Advances in Civil Engineering / 2018 / Article / Tab 4

Research Article

Utilization of Electroplating Sludge as Subgrade Backfill Materials: Mechanical and Environmental Risk Evaluation

Table 4

Standard values of soil environmental quality (mg/L).

Heavy metalsGrade IaGrade IIGrade IIIc
NaturalpH < 6.5pH 6.5–7.5pH > 7.5pH > 6.5

Cu (farmland)3550100100400
Cu (orchard)150200200400

aLimit values for protecting natural ecology and maintaining the soil quality in the natural setting. bLimit values for protecting agricultural productions and human health. cLimit values for protecting the normal growth of plants.

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