期刊
TOXICOLOGY REPORTS
卷 8, 期 -, 页码 1754-1761出版社
ELSEVIER
DOI: 10.1016/j.toxrep.2021.10.006
关键词
3,4-DCA; Emerging pollutants; Comparative ecotoxicity; Embryotoxicity; Cardiotoxicity
类别
资金
- Research Council of Norway [280511, 223254]
The study revealed that Atlantic cod embryos are more sensitive to acute exposure to 3,4-DCA, potentially leading to delayed and concentration-dependent effects on surviving larvae even at low concentrations. This suggests potential long-term effects of transient embryonic exposure to low concentrations of 3,4-DCA.
3,4-dichloroaniline (3,4-DCA) is one of the most widely produced anilines world-wide, used in plastic packaging, fabrics, pharmaceuticals, pesticides, dyes and paints as well as being a degradation product of several pesticides. 3,4-DCA has been detected in freshwater, brackish and marine environments. Although freshwater toxicity thresholds exist, very little toxicological information is available on marine and cold-water species. In this study, we exposed Atlantic cod (Gadus morhua) embryos (3-7 days post fertilization) to 3,4-DCA concentrations ranging from 8-747 mu g/L for 4 days followed by a recovery period in clean sea water until 14 days post fertilization (dpf). The cod embryos were significantly more sensitive to acute 3,4-DCA exposure compared to other species tested and reported in the literature. At the highest concentration (747 mu g/L), no embryos survived until hatch, and even at the lowest concentration (8 mu g/L), a small, but significant increase in mortality was observed at 14 dpf. Delayed and concentration-dependent effects on surviving yolk-sac larvae, manifested as cardiac, developmental and morphometric alterations, more than a week after exposure suggest potential long-term effects of transient embryonic exposure to low concentrations of 3,4-DCA.
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