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Journal of Chemistry
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2016
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Article
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Tab 2
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Research Article
Fractional Characteristics of Heavy Metals Pb, Zn, Cu, and Cd in Sewer Sediment from Areas in Central Beijing, China
Table 2
Pollution grades of potential ecological risk of heavy metals.
Risk assessment code
Criteria (%)
No risk
<1
Low risk
1–10
Medium risk
11–30
High risk
31–50
Very high risk
>50