中文关键词
水库淹没带有机氯农药(OCPs)六六六(HCHs)滴滴涕(DDTs)分布特征土壤生态风险 | 英文关键词submerged area around reservoirorganochlorine pesticides (OCPs)hexachlorocyclohexanes (HCHs)dichlorodiphenyltrichloroethanes (DDTs)distribution characteristicsecological risk of soil |
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| 中文摘要 |
| 采用GC-MS气相色谱与质谱联用仪，分析了密云水库南水北调来水前高程130~150 m之间的淹没带表层土壤样品中17种有机氯农药（OCPs）的含量、残留特征，讨论了有机氯农药的可能来源，并对OCPs的潜在风险进行了评价.结果表明：①密云水库淹没带土壤有机氯农药残留以六六六（HCHs）和滴滴涕（DDTs）为主，含量均值分别为1.74 ng·g-1和1.01 ng·g-1，与国内其他湖库区相比，ΣHCHs含量相近，ΣDDTs含量较低.②水库淹没带土壤有机氯农药残留具有一定的空间分布特征.水陆域交错处土壤OCPs含量普遍高于水域、陆域土壤中含量，且存在显著性差异性.水库东部及潮河入库区、独立小流域淹没区，OCPs残留以DDTs为主；库北山前平原淹没带及库西中部淹没区OCPs则以γ-HCH残留为主；白河入库处河滩淹没区HCHs及DDTs残留均有较高占比，这与其污染来源有关.③源解析结果表明，淹没带土壤HCHs来源主要与林丹类农药的输入有关，而DDTs主要来自于早期农药使用的残留.④生态风险评价表明，水库淹没带土壤中大部分样点OCPs生态风险低，白河入库区及库西中部淹没带滴滴涕有潜在风险性. |
| 英文摘要 |
| Soil samples collected from a submerged area around Miyun Reservoir were analyzed for organochlorine pesticide (OCP) residues using GC-MS. The distribution characteristics and possible sources of OCPs were studied, as well as the potential ecological risk. The results showed the following:① the residuals of OCPs in the surface soil were mainly hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs), and the average contents of HCHs and DDTs were 1.74 ng·g-1 and 1.01 ng·g-1, respectively. In comparison with other lakes and reservoirs in China, the mean value of DDT content of the soil samples from Miyun Reservoir was slightly less, whereas the mean value of HCH content was similar to other waterbodies. ② There was a distinct spatial distribution of OCPs in soils of the submerged area. Specifically, the OCP content in the water-land interlaced soil was generally higher, with distinct differences to the water or in land. In the eastern region of the reservoir and in the Chaohe River inflow area, the residues of OCPs were mainly DDTs, as was the case for the submerged soils of small isolated watersheds. The OCPs in the submerged area of the northern reservoir and the western central reservoir were mainly γ-HCH residues, while HCH and DDT residues were found in high proportions in the flooded area where the Baihe River inflows. These patterns were related to sources of pollutants; ③ the source analysis showed that sources of HCHs could be related to lindane input, while DDTs mainly derived from the early residues in the environment; ④ there was low ecological risk from OCPs in most of the samples, and a potential risk from DDT in the Baihe inflow area and in the central submerged zone of the western reservoir. |
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