Cyanobacteria and their toxins in Guanting Reservoir of Beijing, China

Abstract

The present study investigated the cyanobacteria and one family of their toxins-microcystins (MCs) in Guanting Reservoir of Beijing, China. The dominant species in the cyanobacteria found in August and September of 2006 was Microcystis, which accounted 99% of total algal cells. The specific species of the Microcystis in the cyanobacteria included Microcystis ichthyobalbe, Microcystis novacekii, Microcystis botrys and Microcystis aeruginosa which had different ratios in different sites. The qualitative analysis by HPLC showed that two microcystins were contained in cyanobacteria and one microcystin was in water of the reservoir. The major microcystins were microcystin-RR (MC-RR) and microcystin-LR (MC-LR), but only MC-LR was detected in water. The quantitative analysis by HPLC indicated that the maximum concentrations of MC-RR and MC-LR contained in cyanobacteria were 0.74 and 0.41 mg/g dry weight, respectively. The maximum microcystin concentration in water was 1.15 g/L and others were below 1 g/L.

Thyroid hormone disrupting activities of sediment from the Guanting Reservoir, Beijing, China

“…The sediment organic extracts in GR1, GR3 and GR6 exerted a higher TR antagonism than that of the other samples, possibly because of the input from the rivers and the transportation of TDCs in the sediment. The TR disrupting effect of GR1 was reflected in the condition of the Yongding River, which has been reported to harbor over 80% of the pollutants eventually observed in the Guanting Reservoir [25]. Some TDCs, including PAEs, endocrine-disrupting pesticides and PCBs, have been detected in the Yongding River at high concentrations [26].…”

Identification of Thyroid-Receptor Antagonists in Water from the Guanting Reservoir, Beijing, China

“…Yongding River and Guishui River have extensive pollution due to runoff from nonpoint sources, direct waste dumping, unmanaged fishing, mineral exploitation, etc. (Dai et al 2008). The pollutants are carried by the rivers and inputted in the reservoir (Xue et al 2005).…”

“…The pollutants are carried by the rivers and inputted in the reservoir (Xue et al 2005). Especially, the Yongding River has been reported to harbor [80 % the pollutants eventually observed in the Guanting Reservoir (Dai et al 2008). The GR2 site was at the estuary of the Guishui River, and its water quality was affected by such.…”

Fast removal of cyanobacterial toxin microcystin-LR by a low-cytotoxic microgel-Fe(Ⅲ) complex

“…As shown in Table 3, below the level 14.7 mg/L, MC-LR was removed successfully by filtration with high removal efficiency and the MC-LR concentration in the output water was below the WHO guideline value. In most cases for drinking water pollution by MC in China (Dai et al, 2008;Song et al, 2007), the MC concentration was below this level and our microgel-Fe(Ⅲ) membrane filtration technology was reliable for safe drinking water. This was confirmed by our membrane filtration experiment using water samples collected from lakes or ponds suffered in severe cyanobacteria bloom in different areas of China.…”