The main reason is that the effectiveness of limestone is short-lived. The metal sulfide adsorbed on the carbonate is easily desorbed after long-term weathering and leaching, and is re-oxidized to produce acid (Evangelou, 1995);
The main reason is that the effectiveness of limestone is short-lived, the metal sulphides adsorbed on carbonates are easily disinsorbed after long-term weathering and easily disinfed, and are re-oxidized to produce acids (Evangelou, 1995);
The main reason is that the effectiveness of limestone is short-term, and the metal sulfide adsorbed on carbonate is easy to desorb after long-term weathering and leaching, and is oxidized to produce acid again (Evangelou, 1995);<br>