School of Environmental Sciences, Mahatma Gandhi University, Kerala, India.
School of Environmental Sciences, Mahatma Gandhi University, Kerala, India; Institute for Climate Change Studies, Kottayam, 4, Kerala, India.
Mar Pollut Bull. 2018 Aug;133:294-303. doi: 10.1016/j.marpolbul.2018.05.033. Epub 2018 Jun 19.
The existence of Organochlorine pesticides (OCP's) and trace metals in tropical aquatic environments may cause a severe threat on account of their ubiquitous nature and long persistence. Monitoring of such contaminants has assumed immense significance in recent times. The present study assessed the OCP's and trace metal contamination in the surface sediments of the Vembanad wetland system in India. Various pollution indices were calculated to determine the sediment quality of the system and were also compared with uncontaminated sediments. Geo-accumulation index for Mercury varied from moderately to extremely polluted. The mean concentration of pesticide residues and trace metals in the sediments of Vembanad is found to be higher than in other aquatic systems in India. The situation demands further studies which focus on the potential bioaccumulation of OCPs and metals in the benthic food chain, succeeding biota and their impact on human consumption as the system supports a huge population for their livelihood. The Present study provides a baseline information on the spatial distribution of priority pollutants along with ecological risk status of Vembanad estuarine system (VES).
热带水生环境中有机氯农药 (OCP) 和痕量金属的存在可能构成严重威胁，因为它们无处不在且持久性长。因此，对这些污染物的监测变得非常重要。本研究评估了印度 Vembanad 湿地系统表层沉积物中的 OCP 和痕量金属污染。计算了各种污染指数来确定系统的沉积物质量，并与未受污染的沉积物进行了比较。汞的地质累积指数从中度到极度污染不等。Vembanad 沉积物中农药残留和痕量金属的平均浓度高于印度其他水系统。这种情况需要进一步研究，重点关注 OCP 和金属在底栖食物链、后续生物群和人类消费中的潜在生物累积，因为该系统为其生计支持着大量人口。本研究提供了关于优先污染物沿 Vembanad 河口系统 (VES) 空间分布以及生态风险状况的基线信息。
