Distribution of atrazine and its phytoremediation by submerged macrophytes in lake sediments. (February 2017)

• Record Type: Journal Article
• Authors: Qu, Mengjie; Li, Huidong; Li, Na; Liu, Guanglong; Zhao, Jianwei; Hua, Yumei; Zhu, Duanwei
• Is Part Of: Chemosphere. Volume 168(2017)
• Page Start: 1515
• Page End: 1522
• Publication Date: 2017-02
• Subjects: Atrazine -- Sediment -- Distribution -- Submerged macrophytes -- Phytoremediation; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2016.11.164
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: We investigated sediments with high atrazine accumulation capability from 6 eutrophic lakes in Hubei Province of central China. Almost all lakes have atrazine in their sediments because of human activities. Honghu Lake and Liangzihu Lake were found to have higher levels of atrazine in sediment: 0.171 and 0.114 mg kg −1, respectively. The results showed that lake sediments could adsorb atrazine six times faster than soils. The equilibrium partition coefficient of atrazine desorption ( K Pd ) is much larger than the adsorption equilibrium partition coefficient ( K Pa ) of atrazine, indicating that the residue of atrazine in water is easily immobilized by the sediments. Meanwhile, the incubation experiment showed that the removal rateof atrazine in Potamogeton crispus -planted and Myriophyllum spicatum -planted sediments reached >90%, while the rate in unplanted sediments was 77.2 ± 2.12% over 45 d. In unplanted sediment, the half-life of atrazine dissipation was 14.30 d, which was strongly enhanced by P. crispus and M. spicatum, greatly reducing the half-life to 8.60 and 9.72 d, respectively. These two submerged macrophytes are considered to be potential tools in the remediation of atrazine-contaminated sediments. Graphical abstract: Highlights: Occurrence of atrazine in lake sediments in central China for the first time. Lake sediments can adsorb atrazine at a faster speed than soils. The residue of atrazine in water is easily immoblized by the sediments. P. crispus and M. spicatum can remove atrazine in sediment effectively.