TY - JOUR
T1 - Zinc pollution in zones dominated by algae and submerged macrophytes in Lake Taihu
AU - Chen, Musong
AU - Wang, Dan
AU - Ding, Shiming
AU - Fan, Xianfang
AU - Jin, Zengfeng
AU - Wu, Yuexia
AU - Wang, Yan
AU - Zhang, Chaosheng
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/6/20
Y1 - 2019/6/20
N2 - Zinc (Zn) contamination in lake zones dominated by algae and macrophytes in Lake Taihu was analyzed through diffusive gradient in thin films (DGT) and dialysis (HR-Peeper) methods. It was found that in both zones Zn contamination varied by season. In July and October, dissolved Zn was present in high concentrations, and in July, high concentrations of labile Zn were found in sediments. In July, reductive dissolutions of Fe/Mn oxides likely played a key role in the release of Zn, which was confirmed by both zones having the lowest percentage of the reducible fraction of Zn in July. Complexation of dissolved organic matter (DOM) with Zn may be responsible for the observed increase in the dissolved Zn concentration in October. This conclusion was supported by noting that October had the highest percentages of Zn-DOM complexes (25.3% and 34.4%) in the algae- and macrophytes-dominated zones, respectively. However, in January, low dissolved and labile Zn contents were observed in sediments in the two zones, suggesting that the decrease of Zn in sediments was caused by the adsorption of Fe/Mn oxides.
AB - Zinc (Zn) contamination in lake zones dominated by algae and macrophytes in Lake Taihu was analyzed through diffusive gradient in thin films (DGT) and dialysis (HR-Peeper) methods. It was found that in both zones Zn contamination varied by season. In July and October, dissolved Zn was present in high concentrations, and in July, high concentrations of labile Zn were found in sediments. In July, reductive dissolutions of Fe/Mn oxides likely played a key role in the release of Zn, which was confirmed by both zones having the lowest percentage of the reducible fraction of Zn in July. Complexation of dissolved organic matter (DOM) with Zn may be responsible for the observed increase in the dissolved Zn concentration in October. This conclusion was supported by noting that October had the highest percentages of Zn-DOM complexes (25.3% and 34.4%) in the algae- and macrophytes-dominated zones, respectively. However, in January, low dissolved and labile Zn contents were observed in sediments in the two zones, suggesting that the decrease of Zn in sediments was caused by the adsorption of Fe/Mn oxides.
KW - Algal blooms
KW - High-resolution techniques
KW - Lake sediments
KW - Submerged macrophytes
KW - Zinc pollution
UR - https://www.scopus.com/pages/publications/85063099252
U2 - 10.1016/j.scitotenv.2019.03.167
DO - 10.1016/j.scitotenv.2019.03.167
M3 - Article
SN - 0048-9697
VL - 670
SP - 361
EP - 368
JO - Science of the Total Environment
JF - Science of the Total Environment
ER -
