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首页> 外文会议>International Conference on Groundwater Research, Jun 6-8, 2000, Copenhagen, Denmark >Diffusive emitters for field investigations of the fate of the herbicides 2,4,5-T, atrazine, and DNOC in a shallow, anaerobic aquifer, Tisvilde Hegn, Denmark
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Diffusive emitters for field investigations of the fate of the herbicides 2,4,5-T, atrazine, and DNOC in a shallow, anaerobic aquifer, Tisvilde Hegn, Denmark

机译：用于田间调查浅水厌氧含水层中除草剂2,4,5-T，阿特拉津和DNOC的扩散发射体，丹麦蒂斯维德·黑格

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摘要

The fate of the 3 formerly widely used herbicides 2,4,5-T, atrazine, and DNOC in a shallow anaerobic aquifer was investigated by use of diffusive emitters capable of releasing reasonably stable concentrations of each herbicide along with a tracer (HTO). Degradation of 2,4,5-T and atrazine could not be detected within a residence time of ～9 days. In contrast, DNOC was below detection limit after ～3.6 days showing rapid abiotic degradation. The degradation pathway is assumed to be reduction of nitro groups. In comparison, results from batch laboratory experiments revealed slow microbial degradation (half-life ～200 d) of 2,4,5-T in sediment taken from the upper part of the experiment depth. Atrazine was found to be persistent in the laboratory experiments also. DNOC was below detection limit after 50 d. The results demonstrate the ability of the system to detect rapid degradation, whereas detection of slow degradation requires identification of degradation products.
机译：通过使用能够释放相当稳定浓度的每种除草剂和示踪剂（HTO）的扩散发射器，研究了浅厌氧含水层中3种先前广泛使用的除草剂2,4,5-T，at去津和DNOC的命运。在约9天的停留时间内无法检测到2,4,5-T和阿特拉津的降解。相比之下，约3.6天后DNOC低于检测极限，显示出快速的非生物降解。假定降解途径是硝基的还原。相比之下，分批实验室实验的结果表明，从实验深度的上部获取的沉积物中2,4,5-T的微生物降解缓慢（半衰期〜200 d）。还发现r去津在实验室实验中也具有持久性。 50天后DNOC低于检测极限。结果表明系统具有检测快速降解的能力，而检测缓慢降解则需要鉴定降解产物。

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