| .扎龙湿地表层沉积物有机氯农药的污染特征及风险评价[J].农业环境科学学报,2013,32(2):. |
| 扎龙湿地表层沉积物有机氯农药的污染特征及风险评价 |
| Comtamination Characteristics and Risk Evaluation of Organochlorine Pesiticide in Surface Sediments from Zhalong Wetland， China |
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| DOI：10.11654/jaes.2013.02.020 |
| 中文关键词: 有机氯农药 沉积物 污染源 总有机碳 生态风险 扎龙湿地 |
| 英文关键词: organochlorine pesticides（OCPs） sediment pollution sources total organic carbon ecological risk Zhalong wetland |
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| 摘要点击次数: 2329 |
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| 中文摘要: |
| 利用GC-ECD定量测定了扎龙湿地12个表层沉积物样品中17种有机氯农药的含量，并对其污染水平、组成及来源进行了分析。结果表明，所有样品中有机氯农药总量在0.41~19.32 ng·g-1之间（均值为4.82 ng·g-1，干重），其中以滴滴涕（DDTs）和六六六（HCHs）为主，另外氯丹在所有样品中均被检出。与国内外其他的湖泊表层沉积物相比，扎龙湿地的有机氯农药污染处于较低水平。有机氯农药的组成特征分析表明DDT和HCH主要来自环境中的早期残留，氯丹的主要来源为大气沉降。相关性分析表明，沉积物中总有机碳含量是影响有机氯农药含量和分布的重要因素。生态风险评估显示沉积物中有机氯农药存在一定的生态风险，可能会对水生底栖生物造成潜在的危害。 |
| 英文摘要: |
| Zhalong Wetland is one of the most important ecological regions located in the northern part of China. Organochlorine pesticides（OCPs） have been detected in sediments from different regions in China, but little is known about Zhalong Wetland. This study investigated OCPs concentrations and risk levels in the surface sediments from Zhalong wetland. Seven-teen OCPs of 12 samples were determined by gas chromatography with electron capture detector（GC-ECD）, and the distribution patterns and sources of OCPs were analyzed. The total concentrations of 17 OCPs ranged from 0.41 ng·g-1 to 19.32 ng·g-1（with a mean value of 4.82 ng·g-1 based on dry weight）. Compared with the surface sediments of other lakes both in China and other countries, the levels of OCPs in Zhalong were lower. OCPs were dominated by DDTs and HCHs, while chlordane were detected in all surface sediment samples. The analysis of OCPs compositions indicated that DDT and HCH mainly came from the early residues in the environment, and chlordane mainly originated from atmospheric deposition. Correlations between OCPs and total organic carbon（TOC） demonstrated that TOC content strongly influenced the levels and distributions of OCPs. Meanwhile, the results of ecological risk evaluation showed that OCPs in sediments from Zhalong wetland had a certain ecological risk, which would have potential toxic effects on sediment-dwelling organisms. |
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