Research Article
HCHs and DDTs in Soils around Guanting Reservoir in Beijing, China: Spatial-Temporal Variation and Countermeasures
Table 1
Concentrations (ng/g dw) of OCPs in soil samples in 2003, 2007, and 2009.
| | Variables | | Mean ± SD (min–max) | | | 2003 | 2007 | 2009 |
| | HCHs group | -HCH | 0.06 ± 0.14 (nd−0.78) | 0.02 ± 0.05 (nd−0.27) | 0.03 ± 0.08 (nd−0.48) | | -HCH | 0.36 ± 0.68 (nd−2.74) | 0.59 ± 0.94 (nd−4.58) | 0.69 ± 1.83 (nd−14.34) | | -HCH | 0.06 ± 0.20 (nd−1.41) | 0.16 ± 0.19 (nd−1.01) | 0.01 ± 0.03 (nd−0.15) | | -HCH | 0.19 ± 0.61 (nd−3.55) | 0.07 ± 0.22 (nd−1.53) | 0.02 ± 0.06 (nd−0.30) | | 0.66 ± 1.34 (nd−7.33) | 0.85 ± 1.18 (nd−5.56) | 0.73 ± 1.92 (nd−14.97) | | DDTs group | p,p’-DDE | 4.71 ± 9.42 (nd−52.20) | 3.88 ± 10.69 (nd−78.07) | 5.07 ± 11.59 (nd−55.96) | | p,p’-DDD | 0.24 ± 0.61 (nd−3.37) | 0.11 ± 0.33 (nd−1.76) | 0.73 ± 1.70 (nd−9.71) | | o,p’-DDT | 0.84 ± 2.30 (nd−11.71) | 0.75 ± 1.81 (nd−9.04) | 0.08 ± 0.47 (nd−3.55) | | p,p’-DDT | 3.67 ± 7.75 (nd−33.08) | 2.98 ± 7.38 (nd−50.73) | 0.58 ± 1.30 (nd−7.34) | | 9.46 ± 17.76 (nd−76.01) | 7.84 ± 17.68 (nd−116.74) | 6.46 ± 13.28 (nd−64.91) | | Reference | | [16] | [19] | Present study |
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*nd: the value less than LOD (limits of detection) was set to nd.
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