概括
这项研究追踪了土壤中持续存在的有机杀虫剂,长达17年. 结果显示,仍然存在大量残留物,这表明土壤长期污染的可能性很高.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 生态毒理学 生态毒理学
背景情况:
- 在历史上,有机化农药被广泛使用.
- 了解它们在土壤中的长期持久性对于环境风险评估至关重要.
- 影响农药在土壤中的降解因素需要进一步调查.
研究的目的:
- 为了确定几个有机杀虫剂在土壤中的长期持久性.
- 在最低降解条件下提供有关杀虫剂持久性上限的数据.
主要方法:
- 对特定有机杀虫剂 (阿尔德林,克洛丹,恩德林,赫普塔克隆,迪兰,伊索德林,BHC,托克萨芬,迪尔德林,DDT) 的残留度进行土壤样本分析.
- 土壤处理能够尽量减少退化途径,如浸出,挥发,光分解,机械去除和生物分解.
- 样品在长时间 (14,15,17年) 后进行分析.
主要成果:
- 14年后,技术杀虫剂的剩余百分比在10% (BHC) 到45% (托克萨芬) 之间.
- 纯化阿尔德林和技术性迪尔德林在15年后的持续时间分别为28%和31%.
- 技术DDT在17年后在土壤中残留了39%.
结论:
- 一些有机杀虫剂在土壤中具有很高的持久性,即使在17年后也会留下大量残留物.
- 该研究表明,这些发现代表了农药在土壤环境中持久性的上限.
- 这些遗留的农药对土壤的长期污染是一个重大的环境问题.
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