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Table 3

Contents of Hg and As in surface sediment of Wuliangsuhai Lake

Season
Soil background value of Hetao Irrigation District/(mg/kg)
SummerAutumnWinterSpring
Hg 
 Range (mg/kg) 0.013–0.196 0.02–0.133 0.019–0.063 0.014–0.135 0.02485 
 Mean (mg/kg) 0.11 0.055 0.036 0.057 
 SD 0.031 0.035 0.015 0.045 
As 
 Range (mg/kg) 2.25–15.18 3.53–14.26 5.20–9.62 5.77–13.95 9.68 
 Mean (mg/kg) 8.10 7.52 7.39 9.67 
 SD 2.13 2.00 2.41 3.12 
Season
Soil background value of Hetao Irrigation District/(mg/kg)
SummerAutumnWinterSpring
Hg 
 Range (mg/kg) 0.013–0.196 0.02–0.133 0.019–0.063 0.014–0.135 0.02485 
 Mean (mg/kg) 0.11 0.055 0.036 0.057 
 SD 0.031 0.035 0.015 0.045 
As 
 Range (mg/kg) 2.25–15.18 3.53–14.26 5.20–9.62 5.77–13.95 9.68 
 Mean (mg/kg) 8.10 7.52 7.39 9.67 
 SD 2.13 2.00 2.41 3.12 
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