[Pollution Characteristics and Ecological Risk Assessment of PAHs in Water and Fishes from Daqing Lakes].

The concentrations of 16 polycyclic aromatic hydrocarbons (PAHs) in 30 water samples and 5 tissues (gill, liver, brain, kidney and muscle) of 36 fishes which were collected from 18 typical lakes of the Daqing lakes group, China were measured between February and April 2012. The results of PAHs concentrations in the water showed that the range of total concentrations was 0.2-1.

[Vertical Distribution Characteristics and Analysis in Sediments of Xidahai Lake].

The organic matter (OM), total nitrogen (TN), total phosphorus (TP), the morphological changes of phosphorus and the particle size in columnar sediment core of Xidahai Lake were analyzed, to discuss the vertical distribution characteristics and influencing factors. The results showed that the contents of OM, TN and TP were 0. 633% -2.

[Evolvement and pollution of heavy metals in core sediments from Yamenqi Lake in Lianhuan Lake, China].

One sediment core was obtained from the center of Yamenqi Lake at the Songnen Plain in eastern China in August 2010 using a gravity corer. The sediment samples were digested using HNO3-HClO4-HF. Concentrations of the metals Cr, Cu, Mn, Ni, Fe, Pb, Zn, Cd, Al, Ba, Ca, K, Li, Mg, Na and Sr were determined using inductively coupled plasma-mass spectrometry (ICP-MS).

[Distribution and potential ecological risk assessment of heavy metals in sediments of Zhalong Wetland].

This study investigated the concentrations of heavy metals in the sediments of the Zhalong Wetland using ICP-MS, analyzed their spatial distributions, evaluated the potential ecological risk, and explored the pollution sources and environmental influencing factors. The results can be summarized as the followings: (1) The concentrations of Hg, Cd, As, Cu, Pb, Zn and Cr were 0.065, 0.

[Character and sources identification of heavy metals contamination in sediment from the core sediment in Nanshan Lake, the Zhalong wetland].

NSH2 sediment core from Nanshan Lake in the south of Zhalong wetland was studied, which was a typical lake for both empolder and aquaculture. The vertical distributions of heavy metals (Hg, Cd, Pb, Cr, As, Mn, Ag, Cu, Co, Fe and Zn) were investigated. The method of principal component analysis (PCA) was adopted to apportion the sources of heavy metals, and particle size, combined with 210Pb(ex) dating data were used to indicate characteristics, sources and polluted history of heavy metals in lake sediments since 1829.