Concentration Levels and Regional Distributions of Systemic Insecticides and Their Metabolites in the Lake Hachiro Basin, Akita

DOI Web Site 1 Citations 14 References

Bibliographic Information

Other Title
  • 秋田県八郎湖流域における浸透移行性殺虫剤と代謝物の濃度レベルと水平分布

Abstract

<p>The first basin-scale survey of concentration levels and regional distributions of major systemic insecticides and their metabolites were conducted in the Lake Hachiro Basin in Akita Prefecture in June and August 2020. Dinotefuran, imidacloprid, thiacloprid, thiamethoxam, clothianidin, ethiprole, fipronil, and thiacloprid amide were detected in the tested samples. The highest detection frequencies of dinotefuran and thiacloprid amide were respectively observed in August (100%) and June (80%) . Such trends seem to be affected by the rice production and productivity in the basin. The highest concentration among the parent pesticides was dinotefuran at 2,200 ng L-1 detected from Lake Hachiro in August and those in metabolites were thiacroprid amide at 60 ng L-1 detected from tributaries in June. Dinotefuran was widely detected from the Lake Hachiro Basin, and its concentration was 1–3 orders of magnitude higher than those of other pesticides. The ecotoxicological risk assessment value (maximum measured environmental concentration/ predicted no effect concentration, MECmax/PNEC) , which was calculated using the PNEC value estimated as the acute toxicity test value of a highly sensitive species (Chironomus yoshimatsui) to dinotefuran was greater than 1. However, the environmental behavior and fate of target pesticides during all seasons were unknown in this study. Further detailed studies are required in the Lake Hachiro Basin.</p>

Journal

Citations (1)*help

See more

References(14)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top