So according to the passivation effect on available forms of heavy metals, fly ash, phosphorate rock and peat are effective passivation reagents, and the appropriate proportion of addition is respectively 20%,15% and 10% (FA20, PR15, PT10).

• 所以从对有效态重金属的钝化效果来说，粉煤灰、磷矿粉、草炭应该是3种有效的重金属钝化剂，其合适的添加比例分别为20%25、15%25和10%25(FA20、PR15、PT10)；