3 years ago

Using Isomeric and Metabolic Ratios of DDT To Identify the Sources and Fate of DDT in Chinese Agricultural Topsoil

Isomeric and Metabolic Ratios of DDT To Identify
the Sources and Fate of DDT in Chinese Agricultural Topsoil
managing.editor@est.acs.org (American Chemical Society)
The metabolic ratio of (p,p′-DDE + p,p′-DDD)/p,p′-DDT or p,p′-DDE/p,p′-DDT has been used previously to estimate the approximate half-life of p,p′-DDT, with a relatively unclear concept of “old” and “new” sources of p,p′-DDT and without paying attention to the influence by dicofol-type DDT contributed from the more recent usage of dicofol. Based on the isomeric ratio of o,p′-DDT/p,p′-DDT to distinguish the sources of DDT, this study used the corrected metabolic ratio of (p,p′-DDE + p,p′-DDD)/p,p′-DDT to estimate a more accurate half-life of p,p′-DDT using a model-based approach. This indicates the average half-life of p,p′-DDT in Chinese topsoils was 14.2 ± 0.9 years with dicofol-type DDT input considered. In deeper soil, the half-life was >30 years and the metabolic pathway of p,p′-DDT was significantly different with topsoil’s. Further analysis on the fraction of DDT from technical DDT suggested that a region that had been sprayed with technical DDT was likely to have been sprayed with dicofol as well, but the monitoring residues of DDT in topsoil mainly derive from historical use of technical DDT.

Publisher URL: http://dx.doi.org/10.1021/acs.est.7b05877

DOI: 10.1021/acs.est.7b05877

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.