Carbaryl residue concentrations, degradation, and major sinks in the Seto Inland Sea, Japan

Derbalah Aly

Chidya Russel

Kaonga Chikumbusko

Iwamoto Yoko

Takeda Kazuhiko

Sakugawa Hiroshi

Environmental Science and Pollution Research

The fate of carbaryl in the Seto Inland Sea (west Japan) was predicted using a mass distribution model using carbaryl concentrations in river and sea water samples, degradation data, and published data. The predicted carbaryl concentrations in water in Kurose River and the Seto Inland Sea were 4.320 and 0.2134 μg/L, respectively, and the predicted concentrations in plankton, fish, and sediment were 0.4140, 2.436, and 1.851 μg/g dry weight, respectively. The carbaryl photodegradation and biodegradation rates were higher for river water (0.330 and 0.029 day−1, respectively) than sea water (0.23 and 0.001 day−1, respectively). The carbaryl photodegradation rates for river and sea water (0.33 and 0.23 day−1, respectively) were higher than the biodegradation rates (0.029 and 0.001 day−1, respectively). The hydrolysis degradation rate for carbaryl in sea water was 0.003 day−1, and the half-life was 231 days. Land (via rivers) was the main source of carbaryl to the Seto Inland Sea. The model confirmed carbaryl is distributed between sediment, plankton, and fish in the Seto Inland Sea. Degradation, loss to the Open Ocean, and sedimentation are the main carbaryl sinks in the Seto Inland Sea, accounting for 43.81, 27.90, and 17.68%, respectively, of total carbaryl inputs. Carbaryl source and sink data produced by the model could help in the management of the negative impacts of carbaryl on aquatic systems and human health.

Aquatic system

Distribution

Insecticide

Mass balance

Sediment

Water

eng

Environmental Science and Pollution Research

This is a post-peer-review, pre-copyedit version of an article published in Environmental Science and Pollution Research. The final authenticated version is available online at: https://doi.org/10.1007/s11356-020-08010-0

This is not the published version. Please cite only the published version. この論文は出版社版ではありません。引用の際には出版社版をご確認、ご利用ください。

[ISSN] 0944-1344

[ISSN] 1614-7499

[DOI] 10.1007/s11356-020-08010-0

[DOI] https://doi.org/10.1007/s11356-020-08010-0