Table 1 Background and reference values of heavy metals in the soils of the study area.

From: Heavy metals impact environmental capacity of oasis soils in Qinghai-Tibet Plateau dry zone

Element

Background Value(mg/kg)

Reference Value(mg/kg)

As

12.5

30

Cd

0.16

0.3

Cu

24.3

100

Hg

0.022

2.4

Pb

22.3

120

Zn

66.8

250

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