Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 436, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.129178
Keywords
Dioxins; DL-PCBs; Chinese mitten crab; Transfer route; Bioaccumulation
Categories
Funding
- Shanghai Agriculture Applied Technology Development Program, China [2022-010]
- Outstanding team of Shanghai Academy of Agricul-tural Sciences
Ask authors/readers for more resources
This study investigated the accumulation of dioxins and DL-PCBs in farmed Chinese mitten crabs. The results showed that these pollutants were commonly found in farmed crabs but did not pose a health risk to consumers. Snails were found to play a crucial role in the accumulation of dioxins in crabs, providing important insights for preventing and reducing contamination by dioxins and DL-PCBs in crabs.
Dioxins and dioxin-like polychlorinated biphenyls (DL-PCBs) transfer and accumulation behavior remains poorly understood in the farmed Chinese mitten crab (Eriocheir sinensis). In this study, dioxins and DL-PCBs concentration in 48 farming crabs in lower reaches of the Yangtze River was monitored and controlled field design was conducted in a typical farm to dissect the dioxins and DL-PCBs contamination in crab food web (crab, feeds, and environment). Results showed that dioxins and DL-PCBs were ubiquitous in farmed crabs with concentrations ranging from 0.390 to 37.2 pg toxic equivalents (TEQ) g(-1) ww and do not present a health risk to general consumers. Of the total dioxins TEQ found in crab in treated farms, 45.6% was attributed to direct transfer from the aquaculture environment and 46.5% to the consumption of snails. Consumption of feed material accounted for nearly all of the total DL-PCBs TEQ, divided as 58.2% from feed and 41.8% from snails. These results demonstrated that dominant routes of dioxins accumulation in crabs were transferred for the sediment-snail-crab and sediment-crab chains, whereas DL-PCBs is mainly transferred through consumption of feeds and snails. To our knowledge, this work is the first report of snails serving as a biomagnification medium that promotes accumulation of dioxins in mitten crabs. This observation provided crucial insight to prevent and reduce contamination of crab by dioxins and DL-PCBs.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available