Figure 2: Mercury concentrations in soil samples collected near the power plants.
From: Mercury pollution in vegetables, grains and soils from areas surrounding coal-fired power plants
Dashed line: background soil mercury concentration in China (37 μg/kg)32. Sampling sites are marked in Fig. 1. Uncontaminated soil samples were collected from a farmland site >55 km away from any power plants. A1, A2, B1, B2, B3 and B4 are locations where biological samples were collected. The level of significance was defined at P < 0.05 using T-test.
