leachate and their migration in soil followed the sequence of Zn>Cu>Ni, and the heavy metals content in the same soil depths was in the order of Zn> Ni > Cu. The decrease of acid rain pH and the increase of sludge compost dosage increased the heavy metals content in leachate and soil, but had no effect on their migration. Soil acidification promoted the transformation of heavy metals to activated forms and their migration to deeper soil.

Key words: Sediment, Nutrient, East China Sea, Regeneration