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2012
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Tab 2
Research Article
HCHs and DDTs in Soils around Guanting Reservoir in Beijing, China: Spatial-Temporal Variation and Countermeasures
Table 2
Composition of HCH and DDT in soil samples in 2003, 2007, and 2009.
Ratio
Year
Average
Minimum
Maximum
Percentage of sites with a ratio less than 1
-HCH/
γ
-HCH
2003
1.35
0.25
3.35
8.9%
2007
0.42
0.12
0.73
15.0%
2009
2.76
2.25
3.26
0
(DDE + DDD)/p,
-DDT
2003
2.52
0.24
25.2
23.2%
2007
1.25
0.09
4.22
41.7%
2009
7.07
0.24
40.1
8.2%